ClassUtils (Apache Commons Lang 3.8 API)

java.lang.Object
- org.apache.commons.lang3.ClassUtils

```
public class ClassUtils
extends Object
```
Operates on classes without using reflection.

This class handles invalid null inputs as best it can. Each method documents its behaviour in more detail.

The notion of a canonical name includes the human readable name for the type, for example int[]. The non-canonical method variants work with the JVM names, such as [I.

Since:

2.0

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class ClassUtils.Interfaces
Inclusivity literals for hierarchy(Class, Interfaces).

Nested Classes
Modifier and Type	Class and Description
`static class`	`ClassUtils.Interfaces` Inclusivity literals for `hierarchy(Class, Interfaces)`.

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`INNER_CLASS_SEPARATOR` The inner class separator String: `"$"`.
`static char`	`INNER_CLASS_SEPARATOR_CHAR` The inner class separator character: `'$' == 36`.
`static String`	`PACKAGE_SEPARATOR` The package separator String: `"."`.
`static char`	`PACKAGE_SEPARATOR_CHAR` The package separator character: `'.' == 46`.

Constructor Summary

Constructors
Constructor and Description

ClassUtils()
ClassUtils instances should NOT be constructed in standard programming.

Constructors
Constructor and Description
`ClassUtils()` ClassUtils instances should NOT be constructed in standard programming.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static List<String>`	`convertClassesToClassNames(List<Class<?>> classes)` Given a `List` of `Class` objects, this method converts them into class names.
`static List<Class<?>>`	`convertClassNamesToClasses(List<String> classNames)` Given a `List` of class names, this method converts them into classes.
`static String`	`getAbbreviatedName(Class<?> cls, int len)` Gets the abbreviated name of a `Class`.
`static String`	`getAbbreviatedName(String className, int len)` Gets the abbreviated class name from a `String`.
`static List<Class<?>>`	`getAllInterfaces(Class<?> cls)` Gets a `List` of all interfaces implemented by the given class and its superclasses.
`static List<Class<?>>`	`getAllSuperclasses(Class<?> cls)` Gets a `List` of superclasses for the given class.
`static String`	`getCanonicalName(Class<?> cls)` Gets the canonical class name for a `Class`.
`static String`	`getCanonicalName(Class<?> cls, String valueIfNull)` Gets the canonical name for a `Class`.
`static String`	`getCanonicalName(Object object)` Gets the canonical name for an `Object`.
`static String`	`getCanonicalName(Object object, String valueIfNull)` Gets the canonical name for an `Object`.
`static Class<?>`	`getClass(ClassLoader classLoader, String className)` Returns the (initialized) class represented by `className` using the `classLoader`.
`static Class<?>`	`getClass(ClassLoader classLoader, String className, boolean initialize)` Returns the class represented by `className` using the `classLoader`.
`static Class<?>`	`getClass(String className)` Returns the (initialized) class represented by `className` using the current thread's context class loader.
`static Class<?>`	`getClass(String className, boolean initialize)` Returns the class represented by `className` using the current thread's context class loader.
`static String`	`getName(Class<?> cls)` Null-safe version of `Class.getName()`
`static String`	`getName(Class<?> cls, String valueIfNull)` Null-safe version of `aClass.getName()`
`static String`	`getName(Object object)` Null-safe version of `Class.getName()`
`static String`	`getName(Object object, String valueIfNull)` Null-safe version of `aClass.getSimpleName()`
`static String`	`getPackageCanonicalName(Class<?> cls)` Gets the package name from the canonical name of a `Class`.
`static String`	`getPackageCanonicalName(Object object, String valueIfNull)` Gets the package name from the canonical name of an `Object`.
`static String`	`getPackageCanonicalName(String canonicalName)` Gets the package name from the canonical name.
`static String`	`getPackageName(Class<?> cls)` Gets the package name of a `Class`.
`static String`	`getPackageName(Object object, String valueIfNull)` Gets the package name of an `Object`.
`static String`	`getPackageName(String className)` Gets the package name from a `String`.
