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java.util Project 1

Stack Implementation

In this programming tutorials we shall be learn how to implement a stack in Java. A Stack is like a bucket in which we can put elements one-by-one in sequence and retrieve elements from the bucket according to the sequence of the last entered element.

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Stack is a collection of data and follows the LIFO (Last in, first out) rule that mean you can insert the elements one-by-one in sequence and the last inserted element can be retrieved at once from the bucket. Elements are inserted and retrieved to/from the stack through the push() and pop() method.

Stack(): This constructor of the Stack class is used to creates an empty stack in which we can push the value which is mention with the creation of stack.

Stack.push(Object obj): This method is used to insert or push the data or element in the stack.

Stack.pop(): This is the method to removes the objects like data or elements at the top positions of stack.


package r4r;
import java.util.*;
public class stacktests {
Stack<Integer> stack;
String str;
int num, n;
public static void main(String[] args){
stacktests s = new stacktests();

public stacktests(){
stack = new Stack<Integer>();
InputStreamReader isr = new InputStreamReader(;
BufferedReader br = new BufferedReader(isr);
System.out.print("Enter the elements No. : ");
str = br.readLine();
num = Integer.parseInt(str);
for(int i = 1; i <= num; i++){
System.out.print("Enter elements : ");
str = br.readLine();
n = Integer.parseInt(str);
catch(IOException e){}
System.out.print("Fetch elements from the stack : ");
while (!stack.empty()){
System.out.print(stack.pop() + "  ");

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