我希望每次点击“bouton”按钮执行功能
boutonPane.Panel2（h，....），它应该显示h个圆圈。所以我想2然后3然后4，然后5 ...圈。
问题是它没有显示数字4的步骤。我看到该功能在控制台中被调用，但在屏幕上它实际上是2，（按下按钮）3，（按下按钮）5，（按下按钮）9。我没看到4.我看不到6,7,8 ..你能告诉我有什么问题吗？这是代码：
public class Window extends JFrame implements ActionListener {
int lg = 1000; int lrg = 700;
int h = 2;
Panel b = new Panel();
private JButton btn = new JButton("Start");
JButton bouton = new JButton();
private JPanel container = new JPanel();
public Window(){
this.setTitle("Animation");
this.setSize(300, 300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
container.setBackground(Color.white);
container.setLayout(new BorderLayout());
JPanel top = new JPanel();
btn.addActionListener(this);
top.add(btn);
container.add(top);
this.setContentPane(container);
this.setVisible(true);
}
public void Window2()
{
System.out.println("windows2");
this.setTitle("ADHD");
this.setSize(lg, lrg);
this.setLocationRelativeTo(null);
bouton.addActionListener(this);
if(h<11)
{
Panel boutonPane = new Panel();
boutonPane.Panel2(h, Color.BLUE ,lg, lrg, this.getGraphics());
System.out.println("draw"+h);
boutonPane.add(bouton);
this.add(boutonPane);
this.setContentPane(boutonPane);
this.revalidate();
this.repaint();
}
this.setVisible(true);
}
public void actionPerformed(ActionEvent e)
{
if((JButton)e.getSource()==btn)
{
System.out.println("pressed0");
Window2();
}
if((JButton)e.getSource()==bouton)
{
h++;
System.out.println("pressed"+h);
Window2();
}
}
}
这是Panel类：
public class Panel extends JPanel
{
int m;
int i=1;
int a=0, b=0, tremp=0;
Color cc;
int lgi, lrgi;
int [] ta;
int [] tb;
Graphics gi;
int u=0;
Panel()
{
}
public void Panel2(int n, Color c, int lg, int lrg, Graphics g){
m=n;
cc=c;
gi=g;
lgi=lg;
lrgi=lrg;
ta = new int [n]; ta[0]=0;
tb = new int [n]; tb[0]=0;
}
public void paintComponent( final Graphics gr){
gr.setColor(Color.red);
for(int it=0; it<m;it++)
{
ta[it]=100*it;
tb[it]=100*it;
gr.fillOval(ta[it],tb[it], 150, 150);
}
}
}
答案 0 :(得分：2)
＆＃34;但是你会想到另一种正确的方法来做我想做的事吗？＆＃34;
您应该只为圈子设置一个面板。 绝对无需继续创建新面板。
对Ellipse2D个对象使用List。只需在paintComponent方法中循环使用它们。
如果您想添加新圈子，只需向Ellipse2D添加新的List对象，然后致电repaint()
以下是一个例子。
注意接受Gijs Overvliet的回答，因为他是回答你问题的人。我只是想分享一些见解。
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class EllipseList extends JPanel {
private static final int D_W = 700;
private static final int D_H = 500;
private static final int CIRCLE_SIZE = 50;
private List<Ellipse2D> circles;
private double x = 0;
private double y = 0;
private CirclePanel circlePanel = new CirclePanel();
public EllipseList() {
circles = new ArrayList<>();
JButton jbtAdd = createButton();
JFrame frame = new JFrame();
frame.add(jbtAdd, BorderLayout.NORTH);
frame.add(circlePanel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
private JButton createButton() {
JButton button = new JButton("Add");
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
circles.add(new Ellipse2D.Double(x, y, CIRCLE_SIZE, CIRCLE_SIZE));
x += CIRCLE_SIZE * 0.75;
y += CIRCLE_SIZE * 0.75;
circlePanel.repaint();
}
});
return button;
}
public class CirclePanel extends JPanel {
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D)g;
g2.setPaint(Color.RED);
for (Ellipse2D circle : circles) {
g2.fill(circle);
}
}
@Override
public Dimension getPreferredSize() {
return new Dimension(D_W, D_H);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new EllipseList();
}
});
}
}
答案 1 :(得分：1)
试试这个：
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Window extends JFrame implements ActionListener
{
int lg = 1000;
int lrg = 700;
int h = 2;
Panel b = new Panel();
private JButton btn = new JButton("Start");
JButton bouton = new JButton();
private JPanel container = new JPanel();
Panel boutonPane = new Panel();
public Window()
{
this.setTitle("Animation");
this.setSize(300, 300);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
container.setBackground(Color.white);
container.setLayout(new BorderLayout());
JPanel top = new JPanel();
btn.addActionListener(this);
top.add(btn);
container.add(top);
this.setContentPane(container);
this.setVisible(true);
}
public void Window2()
{
System.out.println("windows2");
this.setTitle("ADHD");
this.setSize(lg, lrg);
this.setLocationRelativeTo(null);
bouton.addActionListener(this);
if (h < 11)
{
boutonPane.Panel2(h, Color.BLUE, lg, lrg, this.getGraphics());
System.out.println("draw" + h);
boutonPane.add(bouton);
this.add(boutonPane);
this.setContentPane(boutonPane);
updateWindow2();
}
this.setVisible(true);
}
public void updateWindow2()
{
boutonPane.Panel2(h, Color.BLUE, lg, lrg, this.getGraphics());
this.revalidate();
this.repaint();
}
public void actionPerformed(ActionEvent e)
{
if ((JButton) e.getSource() == btn)
{
System.out.println("pressed0");
Window2();
}
if ((JButton) e.getSource() == bouton)
{
h++;
System.out.println("pressed" + h);
updateWindow2();
}
}
public static void main(String[] args)
{
Test t = new Test();
}
}
你做错了是每次点击按钮都添加一个新的BoutonPane。下次单击该按钮时，您没有单击“一个”按钮，而是单击两个按钮，再添加两个boutonPanes，再单击两个按钮。这很快就成倍增加。
我做的是以下内容：