⬅ Write a Stack from Scratch | A Helpful Line-by-Line Code Tutorial

public class Stack {
	
	static final int max = 5;
	int[] stack = new int[max];
	int top;
	
	Stack(){
		
		top = 0;
	
	}
	
	int pop(){
		
		try{
			
			return stack[--top];
		
		}catch(Exception e){
			
			System.out.println("Cannot pop anymore!");
			return -1;
			
		}
	
	}
	
	void push(int num){
		
		if(top<max){
			
			stack[top++] = num;
			
		}else{
			
			System.out.println("Elements cannot be added!");
			
		}
	
	}
	
	boolean isStackFull(){
		
		if(top>=max-1){
			
			return true;
			
		}else{
			
			return false;
			
		}
		
	}
	
}


public class StackImplementation {

	public static void main(String[] args){
		
		Stack stack = new Stack();		
		
		System.out.println( (stack.pop()==-1) ? "Empty Stack!" : "Not Empty!" );

		stack.push(30);
		System.out.println(stack.pop());
		
	}
	
}