The clone() method of Stack class is used to return a shallow copy of this Stack. It just creates a copy of the Stack. The copy will have a reference to a clone of the internal data array but not a reference to the original internal data array.
Syntax:
Stack.clone()
Parameters: The method does not take any parameter.
Return Value: The method returns an Object which is just the copy of the Stack.
Exception: This method throws CloneNotSupportedException if the object’s class does not support the Cloneable interface.
Below programs illustrate the Java.util.Stack.clone() method:
Program 1:
// Java code to illustrate clone()  import java.util.*;  public class StackDemo {    public static void main(String args[])    {        // Creating an empty Stack        Stack<String> stack = new Stack<String>();          // Use add() method to add elements into the Stack        stack.add("Welcome");        stack.add("To");        stack.add("Geeks");        stack.add("4");        stack.add("Geeks");          // Displaying the Stack        System.out.println("Stack: " + stack);          // Creating another Stack to copy        Object copy_Stack = stack.clone();          // Displaying the copy of Stack        System.out.println("The cloned Stack is: "                           + copy_Stack);    }} |
Output:
Stack: [Welcome, To, Geeks, 4, Geeks] The cloned Stack is: [Welcome, To, Geeks, 4, Geeks]
Program 2:
// Java code to illustrate clone()  import java.util.*;  public class StackDemo {    public static void main(String args[])    {        // Creating an empty Stack        Stack<Integer> stack = new Stack<Integer>();          // Use add() method to add elements into the Queue        stack.add(10);        stack.add(15);        stack.add(30);        stack.add(20);        stack.add(5);          // Displaying the Stack        System.out.println("Stack: " + stack);          // Creating another Stack to copy        Object copy_Stack = (Stack)stack.clone();          // Displaying the copy of Stack        System.out.println("The cloned Stack is: "                           + copy_Stack);    }} |
Output:
Stack: [10, 15, 30, 20, 5] The cloned Stack is: [10, 15, 30, 20, 5]
