Question

我正在创建一个Swing应用程序。我创建了一个名为Drone的类，并在另一个名为UserAccount的类中创建了它的对象。在JButton我使用userAccount调用Drone类的getter但没有执行任何操作。为什么会这样？

这是Drone类的代码

private int x;
private int y;
private String text;
private int a;
private int b;
private String text1;
private int c;
private int d;
private String text2;

public Drone() {
x= 10;
y=150;
a=10;
b=150;
c=1000;
d=150;
text="Drone";
text1="Factory";
text2="Hospital";
    setSize(1070,300);
}

@Override
public void paint(Graphics g) {
    g.setColor(Color.white);
    g.fillRect(0, 0, 1070, 300);
    g.setColor(Color.BLACK);
    g.drawString(text, x, y);
    System.out.println(x + "" + y);

    g.drawString(text1, a, b);

    g.drawString(text2, c, d);

}

public void factory() throws InterruptedException{
    while(true){
        while(a<=getWidth()){
            b=getHeight()/2;
            repaint();
            Thread.sleep(1000000);
        }
    }
}

public void Hospital() throws InterruptedException{
    while(true){
        while(c<=getWidth()){
            d=getHeight()/2;
            repaint();
            Thread.sleep(1000000);
        }
    }
}

public void start() throws InterruptedException{
    while(true){
        while(x <= getWidth()-50){
            x++;
            y = getHeight()/2;
            repaint();
            Thread.sleep(150);
        }
        while(x >= 0){
            x--;
            y = getHeight()/2;
            repaint();
            Thread.sleep(150);
        }
        break;
    }
}

public static void main(String[] args) throws InterruptedException{
    JFrame frame = new JFrame("Drone Movement");
    frame.setDefaultCloseOperation(JFrame.HIDE_ON_CLOSE);
    Drone drone = new Drone();
    frame.getContentPane().add(drone);
    frame.setSize(1070,300);
    frame.setLocation(180,200);
    frame.setVisible(true);
    drone.start();
    drone.factory();
    drone.Hospital();
}

我在actionPerformed

中的JButton JPanel致电此课程

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    userAccount.getDrone();

}

为什么这里没有采取任何行动？

Answer 1

我认为你缺少添加动作监听器。

在Drone类中，创建的JButton应该具有类似

的内容

JButton button = new JButton("button");
button.addActionListener(this);

Drone实现ActionListener。

但根据你所说的，JButton有actionPerformed我假设你正在扩展JButton来实现ActionListener并实现了actionPerformed方法，那么代码应该是

public class MyButton extends JButton implements ActionListener {
    public void actionPerformed(ActionEvent actionEvent) {
        //TODO implement your action here
    }

然后在您的无人机中，您应该有类似

的内容

MyButton button = new MyButton();
button.addActionListener(button); // the button itself instead of the this

单击jbutton时不执行任何操作

1 个答案: