Handling Button Clicks - STEP 4

In this chapter, we’ll add the functionality for players to place an X or O on a square when they click it.

To start, we need a way to track whose turn it is. Let’s create a private boolean variable called isXTurn. This variable will help us determine which symbol to display. If isXTurn is true, the button will display an X; otherwise, it will display an O. Initialize this variable as follows: