当我要着色的JButton名称在字符串中时，如何更改JButton的颜色？

Question

我设置了随机数方法和随机颜色方法。 我有28个按钮，它们都命名为button_number。 随机数选择按钮。 我有一些基本的代码显然不起作用，因为我无法更改字符串的背景，但是我不知道从这里去哪里。

static Random random = new Random();
static int rand1 = RandomRange.showRandomInteger(1, 28, random);
static String num = Integer.toString(rand1);
static String button = ("button_" + num);

button.setBackground(randomColor());

其他班级

public class TestFrame extends JFrame {

private JPanel contentPane;

/**
 * Launch the application.
 */
public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                TestFrame frame = new TestFrame();
                frame.setVisible(true);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });
}

/**
 * Create the frame.
 */
public TestFrame() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds(100, 100, 450, 300);
    contentPane = new JPanel();
    contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
    contentPane.setLayout(new BorderLayout(0, 0));
    setContentPane(contentPane);

    JLayeredPane layeredPane = new JLayeredPane();
    contentPane.add(layeredPane, BorderLayout.CENTER);

    JButton btnTick = new JButton("Tick");
    btnTick.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
        }
    });
    btnTick.setBounds(281, 217, 133, 23);
    layeredPane.add(btnTick);

    JButton btnStart = new JButton("Start");
    btnStart.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
        }
    });
    btnStart.setBounds(10, 217, 133, 23);
    layeredPane.add(btnStart);


    JButton button_27 = new JButton("");
    button_27.setBounds(0, 0, 45, 45);
    layeredPane.add(button_27);

    JButton button_28 = new JButton("");
    button_28.setBackground(Color.RED);
    button_28.setBounds(45, 0, 45, 45);
    layeredPane.add(button_28);

    JButton button_1 = new JButton("");
    button_1.setBounds(90, 0, 45, 45);
    layeredPane.add(button_1);

    JButton button_2 = new JButton("");
    button_2.setBounds(135, 0, 45, 45);
    layeredPane.add(button_2);

    JButton button_3 = new JButton("");
    button_3.setBounds(180, 0, 45, 45);
    layeredPane.add(button_3);

    JButton button_4 = new JButton("");
    button_4.setBounds(225, 0, 45, 45);
    layeredPane.add(button_4);

    JButton button_5 = new JButton("");
    button_5.setBounds(270, 0, 45, 45);
    layeredPane.add(button_5);

    JButton button_6 = new JButton("");
    button_6.setBounds(270, 45, 45, 45);
    layeredPane.add(button_6);

    JButton button_7 = new JButton("");
    button_7.setBounds(0, 45, 45, 45);
    layeredPane.add(button_7);

    JButton button_8 = new JButton("");
    button_8.setBounds(225, 45, 45, 45);
    layeredPane.add(button_8);

    JButton button_9 = new JButton("");
    button_9.setBounds(45, 45, 45, 45);
    layeredPane.add(button_9);

    JButton button_10 = new JButton("");
    button_10.setBounds(90, 45, 45, 45);
    layeredPane.add(button_10);

    JButton button_11 = new JButton("");
    button_11.setBounds(135, 45, 45, 45);
    layeredPane.add(button_11);

    JButton button_12 = new JButton("");
    button_12.setBounds(180, 45, 45, 45);
    layeredPane.add(button_12);

    JButton button_13 = new JButton("");
    button_13.setBounds(0, 135, 45, 45);
    layeredPane.add(button_13);

    JButton button_14 = new JButton("");
    button_14.setBounds(0, 90, 45, 45);
    layeredPane.add(button_14);

    JButton button_15 = new JButton("");
    button_15.setBounds(45, 90, 45, 45);
    layeredPane.add(button_15);

    JButton button_16 = new JButton("");
    button_16.setBounds(45, 135, 45, 45);
    layeredPane.add(button_16);

    JButton button_17 = new JButton("");
    button_17.setBounds(90, 135, 45, 45);
    layeredPane.add(button_17);

    JButton button_18 = new JButton("");
    button_18.setBounds(90, 90, 45, 45);
    layeredPane.add(button_18);

    JButton button_19 = new JButton("");
    button_19.setBounds(135, 90, 45, 45);
    layeredPane.add(button_19);

    JButton button_20 = new JButton("");
    button_20.setBounds(135, 135, 45, 45);
    layeredPane.add(button_20);

    JButton button_21 = new JButton("");
    button_21.setBounds(180, 135, 45, 45);
    layeredPane.add(button_21);

    JButton button_22 = new JButton("");
    button_22.setBounds(180, 90, 45, 45);
    layeredPane.add(button_22);

    JButton button_23 = new JButton("");
    button_23.setBounds(225, 90, 45, 45);
    layeredPane.add(button_23);

    JButton button_24 = new JButton("");
    button_24.setBounds(225, 135, 45, 45);
    layeredPane.add(button_24);

    JButton button_25 = new JButton("");
    button_25.setBounds(270, 135, 45, 45);
    layeredPane.add(button_25);

    JButton button_26 = new JButton("");
    button_26.setBounds(270, 90, 45, 45);
    layeredPane.add(button_26);

    final JButton[] BUTTONS = {button_1,button_2,button_3,button_4,button_5,button_6,button_7,
            button_8,button_9,button_10,button_11,button_12,button_13,button_14,button_15,
            button_16,button_17,button_18,button_19,button_20,button_21,button_22,button_23,
            button_24,button_25,button_26,button_27,button_28};



    JLabel label = new JLabel("Blue:");
    label.setBounds(325, 11, 89, 14);
    layeredPane.add(label);

    JLabel label_1 = new JLabel("Yellow:");
    label_1.setBounds(325, 36, 89, 14);
    layeredPane.add(label_1);

    JLabel label_2 = new JLabel("Red:");
    label_2.setBounds(325, 61, 89, 14);
    layeredPane.add(label_2);
}

}

Answer 1

按钮的名称是按钮的标签。 将按钮保留在一个集合中。 遍历集合，以将按钮的.getName（）与您的字符串匹配。 然后调用按钮的setBackgroundColor更改按钮颜色。

Answer 2

将颜色代码作为字符串传递给红色，例如使用红色：button.setBackgroundColor（Color.parseColor（“＃ff0000”））; 或button.setBackground（Color.parseColor（“＃ff0000”））;

Answer 3

将所有按钮放入数组或List 。 计算随机数时，请在列表/数组中查找按钮并更改其Color属性