问两个UI的基础性问题，顺便散分，帮顶有分

JToolTip 内添加 Html 标记就可以换行了,你可以自己试试!一个JFrame的JAVA程序，其contentPane上add了许多JPanel，拖动窗口出屏幕以后拖回来，被覆盖的部分没有被重画，应该重载哪些方法，JFrame.paintComponents()???JFrame 拖动后会调用 paint() 函数,重绘窗口,但这是自动的啊!
如果你在 JFrame 里使用的都是完整的(有自己的绘制功能)控件,它是会自己调用的,不用做任何的修改的.你的应该是代码本身出了问题,把代码贴出来看看就知道了.

解决方案 »

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我把相关代码贴出来，我跟终到原因，是我在一个JPanel中add了一个自定义的继承自JPanel的类实例
包含main()的文件package tri.dts.pf.monitor;import java.awt.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;/**
* Title: 
* Description: 
* Copyright: Copyright (c) 2004
* Company: 
* @author not attributable
* @version 1.0
*/public class UserIconPool extends JPanel {
 XYLayout xYLayout1 = new XYLayout(); Point firstIconPos = new Point(45,35);
 boolean placeRandom = false;
 int colCnt = 0;
 int rowCnt = 0; public UserIconPool() {
 try {
 jbInit();
 }
 catch (Exception ex) {
 ex.printStackTrace();
 }
 }
 private void jbInit() throws Exception {
 this.setLayout(xYLayout1);
 this.setBackground(Color.cyan);
 this.setBackground(MainDisp.USER_PANE_COLOR);
 this.add(new UserIcon(80),new XYConstraints(80,80,0,0));
 } public static void main(String[] argc) {
 JFrame frame = new JFrame();
 frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
 frame.setLocation(80,80);
 UserIconPool userIconPool = new UserIconPool();
 frame.setSize(600,600);
 Container contentPane = frame.getContentPane();
 contentPane.add(userIconPool,null);
 frame.setVisible(true);
 }
}相关文件UserIcon.java，我自己写的可拖动的一个对象
package tri.dts.pf.monitor;import java.awt.*;
import javax.swing.*;
import com.borland.jbcl.layout.*;
import java.awt.event.*;
import java.text.NumberFormat;
import com.borland.jbcl.layout.*;
import javax.swing.ToolTipManager;/**
* Title: 
* Description: 
* Copyright: Copyright (c) 2004
* Company: 
* @author not attributable
* @version 1.0
*/public class UserIcon
 extends JPanel {
 int seq; int curMouseX;
 int curMouseY;
 UserIconPool parent;
 JLabel jLabel1 = null;
 TextLabel jLabel2 = null;
 ImageIcon imageIcon1 = null;
 BoxLayout2 boxLayout21 = new BoxLayout2();
 String toolTipText = "<html>错误 没有设置正确的弹出信息</html>";
 UserIcons userIcons = UserIcons.getInstance(); ToolTipManager toolTipManager = ToolTipManager.sharedInstance();
 public UserIcon(int seq) {
 this.seq = seq;
 try {
 jbInit();
 }
 catch (Exception ex) {
 ex.printStackTrace();
 }
 } private void jbInit() {
 toolTipManager.registerComponent(this);
 this.setPreferredSize(new Dimension(100, 100));
 this.setLayout(boxLayout21);
 this.addMouseMotionListener(new this_Mouse_Motion_Adapter(this)); NumberFormat format = NumberFormat.getNumberInstance();
 format.setMinimumIntegerDigits(3); imageIcon1 = userIcons.getUserIcon((int)Math.floor(Math.random()*10));
 jLabel1 = new JLabel(imageIcon1);
 jLabel2 = new TextLabel("用户"+format.format(seq),12,new Point(0,0));
 jLabel2.setPreferredSize(new Dimension(45,15));
 boxLayout21.setAxis(BoxLayout.PAGE_AXIS);
 this.add(jLabel1, null);
 jLabel1.setAlignmentX(Component.CENTER_ALIGNMENT);
 this.add(jLabel2, null);
 jLabel2.setAlignmentX(Component.CENTER_ALIGNMENT);
 this.setPreferredSize(new Dimension(Math.max(imageIcon1.getIconWidth(),
 jLabel2.getPreferredSize().
 width),
 imageIcon1.getIconHeight() +
 jLabel2.getPreferredSize().height));
 this.setToolTipText(toolTipText);
 } public void mouseMovePerformed(MouseEvent e) {
 curMouseX = e.getX();
 curMouseY = e.getY();
 } public void mouseDraggedPerformed(MouseEvent e) {
 parent = (UserIconPool)getParent();
 int newMouseX = e.getX();
 int newMouseY = e.getY();
 Point nextPoint = null;
 Point newPoint = this.getLocation();
 if ( (newMouseX + newPoint.x) > parent.getWidth() ||
 (newMouseY + newPoint.y) > parent.getHeight() ||
 (newMouseX + newPoint.x) < 0 ||
 (newMouseY + newPoint.y) <0) {
 return;
 }
 nextPoint = new Point(newPoint.x + (newMouseX - curMouseX),
 newPoint.y + (newMouseY - curMouseY));
 UserIconPool pool = (UserIconPool) getParent();
 pool.remove(this);
 pool.add(this, new XYConstraints(nextPoint.x, nextPoint.y, 0, 0));
 this.revalidate();
 repaint();
 } public static void main(String[] argc) {
 JFrame frame = new JFrame();
 frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
 frame.setSize(200, 200);
 UserIcon userIcon = new UserIcon(5);
 frame.getContentPane().add(userIcon);
 frame.setVisible(true);
 }
}class this_Mouse_Motion_Adapter
 extends MouseMotionAdapter {
 private UserIcon adaptee;
 public this_Mouse_Motion_Adapter(UserIcon adaptee) {
 this.adaptee = adaptee;
 } public void mouseMoved(MouseEvent e) {
 adaptee.mouseMovePerformed(e);
 } public void mouseDragged(MouseEvent e) {
 adaptee.mouseDraggedPerformed(e);
 }
}
如果你覆盖了父类的方法，别忘了调用super.方法();在画图的时候经常出现这种问题。
代码太长，你自己看看吧
不会是机器慢吧？256MB/512MB流畅
我是IBM品牌机，3G的cpu，1G的内存，镭9500双头输出到双17'液晶
应该不是机器慢吧？我知道程序有问题，我在找原因。
IBM品牌机，3G的cpu，1G的内存,够酷
我对这个不怎么熟悉不过我觉得如果你覆盖了父类的方法，别忘了调用super.方法();在画图的时候经常出现这种问题。这个说的没错.
我找到原因了，在UserIcon.mouseDraggedPerformed(MouseEvent e)函数的最后一行调用了
repaint()函数，去掉就没有问题了。但是不太清楚为什么。