Text not showing on my button at runtime
I am trying to code tic-tac-toe. I want the button to change to "X" when I click on it.
I'm not quite with my code.
But I want to see the button change text. But I don't see any changes.
SetText (); the method suits me. :)
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class tictac extends JFrame implements ActionListener{
JButton [][] game = new JButton[3][3];
JLabel head = new JLabel("Tic-Tac-Toe");
Font font = new Font("Time New Roman", Font.ITALIC, 20);
GridLayout grid = new GridLayout(3,3,0,0);
int row,column =0;
FlowLayout flow = new FlowLayout();
tictac(){
//setLayout(flow);
//add(head);
super("Tic-Tac-Toe");
setLayout(grid);
setVisible(true);
setDefaultCloseOperation(1);
setSize(500,500);
for (row =0; row<3;row++ ){
for(column =0; column <3;column++){
game[row][column]= new JButton("");
add(game[row][column]);
game[row][column].addActionListener(this);
}
}
}
public void actionPerformed(ActionEvent e){
Object source = e.getSource();
if (source == game[row][column])
game[row][column].setText("X");
System.out.println("X");
}
}
What am I doing wrong?
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You are using row
and incorrectly column
.
These values were updated (both are now 3) in your double loop when you created these JButtons.
When you access them again actionPerformed
, one problem is that it throws an ArrayIndexOutOfBoundsException.
Note. It's just a quick fix.
Declare # of rows (ROWS) and # of columns (COLS) as constants.
When the action is running, test each of these buttons with a double for loop.
Code:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class QuickTester {
public static void main (String [] args) {
TicTac tt = new TicTac();
}
}
class TicTac extends JFrame implements ActionListener{
JButton [][] game = new JButton[3][3];
JLabel head = new JLabel("Tic-Tac-Toe");
Font font = new Font("Time New Roman", Font.ITALIC, 20);
GridLayout grid = new GridLayout(3,3,0,0);
FlowLayout flow = new FlowLayout();
static final int ROWS = 3;
static final int COLS = 3;
TicTac(){
//setLayout(flow);
//add(head);
super("Tic-Tac-Toe");
setLayout(grid);
setVisible(true);
setDefaultCloseOperation(1);
setSize(500,500);
for (int row = 0; row < ROWS; row++ ){
for(int col = 0; col < COLS; col++){
game[row][col]= new JButton("");
add(game[row][col]);
game[row][col].addActionListener(this);
}
}
}
public void actionPerformed(ActionEvent e){
Object source = e.getSource();
for(int row = 0; row < ROWS; row++) {
for(int col = 0; col < COLS; col++) {
if (source == game[row][col])
game[row][col].setText("X");
System.out.println("X");
}
}
}
}
Output:
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