`static Method`	`getPublicMethod(Class<?> cls, String methodName, Class<?>... parameterTypes)` Returns the desired Method much like `Class.getMethod`, however it ensures that the returned Method is from a public class or interface and not from an anonymous inner class.
`static String`	`getShortCanonicalName(Class<?> cls)` Gets the canonical name minus the package name from a `Class`.
`static String`	`getShortCanonicalName(Object object, String valueIfNull)` Gets the canonical name minus the package name for an `Object`.
`static String`	`getShortCanonicalName(String canonicalName)` Gets the canonical name minus the package name from a String.
`static String`	`getShortClassName(Class<?> cls)` Gets the class name minus the package name from a `Class`.
`static String`	`getShortClassName(Object object, String valueIfNull)` Gets the class name minus the package name for an `Object`.
`static String`	`getShortClassName(String className)` Gets the class name minus the package name from a String.
`static String`	`getSimpleName(Class<?> cls)` Null-safe version of `aClass.getSimpleName()`
`static String`	`getSimpleName(Class<?> cls, String valueIfNull)` Null-safe version of `aClass.getSimpleName()`
`static String`	`getSimpleName(Object object)` Null-safe version of `aClass.getSimpleName()`
`static String`	`getSimpleName(Object object, String valueIfNull)` Null-safe version of `aClass.getSimpleName()`
`static Iterable<Class<?>>`	`hierarchy(Class<?> type)` Get an `Iterable` that can iterate over a class hierarchy in ascending (subclass to superclass) order, excluding interfaces.
`static Iterable<Class<?>>`	`hierarchy(Class<?> type, ClassUtils.Interfaces interfacesBehavior)` Get an `Iterable` that can iterate over a class hierarchy in ascending (subclass to superclass) order.
`static boolean`	`isAssignable(Class<?>[] classArray, Class<?>... toClassArray)` Checks if an array of Classes can be assigned to another array of Classes.
`static boolean`	`isAssignable(Class<?>[] classArray, Class<?>[] toClassArray, boolean autoboxing)` Checks if an array of Classes can be assigned to another array of Classes.
`static boolean`	`isAssignable(Class<?> cls, Class<?> toClass)` Checks if one `Class` can be assigned to a variable of another `Class`.
`static boolean`	`isAssignable(Class<?> cls, Class<?> toClass, boolean autoboxing)` Checks if one `Class` can be assigned to a variable of another `Class`.
`static boolean`	`isInnerClass(Class<?> cls)` Is the specified class an inner class or static nested class.
`static boolean`	`isPrimitiveOrWrapper(Class<?> type)` Returns whether the given `type` is a primitive or primitive wrapper (`Boolean`, `Byte`, `Character`, `Short`, `Integer`, `Long`, `Double`, `Float`).
`static boolean`	`isPrimitiveWrapper(Class<?> type)` Returns whether the given `type` is a primitive wrapper (`Boolean`, `Byte`, `Character`, `Short`, `Integer`, `Long`, `Double`, `Float`).
`static Class<?>[]`	`primitivesToWrappers(Class<?>... classes)` Converts the specified array of primitive Class objects to an array of its corresponding wrapper Class objects.
`static Class<?>`	`primitiveToWrapper(Class<?> cls)` Converts the specified primitive Class object to its corresponding wrapper Class object.
`static Class<?>[]`	`toClass(Object... array)` Converts an array of `Object` in to an array of `Class` objects.
`static Class<?>[]`	`wrappersToPrimitives(Class<?>... classes)` Converts the specified array of wrapper Class objects to an array of its corresponding primitive Class objects.
`static Class<?>`	`wrapperToPrimitive(Class<?> cls)` Converts the specified wrapper class to its corresponding primitive class.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - PACKAGE_SEPARATOR_CHAR
```
public static final char PACKAGE_SEPARATOR_CHAR
```
    The package separator character: '.' == 46.
    
    See Also:
    
    Constant Field Values
  - PACKAGE_SEPARATOR
```
public static final String PACKAGE_SEPARATOR
```
    The package separator String: ".".
  - INNER_CLASS_SEPARATOR_CHAR
```
public static final char INNER_CLASS_SEPARATOR_CHAR
```
    The inner class separator character: '$' == 36.
    
    See Also:
    
    Constant Field Values
  - INNER_CLASS_SEPARATOR
```
public static final String INNER_CLASS_SEPARATOR
```
    The inner class separator String: "$".
- Constructor Detail
  - ClassUtils
```
public ClassUtils()
```
    ClassUtils instances should NOT be constructed in standard programming. Instead, the class should be used as ClassUtils.getShortClassName(cls).
    
