JPanels没有出现，有点

Question

I am an in-school amateur making a snake game in java, it is not complete and i have run into a problem that i cant seem to fix. the first and second parts of the body show up just fine after eating the target, but after that they do not.

code that adds a body part:

  public void addBody(int x, int y) {
    snekBody.add(new JPanel());
    snekBody.get(snekBody.size() - 1).setBackground(new Color(new Random().nextInt(255), new Random().nextInt(255), new Random().nextInt(255)));
    snekBody.get(snekBody.size() - 1).setVisible(true);
    snekBody.get(snekBody.size() - 1).setBounds(x*score, y*score, BODY_WIDTH, BODY_HEIGHT);
    game.add(snekBody.get(this.snekBody.size() - 1));
    revalidate();
  }
}

code that moves the body parts(moveUp, moveDown, etc.:

public synchronized void moveRight(int x, int y) {
    timer++;
    while (!this.right) {
      try {
        wait();
      } catch (InterruptedException e) {
        e.printStackTrace();
      }
    }
    head.setBounds(x, y, 20, 20);
    xCoords.add(x);
    yCoords.add(y);
    //snekBody is an ArrayList of type JPanel
    for(int i = 0; i < snekBody.size(); i++) {
      if (i > 0) {
        snekBody.get(i).setBounds(xCoords.get(timer-(10*score)), yCoords.get(timer-(10*score))+5, BODY_WIDTH, BODY_HEIGHT);
      } else {
        snekBody.get(i).setBounds(xCoords.get(timer-10), yCoords.get(timer-10)+5, BODY_WIDTH, BODY_HEIGHT);
      }
    }
    repaint();
    notifyAll();
    revalidate();
  }

code that calls addBody:

 if (snek.up) {
          snek.addBody(snek.xCoords.get(snek.timer-20), snek.yCoords.get(snek.timer-20));

the second picture is the snake when more than two targets have been eaten. the panels for the body just stop showing up. The first picture is the snake when two targets have been eaten

Answer 1

原来，这些面板彼此重叠显示，因此为什么我看不到它们。