How do I get direct superclass and interfaces of a class?

Java reflection also dealing with inheritance concepts. You can get the direct interfaces and direct super class of a class by using method getInterfaces() and getSuperclass() of java.lang.Class object.

getInterfaces() will returns an array of Class objects that represent the direct super interfaces of the target Class object.
getSuperclass() will returns the Class object representing the direct super class of the target Class object or null if the target represents Object class, an interface, a primitive type, or void.

package org.kodejava.lang.reflect;

import javax.swing.*;
import java.util.Date;

public class GetSuperClassDemo {
    public static void main(String[] args) {
        GetSuperClassDemo.get(String.class);
        GetSuperClassDemo.get(Date.class);
        GetSuperClassDemo.get(JButton.class);
        GetSuperClassDemo.get(Timer.class);
    }

    public static void get(Class<?> clazz) {
        // Gets array of direct interface of clazz object
        Class<?>[] interfaces = clazz.getInterfaces();

        System.out.format("Direct Interfaces of %s:%n",
                clazz.getName());
        for (Class<?> clz : interfaces) {
            System.out.println(clz.getName());
        }

        // Gets direct superclass of clazz object
        Class<?> superclz = clazz.getSuperclass();
        System.out.format("Direct Superclass of %s: is %s %n",
                clazz.getName(), superclz.getName());
        System.out.println("====================================");
    }
}

Here is the result of the code snippet:

Direct Interfaces of java.lang.String:
java.io.Serializable
java.lang.Comparable
java.lang.CharSequence
Direct Superclass of java.lang.String: is java.lang.Object 
====================================
Direct Interfaces of java.util.Date:
java.io.Serializable
java.lang.Cloneable
java.lang.Comparable
Direct Superclass of java.util.Date: is java.lang.Object 
====================================
Direct Interfaces of javax.swing.JButton:
javax.accessibility.Accessible
Direct Superclass of javax.swing.JButton: is javax.swing.AbstractButton 
====================================
Direct Interfaces of javax.swing.Timer:
java.io.Serializable
Direct Superclass of javax.swing.Timer: is java.lang.Object 
====================================

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Wayan

Founder at Kode Java

A programmer, runner and recreational diver, lives on the island of Bali, Indonesia. Programming in Java, Spring Framework, Hibernate / JPA, MySQL. To support me working on this project, buy me a cup of coffee, every little bit helps. Thank you.

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