我有2个课程.java
主要的 ：
public class Controller extends javax.swing.JFrame
{
public static void updateProgressBar(int i) {
jProgressBar1.setValue(i);
jProgressBar1.repaint();
}
public static void main(String args[]) {
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
Controller app = new Controller();
app.setVisible(true);
app.setResizable(false);
}
});
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
ChildModel model = new ChildModel();
Thread t1 = new Thread(model);
t1.start();
}
private javax.swing.JProgressBar jProgressBar1; //Initialized with Netbeans builder
}
我的ChildModel（ChildModel.java）计算了一些代码（大约需要10到20秒），我想显示父类（Controller.java）的进度。
这是我的ChildModel：
public class ChildModel implements Runnable
{
public ChildModel(){ /* Something */ }
public void complexMath()
{
//Lots of logic here
Controller.updateProgression(purcent);
}
@Override
public void run() {
complexMath();
}
}
问题显然是我的静态void updateProgressBar无法修改非静态变量。我怎样才能做到这一点？
最佳答案
jProgressBar1变量是一个实例变量，因此您不能从静态方法访问它。而且该方法不应是静态的：您想更新控制器中的进度，而不是所有Controller实例中的进度。
将对控制器的引用传递给ChildModel，并使用ChildModel中的此引用来更新进度条。还要记住，所有Swing交互都必须在EDT中完成，而不是在后台线程中完成。因此，代码应如下所示：
public class Controller extends javax.swing.JFrame
{
public void updateProgressBar(int i) {
jProgressBar1.setValue(i);
// no need for repaint. The progress bar knows it must be repainted
// when its value changes
}
public static void main(String args[]) {
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
Controller app = new Controller();
app.setVisible(true);
app.setResizable(false);
}
});
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
ChildModel model = new ChildModel(this);
Thread t1 = new Thread(model);
t1.start();
}
private javax.swing.JProgressBar jProgressBar1; //Initialized with Netbeans builder
}
public class ChildModel implements Runnable
{
private Controller controller;
public ChildModel(Controller controller){
this.controller = controller;
}
public void complexMath()
{
//Lots of logic here
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
controller.updateProgression(percent);
}
});
}
@Override
public void run() {
complexMath();
}
}