    This constructor is public to permit tools that require a JavaBean instance to operate.
- Method Detail
  - getShortClassName
```
public static String getShortClassName(Object object,
                                       String valueIfNull)
```
    Gets the class name minus the package name for an Object.
    
    Parameters:
    
    object - the class to get the short name for, may be null
    
    valueIfNull - the value to return if null
    
    Returns:
    
    the class name of the object without the package name, or the null value
  - getShortClassName
```
public static String getShortClassName(Class<?> cls)
```
    Gets the class name minus the package name from a Class.
    
    Consider using the Java 5 API Class.getSimpleName() instead. The one known difference is that this code will return "Map.Entry" while the java.lang.Class variant will simply return "Entry".
    
    Parameters:
    
    cls - the class to get the short name for.
    
    Returns:
    
    the class name without the package name or an empty string
  - getShortClassName
```
public static String getShortClassName(String className)
```
    Gets the class name minus the package name from a String.
    
    The string passed in is assumed to be a class name - it is not checked.
    
    Note that this method differs from Class.getSimpleName() in that this will return "Map.Entry" whilst the java.lang.Class variant will simply return "Entry".
    
    Parameters:
    
    className - the className to get the short name for
    
    Returns:
    
    the class name of the class without the package name or an empty string
  - getSimpleName
```
public static String getSimpleName(Class<?> cls)
```
    Null-safe version of aClass.getSimpleName()
    
    Parameters:
    
    cls - the class for which to get the simple name; may be null
    
    Returns:
    
    the simple class name.
    
    Since:
    
    3.0
    
    See Also:
    
    Class.getSimpleName()
  - getSimpleName
```
public static String getSimpleName(Class<?> cls,
                                   String valueIfNull)
```
    Null-safe version of aClass.getSimpleName()
    
    Parameters:
    
    cls - the class for which to get the simple name; may be null
    
    valueIfNull - the value to return if null
    
    Returns:
    
    the simple class name or valueIfNull
    
    Since:
    
    3.0
    
    See Also:
    
    Class.getSimpleName()
  - getSimpleName
```
public static String getSimpleName(Object object)
```
    Null-safe version of aClass.getSimpleName()
    
    Parameters:
    
    object - the object for which to get the simple class name; may be null
    
    Returns:
    
    the simple class name or the empty String
    
    Since:
    
    3.7
    
    See Also:
    
    Class.getSimpleName()
  - getSimpleName
```
public static String getSimpleName(Object object,
                                   String valueIfNull)
```
    Null-safe version of aClass.getSimpleName()
    
    Parameters:
    
    object - the object for which to get the simple class name; may be null
    
    valueIfNull - the value to return if object is null
    
    Returns:
    
    the simple class name or valueIfNull
    
    Since:
    
    3.0
    
    See Also:
    
    Class.getSimpleName()
  - getName
```
public static String getName(Class<?> cls)
```
    Null-safe version of Class.getName()
    
    Parameters:
    
    cls - the class for which to get the class name; may be null
    
    Returns:
    
    the class name or the empty String.
    
    Since:
    
    3.7
    
    See Also:
    
    Class.getSimpleName()
  - getName
```
public static String getName(Class<?> cls,
                             String valueIfNull)
```
    Null-safe version of aClass.getName()
    
    Parameters:
    
    cls - the class for which to get the class name; may be null
    
    valueIfNull - the return value if cls is null
    
    Returns:
    
    the class name or valueIfNull
    
    Since:
    
    3.7
    
    See Also:
    
    Class.getName()
  - getName
```
public static String getName(Object object)
```
    Null-safe version of Class.getName()
    
    Parameters:
    
    object - the object for which to get the class name; may be null
    
    Returns:
    
    the class name or the empty String
    
    Since:
    
    3.7
    
    See Also:
    
    Class.getSimpleName()
  - getName
```
public static String getName(Object object,
                             String valueIfNull)
```
    Null-safe version of aClass.getSimpleName()
    
    Parameters:
    
    object - the object for which to get the class name; may be null
    
    valueIfNull - the value to return if object is null
    
    Returns:
    
    the class name or valueIfNull
    
    Since:
    
    3.0
    
    See Also:
    
    Class.getName()
  - getPackageName
```
public static String getPackageName(Object object,
                                    String valueIfNull)
```
    Gets the package name of an Object.
    
