DataStructures/TheStack.java at master · CodeNerve/DataStructures · GitHub

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import java.util.Arrays;

// Stacks with classes

public class TheStack {


	private String[] stackArray;
	private int stackSize;
	private int topOfStack = -1;


	public TheStack(int size) {

		stackSize = size;

		stackArray = new String[size];

		Arrays.fill(stackArray," ");


	}

	public void push(String input) {

		displayStack();

		if(topOfStack + 1 <stackSize) {

			topOfStack++;

			System.out.println(input+" was pushed to the stack");

			stackArray[topOfStack] = input;
		}

		else
			System.out.println("Sorry the stack is full");


	}

	public String pop() {

		System.out.println();

		if(topOfStack>=0) {

			System.out.println("Top of the stack "+stackArray[topOfStack]+" was popped from the stack");

			stackArray[topOfStack] = " ";

			return stackArray[topOfStack--];

		}

		else
			System.out.println("Stack is empty");


		return "-1";


	}

	public String peek() {

		System.out.println();

		displayStack();

		System.out.println(stackArray[topOfStack]+" is on top of the stack currently");

		return stackArray[topOfStack];

	}


	public void displayStack() {

		System.out.println();
		System.out.println();

		for(int i=0;i<stackSize;i++)
			System.out.print(i+" | ");

		System.out.println();

		for(int i=0;i<stackArray.length;i++)
			System.out.print(stackArray[i]+" | ");

	}

	public void pushMultiple(String input) {

		String[] tempString = input.split(" ");

		for(int i=0;i<tempString.length;i++)
			push(tempString[i]);

	}

	public void popAllDirectly() {

		System.out.println();
		System.out.println("Popping everything off directly from the stack");

		for(int i=0;i<stackArray.length;i++) {
			stackArray[i]=" ";
		}

		displayStack();
	}

	public void popAllOneByOne() {

		System.out.println();

		for(int i=0;i<stackArray.length;i++)
			pop();
	}

	public static void main(String[] args) {


		TheStack stack = new TheStack(10);

		stack.push("2");

		stack.push("3");

		stack.peek();

		stack.push("5");

		stack.push("9");

		stack.peek();

		stack.pop();

		stack.displayStack();

		stack.pushMultiple("0 1 7 3");

		stack.displayStack();

		stack.peek();

		stack.pop();

		stack.displayStack();

		stack.popAllOneByOne();

		stack.push("4");
		stack.push("5");
		stack.push("7");

		stack.displayStack();

		stack.popAllDirectly();


	}


}