can we have two instructors simultaneously for the same method? what does this command : stack = new int[this.size] mean? I dont understand new int in this concept. How can I add print command to the "pop" method? because it can not be void.

the main: package StackPractice;

public class MainIntStack {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    IntStack stackno1 = new IntStack();
    // why get error?: The field IntStack.top is not visible
    // System.out.println(stackno1.top);
    if (!stackno1.isFull()) {
        stackno1.push(1);
        stackno1.push(2);

    }

    if (!stackno1.isEmpty()) {
        // stackno1.pop();
        // stackno1.pop();

        System.out.println(stackno1.pop());
    } else {
        System.out.println("stack is empty");

    }

}

}

The methods:

package StackPractice;

public class IntStack { private int[] stack; private int top; private int size;

// instructor to set default values // ca we have two constructor of the same method? public IntStack() { top = -1; size = 50; // stack = new int[50];

}

public IntStack(int size) {
    top = -1;
    this.size = size;
    //
    stack = new int[this.size];
}

//check if pushing value work properly thats why it is boolean public boolean push(int item) { if (!isFull()) { top++; stack[top] = item; return true; } else { return false; }

}

public boolean isFull() {
    // checks if top is equal to stack.length-1
    return (top == stack.length - 1);
}

public int pop() {
    if (!isEmpty())
    return stack[top--];
    else {
        return top;
        //why print can not be done?
        //System.out.println("The stack is already empty");
    }

}

public boolean isEmpty() {
//  if (top <= 0) {
    //  return true;
//  } else {
    //  return false;
    return (top==-1);
    }
}