    Parameters:
    
    object - the class to get the package name for, may be null
    
    valueIfNull - the value to return if null
    
    Returns:
    
    the package name of the object, or the null value
  - getPackageName
```
public static String getPackageName(Class<?> cls)
```
    Gets the package name of a Class.
    
    Parameters:
    
    cls - the class to get the package name for, may be null.
    
    Returns:
    
    the package name or an empty string
  - getPackageName
```
public static String getPackageName(String className)
```
    Gets the package name from a String.
    
    The string passed in is assumed to be a class name - it is not checked.
    
    If the class is unpackaged, return an empty string.
    
    Parameters:
    
    className - the className to get the package name for, may be null
    
    Returns:
    
    the package name or an empty string
  - getAbbreviatedName
```
public static String getAbbreviatedName(Class<?> cls,
                                        int len)
```
    Gets the abbreviated name of a Class.
    
    Parameters:
    
    cls - the class to get the abbreviated name for, may be null
    
    len - the desired length of the abbreviated name
    
    Returns:
    
    the abbreviated name or an empty string
    
    Throws:
    
    IllegalArgumentException - if len <= 0
    
    Since:
    
    3.4
    
    See Also:
    
    getAbbreviatedName(String, int)
  - getAbbreviatedName
```
public static String getAbbreviatedName(String className,
                                        int len)
```
    Gets the abbreviated class name from a String.
    
    The string passed in is assumed to be a class name - it is not checked.
    
    The abbreviation algorithm will shorten the class name, usually without significant loss of meaning.
    
    The abbreviated class name will always include the complete package hierarchy. If enough space is available, rightmost sub-packages will be displayed in full length.
    
    Examples
    className len return
    
    null 1 ""
    
    "java.lang.String" 5 "j.l.String"
    
    "java.lang.String" 15 "j.lang.String"
    
    "java.lang.String" 30 "java.lang.String"
    
    Parameters:
    
    className - the className to get the abbreviated name for, may be null
    
    len - the desired length of the abbreviated name
    
    Returns:
    
    the abbreviated name or an empty string
    
    Throws:
    
    IllegalArgumentException - if len <= 0
    
    Since:
    
    3.4
  - getAllSuperclasses
```
public static List<Class<?>> getAllSuperclasses(Class<?> cls)
```
    Gets a List of superclasses for the given class.
    
    Parameters:
    
    cls - the class to look up, may be null
    
    Returns:
    
    the List of superclasses in order going up from this one null if null input
  - getAllInterfaces
```
public static List<Class<?>> getAllInterfaces(Class<?> cls)
```
    Gets a List of all interfaces implemented by the given class and its superclasses.
    
    The order is determined by looking through each interface in turn as declared in the source file and following its hierarchy up. Then each superclass is considered in the same way. Later duplicates are ignored, so the order is maintained.
    
    Parameters:
    
    cls - the class to look up, may be null
    
    Returns:
    
    the List of interfaces in order, null if null input
  - convertClassNamesToClasses
```
public static List<Class<?>> convertClassNamesToClasses(List<String> classNames)
```
    Given a List of class names, this method converts them into classes.
    
    A new List is returned. If the class name cannot be found, null is stored in the List. If the class name in the List is null, null is stored in the output List.
    
    Parameters:
    
    classNames - the classNames to change
    
    Returns:
    
    a List of Class objects corresponding to the class names, null if null input
    
    Throws:
    
    ClassCastException - if classNames contains a non String entry
  - convertClassesToClassNames
```
public static List<String> convertClassesToClassNames(List<Class<?>> classes)
```
    Given a List of Class objects, this method converts them into class names.
    
    A new List is returned. null objects will be copied into the returned list as null.
    
    Parameters:
    
    classes - the classes to change
    
    Returns:
    
    a List of class names corresponding to the Class objects, null if null input
    
    Throws:
    
    ClassCastException - if classes contains a non-Class entry
  - isAssignable
```
public static boolean isAssignable(Class<?>[] classArray,
                                   Class<?>... toClassArray)
```
    Checks if an array of Classes can be assigned to another array of Classes.
    
    This method calls isAssignable for each Class pair in the input arrays. It can be used to check if a set of arguments (the first parameter) are suitably compatible with a set of method parameter types (the second parameter).
    
    Unlike the Class.isAssignableFrom(java.lang.Class) method, this method takes into account widenings of primitive classes and nulls.
    
    Primitive widenings allow an int to be assigned to a long, float or double. This method returns the correct result for these cases.
    
