To enable our object to be cloned we need to override `Object` class clone method. We can also add a `java.lang.Cloneable` interface to our class, this interface is an empty interface. When we call the `clone()` method we need the add a try-catch block to catch the `CloneNotSupportedException`. This exception will be thrown if we tried to clone an object that doesn’t suppose to be cloned.

Calling the `clone()` method does a stateful, shallow copy down inside the Java Virtual Machine (JVM). It creates a new object and copies all the fields from the old object into the newly created object.

“`java
package org.kodejava.basic;

public class CloneDemo implements Cloneable {
private int number;
private transient int data;

@Override
protected Object clone() throws CloneNotSupportedException {
return super.clone();
}

public static void main(String[] args) {
CloneDemo clone = new CloneDemo();
clone.number = 5;
clone.data = 1000;

try {
// Create a clone of CloneDemo object. When we change the value of
// number and data field in the cloned object it won't affect the
// original object.
CloneDemo objectClone = (CloneDemo) clone.clone();
objectClone.number = 10;
objectClone.data = 5000;

System.out.println("cloned object = " + objectClone);
System.out.println("origin object = " + clone);
} catch (CloneNotSupportedException e) {
e.printStackTrace();
}
}

public String toString() {
return "[number = " + number + "; data = " + data + "]";
}
}
“`