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Stack equals() method in Java with Example
  • Last Updated : 24 Dec, 2018

The Java.util.Stack.equals(Object obj) method of Stack class in Java is used verify the equality of an Object with a Stack and compare them. The list returns true only if both Stack contains same elements with same order.

Syntax:

first_Stack.equals(second_Stack)

Parameters: This method accepts a mandatory parameter second_Stack which refers to the second Stack to be compared to the first Stack.

Return value: The method returns true if the equality holds and both the objects and Stack are equal else it returns false.

Below programs are used to illustrate the working of the java.util.Stack.elements() method:



Program 1:




// Java code to illustrate the equals() method
import java.util.*;
  
public class Stack_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Stack
        Stack<String> stack1 = new Stack<String>();
  
        // Inserting elements into the table
        stack1.add("Geeks");
        stack1.add("4");
        stack1.add("Geeks");
        stack1.add("Welcomes");
        stack1.add("You");
  
        // Displaying the Stack
        System.out.println("The Stack is: "
                           + stack1);
  
        // Creating an empty Stack
        Stack<String> stack2 = new Stack<String>();
  
        // Inserting elements into the table
        stack2.add("Geeks");
        stack2.add("4");
        stack2.add("Geeks");
        stack2.add("Welcomes");
        stack2.add("You");
  
        // Displaying the Stack
        System.out.println("The Stack is: "
                           + stack2);
  
        System.out.println("Are both of them equal? "
                           + stack1.equals(stack2));
    }
}
Output:
The Stack is: [Geeks, 4, Geeks, Welcomes, You]
The Stack is: [Geeks, 4, Geeks, Welcomes, You]
Are both of them equal? true

Program 2 :




// Java code to illustrate the equals() method
import java.util.*;
  
public class Stack_Demo {
    public static void main(String[] args)
    {
  
        // Creating an empty Stack
        Stack<Integer> stack1 = new Stack<Integer>();
  
        // Inserting elements into the table
        stack1.add(10);
        stack1.add(15);
        stack1.add(20);
        stack1.add(25);
        stack1.add(30);
  
        // Displaying the Stack
        System.out.println("The Stack is: " + stack1);
  
        // Creating an empty Stack
        Stack<Integer> stack2 = new Stack<Integer>();
  
        // Inserting elements into the table
        stack2.add(10);
        stack2.add(15);
        stack2.add(20);
        stack2.add(25);
        stack2.add(30);
        stack2.add(40);
  
        // Displaying the Stack
        System.out.println("The Stack is: " + stack2);
  
        System.out.println("Are both of them equal? "
                           + stack1.equals(stack2));
    }
}
Output:
The Stack is: [10, 15, 20, 25, 30]
The Stack is: [10, 15, 20, 25, 30, 40]
Are both of them equal? false

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