    Null may be assigned to any reference type. This method will return true if null is passed in and the toClass is non-primitive.
    
    Specifically, this method tests whether the type represented by the specified Class parameter can be converted to the type represented by this Class object via an identity conversion widening primitive or widening reference conversion. See The Java Language Specification, sections 5.1.1, 5.1.2 and 5.1.4 for details.
    
    Since Lang 3.0, this method will default behavior for calculating assignability between primitive and wrapper types corresponding to the running Java version; i.e. autoboxing will be the default behavior in VMs running Java versions > 1.5.
    
    Parameters:
    
    classArray - the array of Classes to check, may be null
    
    toClassArray - the array of Classes to try to assign into, may be null
    
    Returns:
    
    true if assignment possible
  - isAssignable
```
public static boolean isAssignable(Class<?>[] classArray,
                                   Class<?>[] toClassArray,
                                   boolean autoboxing)
```
    Checks if an array of Classes can be assigned to another array of Classes.
    
    This method calls isAssignable for each Class pair in the input arrays. It can be used to check if a set of arguments (the first parameter) are suitably compatible with a set of method parameter types (the second parameter).
    
    Unlike the Class.isAssignableFrom(java.lang.Class) method, this method takes into account widenings of primitive classes and nulls.
    
    Primitive widenings allow an int to be assigned to a long, float or double. This method returns the correct result for these cases.
    
    Null may be assigned to any reference type. This method will return true if null is passed in and the toClass is non-primitive.
    
    Specifically, this method tests whether the type represented by the specified Class parameter can be converted to the type represented by this Class object via an identity conversion widening primitive or widening reference conversion. See The Java Language Specification, sections 5.1.1, 5.1.2 and 5.1.4 for details.
    
    Parameters:
    
    classArray - the array of Classes to check, may be null
    
    toClassArray - the array of Classes to try to assign into, may be null
    
    autoboxing - whether to use implicit autoboxing/unboxing between primitives and wrappers
    
    Returns:
    
    true if assignment possible
  - isPrimitiveOrWrapper
```
public static boolean isPrimitiveOrWrapper(Class<?> type)
```
    Returns whether the given type is a primitive or primitive wrapper (Boolean, Byte, Character, Short, Integer, Long, Double, Float).
    
    Parameters:
    
    type - The class to query or null.
    
    Returns:
    
    true if the given type is a primitive or primitive wrapper (Boolean, Byte, Character, Short, Integer, Long, Double, Float).
    
    Since:
    
    3.1
  - isPrimitiveWrapper
```
public static boolean isPrimitiveWrapper(Class<?> type)
```
    Returns whether the given type is a primitive wrapper (Boolean, Byte, Character, Short, Integer, Long, Double, Float).
    
    Parameters:
    
    type - The class to query or null.
    
    Returns:
    
    true if the given type is a primitive wrapper (Boolean, Byte, Character, Short, Integer, Long, Double, Float).
    
    Since:
    
    3.1
  - isAssignable
```
public static boolean isAssignable(Class<?> cls,
                                   Class<?> toClass)
```
    Checks if one Class can be assigned to a variable of another Class.
    
    Unlike the Class.isAssignableFrom(java.lang.Class) method, this method takes into account widenings of primitive classes and nulls.
    
    Primitive widenings allow an int to be assigned to a long, float or double. This method returns the correct result for these cases.
    
    Null may be assigned to any reference type. This method will return true if null is passed in and the toClass is non-primitive.
    
    Specifically, this method tests whether the type represented by the specified Class parameter can be converted to the type represented by this Class object via an identity conversion widening primitive or widening reference conversion. See The Java Language Specification, sections 5.1.1, 5.1.2 and 5.1.4 for details.
    
    Since Lang 3.0, this method will default behavior for calculating assignability between primitive and wrapper types corresponding to the running Java version; i.e. autoboxing will be the default behavior in VMs running Java versions > 1.5.
    
    Parameters:
    
    cls - the Class to check, may be null
    
    toClass - the Class to try to assign into, returns false if null
    
    Returns:
    
    true if assignment possible
  - isAssignable
```
public static boolean isAssignable(Class<?> cls,
                                   Class<?> toClass,
                                   boolean autoboxing)
```
    Checks if one Class can be assigned to a variable of another Class.
    
    Unlike the Class.isAssignableFrom(java.lang.Class) method, this method takes into account widenings of primitive classes and nulls.
    
    Primitive widenings allow an int to be assigned to a long, float or double. This method returns the correct result for these cases.
    
    Null may be assigned to any reference type. This method will return true if null is passed in and the toClass is non-primitive.
    
    Specifically, this method tests whether the type represented by the specified Class parameter can be converted to the type represented by this Class object via an identity conversion widening primitive or widening reference conversion. See The Java Language Specification, sections 5.1.1, 5.1.2 and 5.1.4 for details.
    
    Parameters:
    
    cls - the Class to check, may be null
    
    toClass - the Class to try to assign into, returns false if null
    
    autoboxing - whether to use implicit autoboxing/unboxing between primitives and wrappers
    
    Returns:
    
    true if assignment possible
  - primitiveToWrapper
```
public static Class<?> primitiveToWrapper(Class<?> cls)
```
    Converts the specified primitive Class object to its corresponding wrapper Class object.
    
    NOTE: From v2.2, this method handles Void.TYPE, returning Void.TYPE.
    
    Parameters:
    
    cls - the class to convert, may be null
    
    Returns:
    
    the wrapper class for cls or cls if cls is not a primitive. null if null input.
    
    Since:
    
    2.1
  - primitivesToWrappers
```
public static Class<?>[] primitivesToWrappers(Class<?>... classes)
```
    Converts the specified array of primitive Class objects to an array of its corresponding wrapper Class objects.
    
    Parameters:
    
    classes - the class array to convert, may be null or empty
    
    Returns:
    
    an array which contains for each given class, the wrapper class or the original class if class is not a primitive. null if null input. Empty array if an empty array passed in.
    
    Since:
    
    2.1
  - wrapperToPrimitive
```
public static Class<?> wrapperToPrimitive(Class<?> cls)
```
    Converts the specified wrapper class to its corresponding primitive class.
    
    This method is the counter part of primitiveToWrapper(). If the passed in class is a wrapper class for a primitive type, this primitive type will be returned (e.g. Integer.TYPE for Integer.class). For other classes, or if the parameter is null, the return value is null.
    
    Parameters:
    
    cls - the class to convert, may be null
    
    Returns:
    
    the corresponding primitive type if cls is a wrapper class, null otherwise
    
    Since:
    
    2.4
    
    See Also:
    
    primitiveToWrapper(Class)
  - wrappersToPrimitives
```
public static Class<?>[] wrappersToPrimitives(Class<?>... classes)
```
    Converts the specified array of wrapper Class objects to an array of its corresponding primitive Class objects.
    
    This method invokes wrapperToPrimitive() for each element of the passed in array.
    
    Parameters:
    
    classes - the class array to convert, may be null or empty
    
    Returns:
    
    an array which contains for each given class, the primitive class or null if the original class is not a wrapper class. null if null input. Empty array if an empty array passed in.
    
    Since:
    
    2.4
    
    See Also:
    
    wrapperToPrimitive(Class)
  - isInnerClass
```
public static boolean isInnerClass(Class<?> cls)
```
    Is the specified class an inner class or static nested class.
    
    Parameters:
    
    cls - the class to check, may be null
    
    Returns:
    
    true if the class is an inner or static nested class, false if not or null
  - getClass
```
public static Class<?> getClass(ClassLoader classLoader,
                                String className,
                                boolean initialize)
                         throws ClassNotFoundException
```
    Returns the class represented by className using the classLoader. This implementation supports the syntaxes "java.util.Map.Entry[]", "java.util.Map$Entry[]", "[Ljava.util.Map.Entry;", and "[Ljava.util.Map$Entry;".
    
    Parameters:
    
    classLoader - the class loader to use to load the class
    
    className - the class name
    
    initialize - whether the class must be initialized
    
    Returns:
    
    the class represented by className using the classLoader
    
    Throws:
    
    ClassNotFoundException - if the class is not found
  - getClass
```
public static Class<?> getClass(ClassLoader classLoader,
                                String className)
                         throws ClassNotFoundException
```
    Returns the (initialized) class represented by className using the classLoader. This implementation supports the syntaxes "java.util.Map.Entry[]", "java.util.Map$Entry[]", "[Ljava.util.Map.Entry;", and "[Ljava.util.Map$Entry;".
    
