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Commit 68603f8

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basic operations & implementations with example of inbuilt stack from java.utils.
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package com.udemy.dsapart1.stacks;
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import java.util.Scanner;
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import java.util.Stack;
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public class SimpleStackOperations {
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public static Stack<Double> firstStack;
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public static void main(String[] args) {
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Scanner scInpObj = new Scanner(System.in);
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System.out.print("\nEnter the size of Stack : ");
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int sizeOfStack = scInpObj.nextInt();
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firstStack = new Stack<>();
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//firstStack.setSize(sizeOfStack);
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System.out.println("\nSize of stack has been set.");
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System.out.println("\nEnter the stack elements : ");
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pushElementsIntoStack(sizeOfStack);
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System.out.println("\nInput Stack : " + firstStack);
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System.out.println("\nInitial size of stack - "+firstStack.size());
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System.out.println("\nInitial capacity of stack - "+firstStack.capacity());
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System.out.println("\nIs the stack is Empty : "+firstStack.isEmpty());
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System.out.println("***************** Perform Some Pop() & peek() operation LIFO (principle) **********************");
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System.out.println("\npeek the item : "+firstStack.peek());
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System.out.println("\nAfter peek Current Stack status : "+firstStack);
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System.out.println("\npop the item : "+firstStack.pop());
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System.out.println("\npop the item : "+firstStack.pop());
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System.out.println("\nAfter pop's Current Stack status : "+firstStack);
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System.out.println("\npop the item : "+firstStack.pop());
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System.out.println("\nCurrent Stack status : "+firstStack);
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System.out.println("\npeek the item : "+firstStack.peek());
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System.out.println("\nModifyed size of stack - "+firstStack.size());
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System.out.println("\nModifyed capacity of stack - "+firstStack.capacity());
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System.out.println("***************** Perform insert operation **********************");
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firstStack.insertElementAt(112.0, 4);
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System.out.println("\nInserting 112.0 at 4th position.");
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firstStack.insertElementAt(150.0, 3);
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System.out.println("\nInserting 150.0 at 3rd position.");
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System.out.println("\nCurrent new Stack status : "+firstStack);
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firstStack.insertElementAt(166.0, 5);
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System.out.println("\nInserting 166.0 at 5th position.");
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System.out.println("\nCurrent new Stack status : "+firstStack);
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System.out.println("***************** Perform remove operation **********************");
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System.out.println("\nRemove by index operation status : "+firstStack.remove(3));
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System.out.println("\nCurrent new Stack status : "+firstStack);
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System.out.println("\nRemove by value operation status : "+firstStack.remove(150.0));
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System.out.println("\n2nd Remove by value operation status : "+firstStack.remove(6.0));
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System.out.println("\nCurrent new final Stack status : "+firstStack);
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System.out.println("\nFinal size of stack - "+firstStack.size());
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System.out.println("\nFinal capacity of stack - "+firstStack.capacity());
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}
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private static void pushElementsIntoStack(int sizeOfStack) {
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Scanner scInp1Obj = new Scanner(System.in);
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for (int i = 0; i < sizeOfStack; i++) {
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System.out.print("\npush the element No " + (i + 1) + " : ");
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firstStack.push(scInp1Obj.nextDouble());
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}
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}
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}

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