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);
	}
}
//