使用GUI在Array中的偶数元素和奇数元素之间进行交替

时间:2013-10-31 03:09:02

标签: java arrays swing user-interface jpanel

我正在尝试使用更多的GUI,但我遇到了问题。我有一系列JLabel。它们每个都包含1到0到7的数字。我通过将背景颜色从黑色变为绿色来使数字“亮起”。是否有任何方法可以使所有偶数“亮起”同时保持所有奇数变暗,反之亦然?我尝试使用计时器,但我的算法不能正常工作。下面是配置计时器的方法的代码。感谢

    public void configureAlternatingTimer() {
    if (this.timer != null) {
        this.timer.stop();
    }

    this.timer = new Timer(100, new ActionListener() {
        public void actionPerformed(ActionEvent evt) {

            for (int i = 0; i <= 8; i++) {
                if (i == 0 || i == 2 || i == 4 || i == 6) {
                    lights[1].setBackground(Color.black);
                    lights[3].setBackground(Color.black);
                    lights[5].setBackground(Color.black);
                    lights[7].setBackground(Color.black);
                    lights[i].setBackground(Color.green);
                }
                if (i == 1 || i == 3 || i == 5 || i == 7) {
                    lights[0].setBackground(Color.black);
                    lights[2].setBackground(Color.black);
                    lights[4].setBackground(Color.black);
                    lights[6].setBackground(Color.black);
                    lights[i].setBackground(Color.green);
                }
                if(i==8) {
                    return;
                }
            }

        }

    });
    this.timer.start();

}

此外,我正在尝试模拟一个“larson扫描仪”,它会点亮7然后再回到0然后重复。我可以让它从0到7,这只是我遇到麻烦的回归部分。感谢

2 个答案:

答案 0 :(得分:0)

删除for-loop,阻止事件调度线程处理repaint个请求

相反,每次调用actionPerformed方法时,请更新某种计数器,然后对其采取措施,例如......

this.timer = new Timer(100, new ActionListener() {
    private int sequence = 0;
    public void actionPerformed(ActionEvent evt) {
        if (sequence % 2 == 0) {
            lights[1].setBackground(Color.black);
            lights[3].setBackground(Color.black);
            lights[5].setBackground(Color.black);
            lights[7].setBackground(Color.black);
            lights[sequence].setBackground(Color.green);
        } else {
            lights[0].setBackground(Color.black);
            lights[2].setBackground(Color.black);
            lights[4].setBackground(Color.black);
            lights[6].setBackground(Color.black);
            lights[sequence].setBackground(Color.green);
        }

        sequence++;
        if (sequence > 7) {
            // This seems to be important...?
        }
    }
});

根据评论更新

这应该显示所有可能性或所有均衡......

Timer timer = new Timer(500, new ActionListener() {
    private int sequence = 0;
    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println(sequence + "; " + (sequence % 2));

        for (int index = 0; index < lights.length; index++) {

            if (index % 2 == 0 && sequence % 2 == 0 || index % 2 != 0 && sequence % 2 != 0) {
                lights[index].setBackground(Color.GREEN);
            } else {
                lights[index].setBackground(Color.BLACK);
            }

        }

        sequence++;
        if (sequence > 7) {
            sequence = 0;
        }
    }
});

答案 1 :(得分:0)

要确定您是偶数还是奇数,您应该考虑使用模数运算符%来确定数字是奇数还是偶数。模数将在分割后返回数字的余数。

For example:
    4 / 2 = 2r0
    5 / 2 = 2r1
    6 / 2 = 3r0
    7 / 2 = 3r1
    so on and so forth...

if(i % 2 == 0) {
    // even
} else {
    // odd
}