    Parameters:
    
    classLoader - the class loader to use to load the class
    
    className - the class name
    
    Returns:
    
    the class represented by className using the classLoader
    
    Throws:
    
    ClassNotFoundException - if the class is not found
  - getClass
```
public static Class<?> getClass(String className)
                         throws ClassNotFoundException
```
    Returns the (initialized) class represented by className using the current thread's context class loader. This implementation supports the syntaxes "java.util.Map.Entry[]", "java.util.Map$Entry[]", "[Ljava.util.Map.Entry;", and "[Ljava.util.Map$Entry;".
    
    Parameters:
    
    className - the class name
    
    Returns:
    
    the class represented by className using the current thread's context class loader
    
    Throws:
    
    ClassNotFoundException - if the class is not found
  - getClass
```
public static Class<?> getClass(String className,
                                boolean initialize)
                         throws ClassNotFoundException
```
    Returns the class represented by className using the current thread's context class loader. This implementation supports the syntaxes "java.util.Map.Entry[]", "java.util.Map$Entry[]", "[Ljava.util.Map.Entry;", and "[Ljava.util.Map$Entry;".
    
    Parameters:
    
    className - the class name
    
    initialize - whether the class must be initialized
    
    Returns:
    
    the class represented by className using the current thread's context class loader
    
    Throws:
    
    ClassNotFoundException - if the class is not found
  - getPublicMethod
```
public static Method getPublicMethod(Class<?> cls,
                                     String methodName,
                                     Class<?>... parameterTypes)
                              throws NoSuchMethodException
```
    Returns the desired Method much like Class.getMethod, however it ensures that the returned Method is from a public class or interface and not from an anonymous inner class. This means that the Method is invokable and doesn't fall foul of Java bug 4071957).
```
  Set set = Collections.unmodifiableSet(...);
  Method method = ClassUtils.getPublicMethod(set.getClass(), "isEmpty",  new Class[0]);
  Object result = method.invoke(set, new Object[]);
  
```
    Parameters:
    
    cls - the class to check, not null
    
    methodName - the name of the method
    
    parameterTypes - the list of parameters
    
    Returns:
    
    the method
    
    Throws:
    
    NullPointerException - if the class is null
    
    SecurityException - if a security violation occurred
    
    NoSuchMethodException - if the method is not found in the given class or if the method doesn't conform with the requirements
  - toClass
```
public static Class<?>[] toClass(Object... array)
```
    Converts an array of Object in to an array of Class objects. If any of these objects is null, a null element will be inserted into the array.
    
    This method returns null for a null input array.
    
    Parameters:
    
    array - an Object array
    
    Returns:
    
    a Class array, null if null array input
    
    Since:
    
    2.4
  - getShortCanonicalName
```
public static String getShortCanonicalName(Object object,
                                           String valueIfNull)
```
    Gets the canonical name minus the package name for an Object.
    
    Parameters:
    
    object - the class to get the short name for, may be null
    
    valueIfNull - the value to return if null
    
    Returns:
    
    the canonical name of the object without the package name, or the null value
    
    Since:
    
    2.4
  - getCanonicalName
```
public static String getCanonicalName(Class<?> cls)
```
    Gets the canonical class name for a Class.
    
    Parameters:
    
    cls - the class for which to get the canonical class name; may be null
    
    Returns:
    
    the canonical name of the class, or the empty String
    
    Since:
    
    3.7
    
    See Also:
    
    Class.getCanonicalName()
  - getCanonicalName
```
public static String getCanonicalName(Class<?> cls,
                                      String valueIfNull)
```
    Gets the canonical name for a Class.
    
    Parameters:
    
    cls - the class for which to get the canonical class name; may be null
    
    valueIfNull - the return value if null
    
    Returns:
    
    the canonical name of the class, or valueIfNull
    
    Since:
    
    3.7
    
    See Also:
    
    Class.getCanonicalName()
  - getCanonicalName
```
public static String getCanonicalName(Object object)
```
    Gets the canonical name for an Object.
    
    Parameters:
    
    object - the object for which to get the canonical class name; may be null
    
    Returns:
    
    the canonical name of the object, or the empty String
    
    Since:
    
    3.7
    
    See Also:
    
    Class.getCanonicalName()
  - getCanonicalName
```
public static String getCanonicalName(Object object,
                                      String valueIfNull)
```
    Gets the canonical name for an Object.
    
