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
