stack-java's Introduction

This is `stack` code in java

related to my blog I made this file to everybody can use it

Usage

You can use this in any IDE you want like Eclips, VSCode, Visual Studeo, ... if you want to run this in terminal you should first install Java in your computer! Compile the code and run it like this:

$ javac Main.java
$ java Main

Code

class Main{

    public static void main(String [] args){

        int[] stack = testStack();
        for (int i : stack) {
            System.out.println(i);
        }
    }
 
    
    public static int[] testStack(){

        Stack stack = new Stack(5);
        stack.push(1);
        stack.push(2);
        stack.push(3);
        stack.push(4);
        stack.pop();
        stack.push(5);
        stack.pop();
        stack.push(6);
        stack.pop();
        stack.push(7);
        stack.pop();

        return stack.getStack();
    }




    /**
     * Innerface Stack
     */
    public interface StackInterFace {
    
        public boolean push (int item); // add item to stack
        public int pop();       // remove the last item and push back 
        public void stackIsFull();      // when stack is full call
    }

    public static class Stack implements StackInterFace {

        private int length = 0; // length of stack
        

        private int[] stack;
        private int top = -1;


        // constactor
        public Stack (int length ){
            this.length = length;
            stack = new int[length];
        }

        //gettr for stack
        public int[] getStack(){
            return stack;
        }


        @Override
        public boolean push(int item) {
            if (top >= length-1 ){
                stackIsFull();
                return false;
            }
            top++;
            stack[top] = item;
            return true;
        }

        @Override
        public int pop() {
            if (top==-1){
                return -1;
            }
            int item = stack[top];
            stack[top] = 0;
            top--;
            return item;// first return the top and then  (top -1 )
        }

        @Override
        public void stackIsFull() {
            System.err.println("Stack is full.");
        }

    }
}