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:
import java.util.*;
public class StackDemo {
public static void main(String args[])
{
Stack<String> stack = new Stack<String>();
stack.add( "Welcome" );
stack.add( "To" );
stack.add( "Geeks" );
stack.add( "4" );
stack.add( "Geeks" );
System.out.println( "Stack: " + stack);
Object copy_Stack = stack.clone();
System.out.println( "The cloned Stack is: "
+ copy_Stack);
}
}
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Output:
Stack: [Welcome, To, Geeks, 4, Geeks]
The cloned Stack is: [Welcome, To, Geeks, 4, Geeks]
Program 2:
import java.util.*;
public class StackDemo {
public static void main(String args[])
{
Stack<Integer> stack = new Stack<Integer>();
stack.add( 10 );
stack.add( 15 );
stack.add( 30 );
stack.add( 20 );
stack.add( 5 );
System.out.println( "Stack: " + stack);
Object copy_Stack = (Stack)stack.clone();
System.out.println( "The cloned Stack is: "
+ copy_Stack);
}
}
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Output:
Stack: [10, 15, 30, 20, 5]
The cloned Stack is: [10, 15, 30, 20, 5]