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Stack containsAll() method in Java with Example

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  • Last Updated : 24 Dec, 2018
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The containsAll() method of Java Stack is used to check whether two stacks contain the same elements or not. It takes one stack as a parameter and returns True if all of the elements of this stack is present in the other stack.

Syntax:

public boolean containsAll(Collection C)

Parameters: The parameter C is a Collection. This parameter refers to the stack whose elements occurrence is needed to be checked in this stack.

Return Value: The method returns True if this stack contains all the elements of other stack otherwise it returns False.

Below programs illustrate the Stack.containsAll() method:

Program 1:




// Java code to illustrate
// Stack containsAll()
  
import java.util.*;
  
class StackDemo {
    public static void main(String args[])
    {
  
        // Creating an empty stack
        Stack<String>
            stack = new Stack<String>();
  
        // Use add() method to
        // add elements in the stack
        stack.add("Geeks");
        stack.add("for");
        stack.add("Geeks");
        stack.add("10");
        stack.add("20");
  
        // prints the stack
        System.out.println("Stack 1: "
                           + stack);
  
        // Creating another empty stack
        Stack<String>
            stack2 = new Stack<String>();
  
        // Use add() method to
        // add elements in the stack
        stack2.add("Geeks");
        stack2.add("for");
        stack2.add("Geeks");
        stack2.add("10");
        stack2.add("20");
  
        // prints the stack
        System.out.println("Stack 2: "
                           + stack2);
  
        // Check if the stack
        // contains same elements
        System.out.println("\nDoes stack 1 contains stack 2: "
                           + stack.containsAll(stack2));
    }
}

Output:

Stack 1: [Geeks, for, Geeks, 10, 20]
Stack 2: [Geeks, for, Geeks, 10, 20]

Does stack 1 contains stack 2: true

Program 2:




// Java code to illustrate boolean containsAll()
  
import java.util.*;
  
class StackDemo {
    public static void main(String args[])
    {
  
        // Creating an empty stack
        Stack<String>
            stack = new Stack<String>();
  
        // Use add() method to
        // add elements in the stack
        stack.add("Geeks");
        stack.add("for");
        stack.add("Geeks");
  
        // prints the stack
        System.out.println("Stack 1: "
                           + stack);
  
        // Creating another empty stack
        Stack<String>
            stack2 = new Stack<String>();
  
        // Use add() method to
        // add elements in the stack
        stack2.add("10");
        stack2.add("20");
  
        // prints the stack
        System.out.println("Stack 2: "
                           + stack2);
  
        // Check if the stack
        // contains same elements
        System.out.println("\nDoes stack 1 contains stack 2: "
                           + stack.containsAll(stack2));
    }
}

Output:

Stack 1: [Geeks, for, Geeks]
Stack 2: [10, 20]

Does stack 1 contains stack 2: false

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