How To Get Class Name From Object

This example illustrates how to get the class name from its object. If you are aware of the java.lang.Class, it has methods for knowing the details of a class. One of the method defined in that class is Class.getName() which is useful for getting the name of the class. Note that, each instance has “class” variable which returns the java.lang.Class for that particular object. By using the getName() method, one could get the name of the class.

Lets look this example. This example used few sample classes and getting name of that classes.

GetObjectClassName

package javabeat.net.core;

/**
 * Get Object's Class Name Example
 *
 * @author Krishna
 *
 */
public class GetObjectClassName {
	public static void main(String[] args) {
		Class<?> classVar = null;
		String str = "Test String";
		classVar = str.getClass();
		System.out.println("Class Name 1 : " + classVar.getName());

		classVar = int.class;
		System.out.println("Class Name 2 : " + classVar.getName());

		classVar = int[].class;
		System.out.println("Class Name 3 : " + classVar.getName());

		classVar = Void.TYPE;
		System.out.println("Class Name 4 : " + classVar.getName());

		classVar = Enum.class;
		System.out.println("Class Name 5 : " + classVar.getName());

	}
}

Output…

Class Name 1 : java.lang.String
Class Name 2 : int
Class Name 3 : [I
Class Name 4 : void
Class Name 5 : java.lang.Enum

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About Krishna Srinivasan

He is Founder and Chief Editor of JavaBeat. He has more than 8+ years of experience on developing Web applications. He writes about Spring, DOJO, JSF, Hibernate and many other emerging technologies in this blog.

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