Java JProgressBar没有';t更新,can';我找不到线索
干得好,现在我只想知道为什么我在下面的指令System.out.println中添加while循环,Gui中的cmd和Pgbar都会显示进度??:Java JProgressBar没有';t更新,can';我找不到线索,java,multithreading,oracle,swing,jprogressbar,Java,Multithreading,Oracle,Swing,Jprogressbar,干得好,现在我只想知道为什么我在下面的指令System.out.println中添加while循环,Gui中的cmd和Pgbar都会显示进度??: while(progress < 99){ System.out.println("into while of PBar Thread progress = "+progress); if(progress != Path.operationProgress){ operationProgressBar.setValue(
while(progress < 99){
System.out.println("into while of PBar Thread progress = "+progress);
if(progress != Path.operationProgress){
operationProgressBar.setValue(progress);
progress = Path.operationProgress;
operationProgressBar.repaint(); } }
{线程sa=新线程(){ @凌驾 公开募捐{ 结果=p.模拟退火(邻域型); String lastCostString=result.Cost()+“”; lastCostLabel.setText(lastCostString); }}; sa.start(); Pbar pb=新的Pbar(操作进度条); pb.start(); } //其他一些东西。。。 }
如果您不能使用
SwingWorker
,请使用SwingUtilities.invokeLater
,例如:
if (progress != Path.operationProgress) {
final int progressCopy = progress; // Probably not final so copy is needed
SwingUtilities.invokeLater(new Runnable() {
@Override
void run() {
operationsProgressBar.setValue(progressCopy);
}
});
}
注意:执行此操作时,run
中使用的所有内容都必须是最终的,或者必须有其他度量来访问变量。这一准则在这方面具有象征意义
您需要在事件调度线程之外对Swing组件执行操作,这是无法解决的。我将使用PropertyChangeListener使退火进度值成为类的“绑定”属性。如果需要,任何观察者都可以遵循此属性。例如:
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;
import javax.swing.event.SwingPropertyChangeSupport;
@SuppressWarnings("serial")
public class TspGui2 extends JPanel {
private static final String ANNEALING_PROGRESS = "Annealing Progress";
private JProgressBar progBar = new JProgressBar(0, 100);
private JLabel valueLabel = new JLabel();
private JButton beginAnnealingBtn = new JButton("Begin Annealing");
private MyAnnealing myAnnealing = new MyAnnealing(this);
public TspGui2() {
beginAnnealingBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
beginAnnealing();
}
});
myAnnealing.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if (evt.getPropertyName().equals(MyAnnealing.ANNEALING)) {
// be sure this is done on the EDT
SwingUtilities.invokeLater(new Runnable() {
public void run() {
int annealedValue = myAnnealing.getAnnealedValue();
setValue(annealedValue);
if (annealedValue >= MyAnnealing.MAX_ANNEALED_VALUE) {
beginAnnealingBtn.setEnabled(true);
}
}
});
}
}
});
progBar.setString(ANNEALING_PROGRESS);
progBar.setStringPainted(true);
JPanel northPanel = new JPanel(new GridLayout(1, 0));
northPanel.add(beginAnnealingBtn);
northPanel.add(valueLabel);
setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
add(northPanel);
add(progBar);
}
public void setValue(int value) {
valueLabel.setText("Value:" + value);
progBar.setValue(value);
}
public void beginAnnealing() {
beginAnnealingBtn.setEnabled(false);
setValue(0);
myAnnealing.reset();
new Thread(new Runnable() {
public void run() {
myAnnealing.beginAnnealing();
}
}).start();
}
private static void createAndShowGui() {
TspGui2 mainPanel = new TspGui2();
JFrame frame = new JFrame("TspGui2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
class MyAnnealing {
public static final String ANNEALING = "Annealing";
public static final int MAX_ANNEALED_VALUE = 100;
private SwingPropertyChangeSupport propChangeSupport =
new SwingPropertyChangeSupport(this);
private TspGui2 gui;
private int annealedValue;
public MyAnnealing(TspGui2 gui) {
this.gui = gui;
}
public void addPropertyChangeListener(
PropertyChangeListener listener) {
propChangeSupport.addPropertyChangeListener(listener);
}
public void removePropertyChangeListener(
PropertyChangeListener listener) {
propChangeSupport.removePropertyChangeListener(listener);
}
public void reset() {
setAnnealedValue(0);
}
// simulate some long process...
