Implement the empty(), push(int x), and pop() function for Stack

***post screen shots please****

package ds;

public class Stack {

public int size;

public int top;

public int[] array;

public Stack () {

size = 0;

top = -1;

array = null;

}

public Stack (int _size) {

size = _size;

top = -1;

array = new int[size];

}

/*

* Implement the Stack-Empty(S) function

*/

public boolean empty () {

}

/*

* Implement the Push(S, x) function

*/

public void push (int x) {

}

/*

* Implement the Pop(S) function

* Return -1 if the stack is empty

*/

public int pop () {

}

/*

* Convert stack to string in the format of #size, [#elements]

*/

public String toString () {

String str;

str = size + ", [";

for (int i = 0; i <= top; i++)

str += array[i] + ", ";

str += "]";

return str;

}

/**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

Stack s;

s = new Stack(10);

for (int i = 0; i < 5; i++)

s.push(i);

System.out.println(s.toString());

for (int i = 0; i < 2; i++)

s.pop();

System.out.println(s.toString());

}

}