    Parameters:
    
    object - the object for which to get the canonical class name; may be null
    
    valueIfNull - the return value if null
    
    Returns:
    
    the canonical name of the object or valueIfNull
    
    Since:
    
    3.7
    
    See Also:
    
    Class.getCanonicalName()
  - getShortCanonicalName
```
public static String getShortCanonicalName(Class<?> cls)
```
    Gets the canonical name minus the package name from a Class.
    
    Parameters:
    
    cls - the class for which to get the short canonical class name; may be null
    
    Returns:
    
    the canonical name without the package name or an empty string
    
    Since:
    
    2.4
  - getShortCanonicalName
```
public static String getShortCanonicalName(String canonicalName)
```
    Gets the canonical name minus the package name from a String.
    
    The string passed in is assumed to be a canonical name - it is not checked.
    
    Parameters:
    
    canonicalName - the class name to get the short name for
    
    Returns:
    
    the canonical name of the class without the package name or an empty string
    
    Since:
    
    2.4
  - getPackageCanonicalName
```
public static String getPackageCanonicalName(Object object,
                                             String valueIfNull)
```
    Gets the package name from the canonical name of an Object.
    
    Parameters:
    
    object - the class to get the package name for, may be null
    
    valueIfNull - the value to return if null
    
    Returns:
    
    the package name of the object, or the null value
    
    Since:
    
    2.4
  - getPackageCanonicalName
```
public static String getPackageCanonicalName(Class<?> cls)
```
    Gets the package name from the canonical name of a Class.
    
    Parameters:
    
    cls - the class to get the package name for, may be null.
    
    Returns:
    
    the package name or an empty string
    
    Since:
    
    2.4
  - getPackageCanonicalName
```
public static String getPackageCanonicalName(String canonicalName)
```
    Gets the package name from the canonical name.
    
    The string passed in is assumed to be a canonical name - it is not checked.
    
    If the class is unpackaged, return an empty string.
    
    Parameters:
    
    canonicalName - the canonical name to get the package name for, may be null
    
    Returns:
    
    the package name or an empty string
    
    Since:
    
    2.4
  - hierarchy
```
public static Iterable<Class<?>> hierarchy(Class<?> type)
```
    Get an Iterable that can iterate over a class hierarchy in ascending (subclass to superclass) order, excluding interfaces.
    
    Parameters:
    
    type - the type to get the class hierarchy from
    
    Returns:
    
    Iterable an Iterable over the class hierarchy of the given class
    
    Since:
    
    3.2
  - hierarchy
```
public static Iterable<Class<?>> hierarchy(Class<?> type,
                                           ClassUtils.Interfaces interfacesBehavior)
```
    Get an Iterable that can iterate over a class hierarchy in ascending (subclass to superclass) order.
    
    Parameters:
    
    type - the type to get the class hierarchy from
    
    interfacesBehavior - switch indicating whether to include or exclude interfaces
    
    Returns:
    
    Iterable an Iterable over the class hierarchy of the given class
    
    Since:
    
    3.2

className	len	return
null	1	""
"java.lang.String"	5	"j.l.String"
"java.lang.String"	15	"j.lang.String"
"java.lang.String"	30	"java.lang.String"

Class ClassUtils

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

PACKAGE_SEPARATOR_CHAR

PACKAGE_SEPARATOR

INNER_CLASS_SEPARATOR_CHAR

INNER_CLASS_SEPARATOR

Constructor Detail

ClassUtils

Method Detail

getShortClassName

getShortClassName

getShortClassName

getSimpleName

getSimpleName

getSimpleName

getSimpleName

getName

getName

getName

getName

getPackageName

getPackageName

getPackageName

getAbbreviatedName

getAbbreviatedName

getAllSuperclasses

getAllInterfaces

convertClassNamesToClasses

convertClassesToClassNames

isAssignable

isAssignable

isPrimitiveOrWrapper

isPrimitiveWrapper

isAssignable

isAssignable

primitiveToWrapper

primitivesToWrappers

wrapperToPrimitive

wrappersToPrimitives

isInnerClass

getClass

getClass

getClass

getClass

getPublicMethod

toClass

getShortCanonicalName

getCanonicalName

getCanonicalName

getCanonicalName

getCanonicalName

getShortCanonicalName

getShortCanonicalName

getPackageCanonicalName

getPackageCanonicalName

getPackageCanonicalName

hierarchy

hierarchy