Hand trace a stack X through the following operations:

Question

```
X.push(new Integer(4));
X.push(new Integer(3));
Integer Y = X.pop();
X.push(new Integer(7));
X.push(new Integer(2));
X.push(new Integer(5));
X.push(new Integer(9));
Integer Y = X.pop();
X.push(new Integer(3));
X.push(new Integer(9));
```

Answer 1

The stack, after each operation (top of stack on the left):
4
3 4
4
7 4
2 7 4
5 2 7 4
9 5 2 7 4
5 2 7 4
3 5 2 7 4
9 3 5 2 7 4