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How to check if a class represent an interface type?

You can use the isInterface() method call of the java.lang.Class to identify if a class objects represent an interface type.

package com.javacoderanch.example.lang.reflect;


public class IsInterfaceDemo {
    public static void main(String[] args) {

    private static void get(Class clazz) {
        if (clazz.isInterface()) {
            System.out.println(clazz.getName() +
                    " is an interface type.");
        } else {
            System.out.println(clazz.getName() +
                    " is not an interface type.");

Here is the result of the program: is an interface type.
java.lang.Long is not an interface type.