Repaint() 从新线程调用时不起作用

Question

我想做一个排序动画。我有一个JFrame和GridLayout(1,3)，因为我有3个排序算法。在每个单元格中，我都有一个JPanel，带有BorderLayout()。在JPanel的中心，我有数字，每个数字都有一根不同宽度的棍子(我把它们水平放置)。对于每种类型的排序，我都需要一个线程来调用它们。因此，我创建了类SortThread来进行排序(它扩展了JThread。每对数字和棍子都用StickNumber类绘制在中央面板上，该类扩展了JLabel。问题是当我启动线程时。重新绘制()方法似乎不起作用。

这是SortThread类：

public class SortThread extends Thread{
private JPanel sortPanel;
private StickNumber[] listOfNumbers;
public SortThread(JPanel sortPanel)
{
this.sortPanel = sortPanel;
Component[] components = sortPanel.getComponents();
listOfNumbers = new StickNumber[components.length];
for(int i = 0; i<components.length; i++)
listOfNumbers[i] = (StickNumber) components[i];
}
public SortThread(){}
public void bubbleSort()
{
boolean swapped = true;
int j = 0;
StickNumber tmp;
while (swapped) {
swapped = false;
j++;
for (int i = 0; i < listOfNumbers.length - j; i++) {                                       
if (listOfNumbers[i].getValue() > listOfNumbers[i+1].getValue()) {                          
tmp = listOfNumbers[i];
listOfNumbers[i]=listOfNumbers[i+1];
listOfNumbers[i+1]=tmp;
swapped = true;
sortPanel.validate();
sortPanel.repaint();
}
}                
}
}
public void run(){
bubbleSort();
}

这是启动线程的按钮的监听器：

ActionListener sortListener = new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
if(sortFlag == false)
{
sortFlag = true;
SortThread thread1= new SortThread(centerPanel1);
thread1.start();
appFrame.validate();
appFrame.repaint();
}
}
};
sortButton.addActionListener(sortListener);

贴纸编号类别：

private void doDrawing(Graphics g) {  
Graphics2D g2 = (Graphics2D) g;
String number = Integer.toString(value);
if(dimension!=0)
setText(number);
g2.setStroke(new BasicStroke(5));
g2.draw(new Line2D.Float(dimension*10, 5, height+dimension*10, 5));
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
doDrawing(g);
}

Answer 1

使用SwingWorker，假设您的代码做了它应该做的事情，并且您的问题是EDT被阻止：

import java.awt.Component;
import java.util.List;
import javax.swing.*;
public class SortSwingWorker extends SwingWorker<Object, Object> {
private JPanel sortPanel;
private StickNumber[] listOfNumbers;
public SortSwingWorker(JPanel sortPanel) {
this.sortPanel = sortPanel;
Component[] components = sortPanel.getComponents();
listOfNumbers = new StickNumber[components.length];
for (int i = 0; i < components.length; i++) {
listOfNumbers[i] = (StickNumber) components[i];
}
}
@Override
protected Object doInBackground() throws Exception {
boolean swapped = true;
int j = 0;
StickNumber tmp;
while (swapped) {
swapped = false;
j++;
for (int i = 0; i < listOfNumbers.length - j; i++) {
if (listOfNumbers[i].getValue() > listOfNumbers[i + 1].getValue()) {
tmp = listOfNumbers[i];
listOfNumbers[i] = listOfNumbers[i + 1];
listOfNumbers[i + 1] = tmp;
swapped = true;
publish(null);
}
}
}
return null;
}
@Override
protected void process(List<Object> list) {
sortPanel.validate();
sortPanel.repaint();
}
//dummy class
private class StickNumber extends Component {
public Integer getValue() {
return null;
}
}
}