Cloning example and concept

CloneTest.java

/*
 * Cloning creates an exact copy of the object
 * While using = as in the example it creates a reference to same memory location but with different name
 */
import java.io.PrintStream;

public class CloneTest {
    public static void main(String[] arrstring) throws Exception {
        /*t1*/TestClass testClass1 = new TestClass(8798, 540.321);
        /*t2*/TestClass testClass2 = (TestClass)testClass1.clone();
        /*t3*/TestClass testClass3 = testClass1;
		System.out.println("\nt1");testClass1.print();
		System.out.println("\nt2");testClass2.print();
		System.out.println("\nt3");testClass3.print();
		
        System.out.println("\n Changing value of testClass1");
		testClass1.a=1234;
		
		System.out.println("\nt1");testClass1.print();
		System.out.println("\nt2");testClass2.print();
		System.out.println("\nt3");testClass3.print();
		
		System.out.println("\n Changing value of testClass2");
		testClass2.a=5678;
		
		System.out.println("\nt1");testClass1.print();
		System.out.println("\nt2");testClass2.print();
		System.out.println("\nt3");testClass3.print();
		
		System.out.println("\n Changing value of testClass3");
		testClass3.a=9876;
		
		System.out.println("\nt1");testClass1.print();
		System.out.println("\nt2");testClass2.print();
		System.out.println("\nt3");testClass3.print();
        
    }
}

TestClass.java

public class TestClass
implements Cloneable {
    int a;
    double b;

    public TestClass(int a ,double b) {
		this.a = a;
		this.b = b;
    }
	
	public void print()
	{
		System.out.println("a=" +a+ " b=" + b);
	}
	
	public Object clone()
	{
		try{
			return (TestClass)super.clone();
		}
		catch(Exception e)
		{
			System.out.println(e.toString());
		}
		return null;
		
		
	}
}