java nested for() loop throws ArrayIndexOutOfBoundsException
- by Mike
I'm working through a JPanel exercise in a Java book. I'm tasked with creating a 5x4 grid using GridLayout.
When I loop through the container to add panels and buttons, the first add() throws the OOB exception. What am I doing wrong?
package mineField;
import java.awt.*;
import javax.swing.*;
@SuppressWarnings("serial")
public class MineField extends JFrame {
private final int WIDTH = 250;
private final int HEIGHT = 120;
private final int MAX_ROWS = 5;
private final int MAX_COLUMNS = 4;
public MineField() {
super("Minefield");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container mineFieldGrid = getContentPane();
mineFieldGrid.setLayout(new GridLayout(MAX_ROWS, MAX_COLUMNS));
// loop through arrays, add panels, then add buttons to panels.
for (int i = 0; i < MAX_ROWS; i++) {
JPanel[] rows = new JPanel[i];
mineFieldGrid.add(rows[i], rows[i].getName());
rows[i].setBackground(Color.blue);
for (int j = 0; j < MAX_COLUMNS; j++) {
JButton[] buttons = new JButton[i];
rows[i].add(buttons[j], buttons[j].getName());
}
}
mineFieldGrid.setSize(WIDTH, HEIGHT);
mineFieldGrid.setVisible(true);
}
public int setRandomBomb(Container con)
{
int bombID;
bombID = (int) (Math.random() * con.getComponentCount());
return bombID;
}
/**
* @param args
*/
public static void main(String[] args) {
//int randomBomb;
//JButton bombLocation;
MineField minePanel = new MineField();
//minePanel[randomBomb] = minePanel.setRandomBomb(minePanel);
}
}
I'm sure I'm over-engineering a simple nested for loop. Since I'm new to Java, please be kind. I'm sure I'll return the favor some day.
