Class getGenericInterfaces() method in Java with Examples

The getGenericInterfaces() method of java.lang.Class class is used to get the type of interfaces directly implemented by this entity. This entity can be a class or an interface. The method returns an array of type of interfaces directly implemented by this entity.

Syntax:

public Type[] getGenericInterfaces()

Parameter: This method does not accept any parameter.

Return Value: This method returns an array of type of interfaces directly implemented by this entity.

Below programs demonstrate the getGenericInterfaces() method.

Example 1:

// Java program to demonstrate
// getGenericInterfaces() method

import java.util.*;

public class Test {
    public static void main(String[] args)
        throws ClassNotFoundException
    {

        // returns the Class object for this class
        Class myClass = Class.forName("Test");

        System.out.println("Class represented by myClass: "
                           + myClass.toString());

        // Get the type of interfaces of myClass
        // using getGenericInterfaces() method
        System.out.println(
            "GenericInterfaces of myClass: "
            + Arrays.toString(
                  myClass.getGenericInterfaces()));
    }
}

Output:

Class represented by myClass: class Test
GenericInterfaces of myClass: []

Example 2:

// Java program to demonstrate
// getGenericInterfaces() method

import java.util.*;

interface Arr {
}

public class Test implements Arr {

    public static void main(String[] args)
        throws ClassNotFoundException
    {
        // returns the Class object
        Class myClass = Class.forName("Test");

        // Get the type of interfaces of myClass
        // using getGenericInterfaces() method
        System.out.println(
            "GenericInterfaces of myClass: "
            + Arrays.toString(
                  myClass.getGenericInterfaces()));
    }
}

Output:

GenericInterfaces of myClass: [interface Arr]

Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#getGenericInterfaces–