Question

我刚刚开始编写课程2，它与我们以前的入门课程相比有了很大的提升。我要制作一个有三个按钮“红色”，“蓝色”，“绿色”的程序，当我点击“红色”时，会出现一个红色正方形。当我点击另一个按钮时，会有更多的正方形，正方形的颜色取决于我按下的按钮。我的问题是，当我按下“红色”时，我必须在红色方块出现之前按另一个按钮。所以实际上看起来我按下的按钮会连接到错误的动作。这很难描述，但就像“一举一动”一样。你能提供像我这样的新手任何帮助吗？我总共有树类：SquareIcon，CompositeIcon和带框架的测试器。只需要查看我在这里粘贴的最后一个课程。

import javax.swing.*;
import java.awt.*;
import java.awt.geom.Rectangle2D;

/**
 * Made by   Rasmus
 * Version   13-11-2014.
 */
public class SquareIcon implements Icon{
    private int size;
    private Color color;

public SquareIcon(int size, Color color) {
    this.size = size;
    this.color = color;
}

public void paintIcon(Component c, Graphics g, int x, int y) {
    Graphics2D g2 = (Graphics2D) g;
    Rectangle2D rec = new Rectangle2D.Double(x, y, size, size);
    g2.fill(rec);
    g2.setColor(color);
}

public int getIconWidth() {
    return size;
}

public int getIconHeight() {
    return size;
}

}

import javax.swing.*;
import java.awt.*;
import java.util.ArrayList;

/**
 * Made by   Rasmus
 * Version   13-11-2014.
 */
public class CompositeIcon implements Icon {
    private ArrayList<Icon> icons;

public CompositeIcon() {
    icons = new ArrayList<Icon>();
}

public void paintIcon(Component c, Graphics g, int x, int y) {
    for (Icon i : icons) {
        i.paintIcon(c, g, x, y);
        x += i.getIconWidth();
    }
}

public int getIconWidth() {
    int width = 0;
    for (Icon i : icons) {
        width += i.getIconWidth();
    }
    return width;
}

public int getIconHeight() {
    int height = 0;
    for (Icon i : icons) {
        if (i.getIconHeight() > height) {
            height = i.getIconHeight();
        }
    }
    return height;
}

public void addIcon(Icon i) {
    icons.add(i);
}
}

最后一次：

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * Made by   Rasmus
 * Version   13-11-2014.
 */
public class FrameTest implements ActionListener {
    public static void main(String[] args) {
        final JFrame frame = new JFrame();
        frame.setLayout(new FlowLayout());

    JButton redButton = new JButton("Rød");
    JButton greenButton = new JButton("Grøn");
    JButton blueButton = new JButton("Blå");
    frame.add(redButton);
    frame.add(greenButton);
    frame.add(blueButton);

    final CompositeIcon ci = new CompositeIcon();
    final SquareIcon red = new SquareIcon(50, Color.RED);
    final SquareIcon green = new SquareIcon(50, Color.GREEN);
    final SquareIcon blue = new SquareIcon(50, Color.BLUE);
    JLabel squareLabel = new JLabel(ci);
    frame.add(squareLabel);

    redButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            ci.addIcon(red);
            frame.pack();
            frame.repaint();
        }
    });
    greenButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            ci.addIcon(green);
            frame.pack();
            frame.repaint();
        }
    });
    blueButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            ci.addIcon(blue);
            frame.pack();
            frame.repaint();
        }
    });
    frame.setSize(250, 75);
    frame.setVisible(true);
}


public void actionPerformed(ActionEvent e) {

}
}

Answer 1

我建议两件事：

首先，我建议您删除最后执行的操作块。该块可能导致错误。

其次，如果没有导致错误，请尝试插入断点或打印语句以查看它何时进入执行动作循环，然后您可以从那里开始工作。

单击我的JButton但是没有显示之前显示的操作我使用ActionListener单击我的JFrame中的另一个按钮？

1 个答案: