Java Doc for ClassUtils.java in  » Library » Apache-common-lang » org » apache » commons » lang » Java Source Code / Java DocumentationJava Source Code and Java Documentation

Operates on classes without using reflection.

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

ClassUtils instances should NOT be constructed in standard programming.

Given a List of class names, this method converts them into classes.

A new List is returned.

Given a List of Class objects, this method converts them into class names.

A new List is returned.

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.

Gets the package name of a Class.

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.

Gets the class name minus the package name from a Class.

Checks if an array of Classes can be assigned to another array of Classes.

This method calls ClassUtils.isAssignable(Class,Class) isAssignable for each Class pair in the input arrays.

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.

Converts the specified primitive Class object to its corresponding wrapper Class object.

NOTE: From v2.2, this method handles Void.TYPE, returning Void.TYPE.

Converts the specified array of primitive Class objects to an array of its corresponding wrapper Class objects.

The inner class separator String: "$".

The inner class separator character: '$' == .

The package separator String: ".".

The package separator character: '.' == .

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.

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.

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.

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.

Gets a List of superclasses for the given class.

Gets the package name of an Object.

Gets the package name of a Class.

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.

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[]);

Gets the class name minus the package name for an Object.

Gets the class name minus the package name from a Class.

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.

Checks if an array of Classes can be assigned to another array of Classes.

This method calls ClassUtils.isAssignable(Class,Class) 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.

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.

Is the specified class an inner class or static nested class.

Converts the specified primitive Class object to its corresponding wrapper Class object.

NOTE: From v2.2, this method handles Void.TYPE, returning Void.TYPE.

Converts the specified array of primitive Class objects to an array of its corresponding wrapper Class objects.