public void beginAnnealing() {
long sleepDelay = 100;
while (annealedValue < MAX_ANNEALED_VALUE) {
setAnnealedValue(annealedValue + 1);
try {
Thread.sleep(sleepDelay);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public int getAnnealedValue() {
return annealedValue;
}
private void setAnnealedValue(int value) {
final int oldValue = this.annealedValue;
this.annealedValue = value;
propChangeSupport.firePropertyChange(ANNEALING, oldValue, annealedValue);
}
}
导入java.awt.GridLayout;
导入java.awt.event.ActionEvent;
导入java.awt.event.ActionListener;
导入java.beans.PropertyChangeEvent;
导入java.beans.PropertyChangeListener;
导入javax.swing.*;
导入javax.swing.event.SwingPropertyChangeSupport;
@抑制警告(“串行”)
公共类TspGui2扩展了JPanel{
私有静态最终字符串退火\u PROGRESS=“退火进度”;
私有JProgressBar progBar=新的JProgressBar(0100);
私有JLabel valueLabel=新JLabel();
私有JButton beginanealingbtn=新JButton(“开始退火”);
私有MyAnnealing MyAnnealing=新MyAnnealing(this);
公共TspGui2(){
beginanealingbtn.addActionListener(新ActionListener(){
@凌驾
已执行的公共无效操作(操作事件e){
beginanealing();
}
});
addPropertyChangeListener(新的PropertyChangeListener(){
@凌驾
公共作废属性更改(属性更改事件evt){
if(evt.getPropertyName().equals(MyAnnealing.ANNEALING)){
//确保这是在EDT上完成的
SwingUtilities.invokeLater(新的Runnable(){
公开募捐{
int annealedValue=myAnnealing.getAnnealedValue();
设定值(退火值);
if(退火值>=MyAnnealing.MAX\u退火值){
beginanealingbtn.setEnabled(true);
}
}
});
}
}
});
程序设置管柱(退火进度);
progBar.SetStringPaint(真);
JPanel northPanel=新JPanel(新网格布局(1,0));
northPanel.add(BeginAnalingBTN);
northPanel.add(valueLabel);
setLayout(新的BoxLayout(这是BoxLayout.PAGE_轴));
添加(北面板);
添加(progBar);
}
公共无效设置值(int值){
valueLabel.setText(“值:”+Value);
progBar.setValue(值);
}
公共无效开始清理(){
beginanealingbtn.setEnabled(false);
设定值(0);
myAnnealing.reset();
新线程(newrunnable()){
公开募捐{
myAnnealing.beginanealing();
}
}).start();
}
私有静态void createAndShowGui(){
TspGui2主面板=新的TspGui2();
JFrame=新JFrame(“TspGui2”);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(主面板);
frame.pack();
frame.setLocationByPlatform(真);
frame.setVisible(true);
}
公共静态void main(字符串[]args){
SwingUtilities.invokeLater(新的Runnable(){
公开募捐{
createAndShowGui();
}
});
}
}
类My退火{
公共静态最终字符串退火=“退火”;
公共静态最终int最大退火值=100;
私有SwingPropertyChangeSupport propChangeSupport=
新的SwingPropertyChangeSupport(此);
私有TspGui2图形用户界面;
私有内部退火价值;
公共图形用户界面(TspGui2 gui){
this.gui=gui;
}
public void addPropertyChangeListener(
PropertyChangeListener(侦听器){
propChangeSupport.addPropertyChangeListener(listener);
}
public void removePropertyChangeListener(
PropertyChangeListener(侦听器){
propChangeSupport.removePropertyChangeListener(监听器);
}
公共无效重置(){
设置退火值(0);
}
//模拟一些长过程。。。
公共无效开始清理(){
长睡眠延迟=100;
而(退火值<最大退火值){
设置退火值(退火值+1);
试一试{
睡眠(睡眠延迟);
}捕捉(中断异常e){
e、 printStackTrace();
}
}
}
public int getAnnealedValue(){
返回退火值;
}
私有void setAnnealedValue(int值){
最终int oldValue=此.annealedValue;
此参数为:退火值=数值;
propChangeSupport.firePropertyChange(退火、旧值、退火值);
}
}
尽管您很小心地尝试在后台线程中执行操作,但您的问题闻起来像是线程问题——或者是正在更新的JProgressBar不是正在显示的。但是,如果没有更多的代码,就很难说了。如果上面的代码是在后台线程上运行的,则必须注意在EDT上调用进度条setValue(…),尽管这不会解决问题,但可能会防止某些间歇性异常的发生。我建议您向我们展示更多的代码,最好是
if (progress != Path.operationProgress) {
final int progressCopy = progress; // Probably not final so copy is needed
SwingUtilities.invokeLater(new Runnable() {
@Override
void run() {
operationsProgressBar.setValue(progressCopy);
}
});
}
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.*;
import javax.swing.event.SwingPropertyChangeSupport;
@SuppressWarnings("serial")
public class TspGui2 extends JPanel {
private static final String ANNEALING_PROGRESS = "Annealing Progress";
private JProgressBar progBar = new JProgressBar(0, 100);
private JLabel valueLabel = new JLabel();
private JButton beginAnnealingBtn = new JButton("Begin Annealing");
private MyAnnealing myAnnealing = new MyAnnealing(this);
public TspGui2() {
beginAnnealingBtn.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
beginAnnealing();
}
});
myAnnealing.addPropertyChangeListener(new PropertyChangeListener() {
@Override
public void propertyChange(PropertyChangeEvent evt) {
if (evt.getPropertyName().equals(MyAnnealing.ANNEALING)) {
// be sure this is done on the EDT
SwingUtilities.invokeLater(new Runnable() {
public void run() {
int annealedValue = myAnnealing.getAnnealedValue();
setValue(annealedValue);
if (annealedValue >= MyAnnealing.MAX_ANNEALED_VALUE) {
beginAnnealingBtn.setEnabled(true);
}
}
});
}
}
});
progBar.setString(ANNEALING_PROGRESS);
progBar.setStringPainted(true);
JPanel northPanel = new JPanel(new GridLayout(1, 0));
northPanel.add(beginAnnealingBtn);
northPanel.add(valueLabel);
setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
add(northPanel);
add(progBar);
}
public void setValue(int value) {
valueLabel.setText("Value:" + value);
progBar.setValue(value);
}
public void beginAnnealing() {
beginAnnealingBtn.setEnabled(false);
setValue(0);
myAnnealing.reset();
new Thread(new Runnable() {
public void run() {
myAnnealing.beginAnnealing();
}
}).start();
}
private static void createAndShowGui() {
TspGui2 mainPanel = new TspGui2();
JFrame frame = new JFrame("TspGui2");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGui();
}
});
}
}
class MyAnnealing {
public static final String ANNEALING = "Annealing";
public static final int MAX_ANNEALED_VALUE = 100;
private SwingPropertyChangeSupport propChangeSupport =
new SwingPropertyChangeSupport(this);
private TspGui2 gui;
private int annealedValue;
public MyAnnealing(TspGui2 gui) {
this.gui = gui;
}
public void addPropertyChangeListener(
PropertyChangeListener listener) {
propChangeSupport.addPropertyChangeListener(listener);
}
public void removePropertyChangeListener(
PropertyChangeListener listener) {
propChangeSupport.removePropertyChangeListener(listener);
}
public void reset() {
setAnnealedValue(0);
}
// simulate some long process...
public void beginAnnealing() {
long sleepDelay = 100;
while (annealedValue < MAX_ANNEALED_VALUE) {
setAnnealedValue(annealedValue + 1);
try {
Thread.sleep(sleepDelay);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public int getAnnealedValue() {
return annealedValue;
}
private void setAnnealedValue(int value) {
final int oldValue = this.annealedValue;
this.annealedValue = value;
propChangeSupport.firePropertyChange(ANNEALING, oldValue, annealedValue);
}
}