好吧，我再次在这里问一个假的问题。我有一个自定义对话框框，上面有进度栏。所以我也有一个遗传算法(工作时间非常长)。
据我所知，我需要为算法，进度条执行单独的线程，并在对话框中保留主线程(以便他有机会响应用户的操作)。因此，我尝试实现了这一点，并获得了以下信息:
public class ScheduleDialog extends JDialog {
private final JPanel contentPanel = new JPanel();
private static Data data;
private static GeneticEngine geneticEngine;
private static Schedule schedule;
private static JProgressBar progressBar;
private static JLabel statusLabel;
public static void showProgress() {
try {
ScheduleDialog dialog = new ScheduleDialog();
dialog.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
dialog.setVisible(true);
startScheduleComposing();
} catch (Exception e) {
e.printStackTrace();
}
}
private static void startScheduleComposing() {
BackGroundWorker backGroundWorker = new BackGroundWorker();
GeneticEngineWorker geneticEngineWorker = new GeneticEngineWorker();
new Thread(geneticEngineWorker).start();
new Thread(backGroundWorker).start();
}
private ScheduleDialog() {
this.data = Data.getInstance();
setTitle("");
setModal(true);
setBounds(100, 100, 405, 150);
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension dialogSize = getSize();
setLocation((screenSize.width - dialogSize.width) / 2, (screenSize.height - dialogSize.height) / 2);
getContentPane().setLayout(new BorderLayout());
contentPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
getContentPane().add(contentPanel, BorderLayout.CENTER);
contentPanel.setLayout(new GridLayout(0, 1, 0, 0));
{
progressBar = new JProgressBar();
progressBar.setBackground(Color.RED);
contentPanel.add(progressBar);
}
{
statusLabel = new JLabel("");
contentPanel.add(statusLabel);
}
{
JPanel buttonPane = new JPanel();
buttonPane.setLayout(new FlowLayout(FlowLayout.RIGHT));
getContentPane().add(buttonPane, BorderLayout.SOUTH);
{
JButton okButton = new JButton("Прервать");
okButton.setActionCommand("OK");
buttonPane.add(okButton);
getRootPane().setDefaultButton(okButton);
}
}
}
protected static class BackGroundWorker implements Runnable {
@Override
public void run() {
while(true){
int barValue = 100 - (geneticEngine.getCurrentBestFitness() / geneticEngine.getInitialFitness());
progressBar.setValue(barValue);
progressBar.repaint();
statusLabel.setText(String.valueOf(geneticEngine.getCurrentBestFitness()));
statusLabel.repaint();
try{
Thread.sleep(10000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
protected static class GeneticEngineWorker implements Runnable{
@Override
public void run() {
geneticEngine = new GeneticEngine(data);
schedule = geneticEngine.GeneticAlgorithm();
}
}
}
看来
new Thread(geneticEngineWorker).start();可以正常工作，但是进度条什么也没发生。我认为这部分代码:private static void startScheduleComposing() {
BackGroundWorker backGroundWorker = new BackGroundWorker();
GeneticEngineWorker geneticEngineWorker = new GeneticEngineWorker();
new Thread(geneticEngineWorker).start();
new Thread(backGroundWorker).start();
}
只有在
new Thread(backGroundWorker).start();停止后，我们才会执行new Thread(geneticEngineWorker).start();。所以，如果我是对的，您能告诉我如何重组代码以完成工作吗？如果我错了，您可以指出我的错误吗？
提前谢谢大家!
添加
我调试了它，并且我以为，backGroundWorker仅在GeneticEngineWorker结束或用户关闭对话框后才开始工作(在这种情况下为异常(exception))；
最佳答案
是的，有两种基本的使用方法
SwingWorker，需要有关Java Essential Classes inc。的最深入的知识。也是Generics
和Runnable#Thread只需要将输出到GUI的包装成invokeLater()
一个简单的示例，不需要对Runnable#Thread，JProgressBar全部包含在JTable中进行任何特殊工作，这意味着应该将代码行model.setValueAt(value, row, column);包装到invokeLater中，但在另一方面，setText()被声明为线程安全的，我建议将其全部包装到invokeLater中案件
import java.awt.Component;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingUtilities;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
public class TableWithProgressBars {
private static final int maximum = 100;
public void createGUI() {
final JFrame frame = new JFrame("Progressing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Integer[] oneRow = {0, 0, 0, 0};
String[] headers = {"One", "Two", "Three", "Four"};
Integer[][] data = {oneRow, oneRow, oneRow, oneRow, oneRow,};
final DefaultTableModel model = new DefaultTableModel(data, headers);
final JTable table = new JTable(model);
table.setDefaultRenderer(Object.class, new ProgressRenderer(0, maximum));
table.setPreferredScrollableViewportSize(table.getPreferredSize());
frame.add(new JScrollPane(table));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
new Thread(new Runnable() {
@Override
public void run() {
Object waiter = new Object();
synchronized (waiter) {
int rows = model.getRowCount();
int columns = model.getColumnCount();
Random random = new Random(System.currentTimeMillis());
boolean done = false;
while (!done) {
int row = random.nextInt(rows);
int column = random.nextInt(columns);
Integer value = (Integer) model.getValueAt(row, column);
value++;
if (value <= maximum) {
model.setValueAt(value, row, column);
try {
waiter.wait(15);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
done = true;
for (row = 0; row < rows; row++) {
for (column = 0; column < columns; column++) {
if (!model.getValueAt(row, column).equals(maximum)) {
done = false;
break;
}
}
if (!done) {
break;
}
}
}
frame.setTitle("All work done");
}
}
}).start();
}
public static class ProgressRenderer extends JProgressBar implements TableCellRenderer {
private static final long serialVersionUID = 1L;
public ProgressRenderer(int min, int max) {
super(min, max);
this.setStringPainted(true);
}
@Override
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
this.setValue((Integer) value);
return this;
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new TableWithProgressBars().createGUI();
}
});
}
}