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Java Stack peek() Method with Example

Stack Class peek() method: Here, we are going to learn about the peek() method of Stack Class with its syntax and example.
Submitted by Preeti Jain, on March 24, 2020

Stack Class peek() method

• peek() method is available in java.util package.
• peek() method is used to return the top element from this Stack and it retrieves elements without removing.
• peek() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• peek() method does not throw an exception at the time of returning top element.

Syntax:

    public Object peek();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is Object, it returns head element from the stack.

Example:

// Java program to demonstrate the example 
// of Object peek() method of Stack Class

import java.util.*;

public class PeekOfStack {
 public static void main(String args[]) {
  // Instantiates Stack object
  Stack s = new Stack();

  // By using push() method isto
  // push the given onto the stack
  s.push(10);
  s.push(20);
  s.push(30);
  s.push(40);
  s.push(50);

  // Display Stack
  System.out.println("s:" + s);

  // By using peek() method is
  // to return the top element
  // without removing
  Object ele = s.peek();

  // Display Peek Element
  System.out.println("s.peek(): " + ele);
 }
}

Output

s:[10, 20, 30, 40, 50]
s.peek(): 50