Stack equals() method in Java with Example - GeeksforGeeks

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() methodimport 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));    }}
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() methodimport 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));    }}
The Stack is: [10, 15, 20, 25, 30]
The Stack is: [10, 15, 20, 25, 30, 40]
Are both of them equal? false

Java - util package
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