Java Class class getClasses() method with example

Class class getClasses() method: Here, we are going to learn about the getClasses() method of Class class with its syntax and example.
Submitted by Preeti Jain, on November 04, 2019

Class class getClasses() method

getClasses() method is available in java.lang package.
getClasses() method is used to return an array that contains Class objects denoting all the public classes and interfaces that are a member of the class denoted by this Class object and it includes public class and interface members inherited from parent classes.
getClasses() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
getClasses() method may throw SecurityException at the time of checking security constraints.SecurityException: This exception raise when security manager exists.

Syntax:

    public Class[] getClasses();

Parameter(s):

It does not accept any parameter.

Return value:

The return type of this method is Class[], it returns an array of Class objects denoting the public members of this class.

Example:

// Java program to demonstrate the example 
// of Class[] getClasses() method of  Class 

public class GetClassesOfClass {
    public static void main(String[] args) throws Exception {
        // It returns the Class object attached 
        // with the given classname
        Class cl = Class.forName("java.lang.ClassLoader");

        // It returns an array of Class objects denotes the public
        // member of the class "java.lang.ClassLoader"
        Class[] public_classes = cl.getClasses();

        // Traversing ClassLoader class
        for (int i = 1; i <= public_classes.length; ++i) {
            System.out.print("Class Name: ");
            System.out.println(public_classes[i].getName());
        }
    }
}