its101.md.wk.07.StackImplementation

package its101.mdwk07;

//Create a custom Stack class for creating stack
public class Stack {
    private final int maxSize;
    private final int[] stackArray;
    private int top;

    public Stack(int h) {
        maxSize = h;
        stackArray = new int[maxSize];
        top = -1;
    }

    //Create push() method, this will be use to push new element to the top of the stack
    public void push(int j) {
        if (top >= (maxSize - 1)){
            System.out.println("Error: Stack is overflow");
        }
        else {
        stackArray[++top] = j;
        System.out.println(j + " is pushed into the stack");
        }
    }

    //Create pop() method, this will be use to pop element from the top of the stack
    public int pop() {
        if (top < 0){
            System.out.print("Error: Stack is underflow");
        }
        else {
            int k = stackArray[top--];
            System.out.println(k + " is popped from the stack");
        }
        return 0;
    }

    //Create peek() method, this will look at the top element of the stack without removing it
    public int peek() {
        return stackArray[top];
    }

    //Create print() method, this will print the stack's elements
    void printStack(){
        for(int i = top;i>-1;i--){
            System.out.print(" "+ stackArray[i]);
        }
        System.out.println();
    }

    //Create isEmpty() method, this will check if the stack is empty or not
    public boolean isEmpty() {
        return (top == -1);
    }

    //Create isFull() method, this will check if the stack is full or the set maxSize s is reached
    public boolean isFull() {
        return (top == maxSize -1);
    }

    public static void main(String[] args) {
        // Create stack object
        Stack MyStack = new Stack(5); // maxSize is set to 5

        // Check if stack is empty using isEmpty()
        boolean emptyResult = MyStack.isEmpty();
        System.out.println("Is the stack empty? " + emptyResult);    //  It will print true because the stack is empty

        // Push elements into the stack
        MyStack.push(1);
        MyStack.push(2);
        MyStack.push(3);
        MyStack.push(4);
        MyStack.push(5);

        // Print the stack element using the print()
        System.out.print("The element of the stack: ");
        MyStack.printStack();

        // Check again if stack is empty using isEmpty()
        emptyResult = MyStack.isEmpty();
        System.out.println("Is the stack empty? " + emptyResult);   //  It will print false because the stack is now contain elements

        // Check if stack is full using isFull()
        boolean fullResult = MyStack.isFull();
        System.out.println("Is the stack full? " + fullResult);    // It will print true because the maxSize is reached

        // Check what element at the top of the stack using peek()
        int topElement = MyStack.peek();
        System.out.println("Element at top of stack: " + topElement);
    }
}