Question

在这段代码中，我试图在按下按钮时进行文本更新，但它似乎没有更新，即使变量的值在按下按钮时发生了变化。这是代码：

public class Test extends Applet implements ActionListener
{
    Button Clicker;
    int CurrentClicks = 0;

    public void init()
    {
        this.setSize(600,400);

        Button Clicker = new Button("Button 1");
        add(Clicker);
        Clicker.addActionListener(this);

    }
    public void paint (Graphics g)
    {
        g.drawString("Test",300,50);
        g.drawString(String.valueOf(CurrentClicks), 300, 100);
    }
    public void actionPerformed(ActionEvent ae) 
    {
        System.out.println("Button 1 was pressed");
        CurrentClicks++;
        System.out.println("Current Clicks: "+CurrentClicks);
    }
 }

Answer 1

修改实例变量后，需要通过调用repaint()来刷新容器。

@Override
public void actionPerformed(ActionEvent ae) {
    System.out.println("Button 1 was pressed");
    CurrentClicks++;
    System.out.println("Current Clicks: " + CurrentClicks);
    repaint();
}

另外，请熟悉Java naming conventions。例如，建议您将实例变量CurrentClicks命名为currentClicks。

Java Applet中的文本更新

1 个答案: