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Stack clear() method in Java with Example

  • Last Updated : 24 Dec, 2018
Geek Week

The Java.util.Stack.clear() method is used to remove all the elements from a Stack. Using the clear() method only clears all the element from the Stack and does not delete the Stack. In other words, we can say that the clear() method is used to only empty an existing Stack.

Syntax:

Stack.clear()

Parameters: The method does not take any parameter

Return Value: The function does not returns any value.

Below programs illustrate the Java.util.Stack.clear() method.



Example 1:




// Java code to illustrate clear()
import java.util.*;
  
public class GFG {
    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);
  
        // Clearing the Stack using clear() method
        stack.clear();
  
        // Displaying the final Stack after clearing;
        System.out.println("The final Stack: " + stack);
    }
}
Output:
Stack: [Welcome, To, Geeks, 4, Geeks]
The final Stack: []

Example 2:




// Java code to illustrate clear()
import java.util.*;
  
public class GFG {
    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);
  
        // Clearing the Stack using clear() method
        stack.clear();
  
        // Displaying the final Stack after clearing;
        System.out.println("The final Stack: " + stack);
    }
}
Output:
Stack: [10, 15, 30, 20, 5]
The final Stack: []

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