为什么未创建这些JButton？

Question

I used Java graphics to create a 500 x 500 Checkers board within a JPanel, which was placed within a JFrame. To make the pieces, I wrote a series of for loops to create JButtons across the board. The following for loops correctly set up the pieces for one side of the board:

    for(int x = 355; x>=55;x-=100)
    {
     Piece p = new Piece();


     p.addActionListener(new ButtonListener());


     p.setBounds(x,5,40,40);

     b.add(p);
    }

    for(int x = 5;x<=355; x+=100)
    {
        Piece p = new Piece();
        p.addActionListener(new ButtonListener());
        p.setBounds(x,55,40,40);
        b.add(p);

    }


     for(int x = 355; x>=55;x-=100)
    {
     Piece p = new Piece();
     p.addActionListener(new ButtonListener());
     p.setBounds(x,105,40,40);
     b.add(p);
    }

However, I just started setting up the pieces for the other side of the board with this for loop, and none of the buttons are being displayed:

     for(int x = 5; x>=355;x+=100)
    {
     Piece p = new Piece();


     p.addActionListener(new ButtonListener());


     p.setBounds(x,255,40,40);

     b.add(p);
    }

Why is this happening?

Answer 1

The loop

for (int x = 5; x >= 355; x += 100) {
    ... 
}

won't ever be entered.

You are setting x to 5 . Then, you are checking if x >= 355 , which will be false because 5 is not >= 355 .