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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 statement

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.

Java program to compare two Stack collections

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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