我的程序应该在对话中创建圆圈图标。 我有三个按钮,每个按钮代表要制作的图标的颜色。 所以,如果我在各种按钮上单击10次,我的程序应该创建10个不同颜色的圆圈。 这是我的代码,有两个类:
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CompositeIcon extends JFrame {
static CircleIcon icon;
public static void main(String[] args) {
final JFrame frame = new JFrame();
final JLabel label = new JLabel();
JButton redBut = new JButton("Red");
JButton blueBut = new JButton("Blue");
JButton greenBut = new JButton("Green");
icon = new CircleIcon();
redBut.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
icon.addIcon(new CircleIcon(50, Color.red));
label.setIcon(icon);
frame.repaint();
frame.pack();
}
});
blueBut.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
icon.addIcon(new CircleIcon(50, Color.blue));
label.setIcon(icon);
frame.repaint();
frame.pack();
}
});
greenBut.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
icon.addIcon(new CircleIcon(50, Color.green));
label.setIcon(icon);
frame.repaint();
frame.pack();
}
});
frame.setLayout(new FlowLayout());
label.setPreferredSize(new Dimension(400, 200));
frame.add(redBut);
frame.add(blueBut);
frame.add(greenBut);
frame.add(label);
frame.pack();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
我的另一堂课:
import java.util.*;
import java.awt.*;
import javax.swing.*;
public class CircleIcon implements Icon {
private ArrayList<Icon> icons;
private int width;
private int height;
public CircleIcon() {
icons = new ArrayList<Icon>();
}
public void addIcon(Icon icon) {
icons.add(icon);
width += icon.getIconWidth();
int iconHeight = icon.getIconHeight();
if (height < iconHeight)
height = iconHeight;
}
public int getIconHeight() {
return height;
}
public int getIconWidth() {
return width;
}
public void paintIcon(Component c, Graphics g, int x, int y) {
for (Icon icon : icons) {
icon.paintIcon(c, g, x, y);
x += icon.getIconWidth();
}
}
}
此时我的程序甚至不会编译,问题出在CompositeIcon-class中,
在icon.addIcon(new CircleIcon(50, Color.red));
处为“红色按钮”,而在蓝色和绿色处则相同。
答案 0 :(得分:1)
我测试了你的代码。您的CircleIcon类缺少构造函数。将其添加到您的圈子图标类。
public CircleIcon(int number, Color awtColor) {
// do whatever here
}