Stack contains() method in Java with Example

The java.util.Stack.contains() method is used to check whether a specific element is present in the Stack or not. So basically it is used to check if a Stack contains any particular element or not.

Syntax:

Stack.contains(Object element)

Parameters: This method takes a mandatory parameter element which is of the type of Stack. This is the element that needs to be tested if it is present in the Stack or not.

Return Value: This method returns True if the element is present in the Stack otherwise it returns False.

Below programs illustrate the Java.util.Stack.contains() method:

Program 1:

// Java code to illustrate contains() 
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); 
  
        // Check for "Geeks" in the Stack 
        System.out.println("Does the Stack contains 'Geeks'? "
                           + stack.contains("Geeks")); 
  
        // Check for "4" in the Stack 
        System.out.println("Does the Stack contains '4'? "
                           + stack.contains("4")); 
  
        // Check if the Queue contains "No" 
        System.out.println("Does the Stack contains 'No'? "
                           + stack.contains("No")); 
    } 
} 

Output:

Stack: [Welcome, To, Geeks, 4, Geeks]
Does the Stack contains 'Geeks'? true
Does the Stack contains '4'? true
Does the Stack contains 'No'? false

Program 2:

// Java code to illustrate contains() 
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 Stack 
        stack.add(10); 
        stack.add(15); 
        stack.add(30); 
        stack.add(20); 
        stack.add(5); 
  
        // Displaying the Stack 
        System.out.println("Stack: " + stack); 
  
        // Check for "Geeks" in the Stack 
        System.out.println("Does the Stack contains 'Geeks'? "
                           + stack.contains("Geeks")); 
  
        // Check for "4" in the Stack 
        System.out.println("Does the Stack contains '4'? "
                           + stack.contains("4")); 
  
        // Check if the Stack contains "No" 
        System.out.println("Does the Stack contains 'No'? "
                           + stack.contains("No")); 
    } 
} 

Output:

Stack: [10, 15, 30, 20, 5]
Does the Stack contains 'Geeks'? false
Does the Stack contains '4'? false
Does the Stack contains 'No'? false

Attention reader! Don’t stop learning now. Get hold of all the important Java and Collections concepts with the Fundamentals of Java and Java Collections Course at a student-friendly price and become industry ready.

My Personal Notes

Recommended Posts: