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Java program to compare two Stack collections

Java example to compare two Stack collections.
Submitted by Nidhi, on April 25, 2022

Problem Solution:

In this program, we will create 3 Stack Collections with a few elements. Then we will compare the Stack collection using the equals() method and print the appropriate message.

Program/Source Code:

The source code to compare two Stack collections is given below. The given program is compiled and executed successfully.

// Java program to compare two Stack collections

import java.io.*;
import java.util.*;

public class Main {
  public static void main(String[] args) {
    Stack stack1 = new Stack();
    Stack stack2 = new Stack();
    Stack stack3 = new Stack();

    stack1.push(10);
    stack1.push(20);

    stack2.push(10);
    stack2.push(20);

    stack3.push(30);
    stack3.push(40);

    if (stack1.equals(stack2))
      System.out.println("Stacks stack1 and stack2 are equal.");
    else
      System.out.println("Stacks stack1 and stack2 are not equal.");

    if (stack2.equals(stack3))
      System.out.println("Stacks stack2 and stack3 are equal.");
    else
      System.out.println("Stacks stack2 and stack3 are not equal.");
  }
}

Output:

Stacks stack1 and stack2 are equal.
Stacks stack2 and stack3 are not equal.

Explanation:

In the above program, we imported the "java.io.*" and "java.util.*"packages to use the Stack collection class. Here, we created a class Main. The Main class contains a main() method. The main() method is the entry point for the program.

In the main() method, we created 3 Stack collections and add elements. Then we compared stack elements using the equals() method. The equals() method returns true if stacks contain the same elements otherwise it returns false.

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