Stack contains() method in Java with Example

Stack addElement(E) 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("Beginner"); 
        stack.add("4"); 
        stack.add("Beginner"); 
  
        // Displaying the Stack 
        System.out.println("Stack: " + stack); 
  
        // Check for "Beginner" in the Stack 
        System.out.println("Does the Stack contains 'Beginner'? "
                           + stack.contains("Beginner")); 
  
        // 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, Beginner, 4, Beginner]
Does the Stack contains 'Beginner'? 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 "Beginner" in the Stack 
        System.out.println("Does the Stack contains 'Beginner'? "
                           + stack.contains("Beginner")); 
  
        // 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 'Beginner'? false
Does the Stack contains '4'? false
Does the Stack contains 'No'? false

Tags:

#Java - util package #Java-Collections #Java-Functions #Java-Stack #Java #Java #Java-Collections

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