你必须使用线程.设计一个实现Runnable接口的类,它将更新这样的值.
class ProgressBarUpdator implements java.lang.Runnable {
/
* Progress bar that shows the current status
*/
private javax.swing.JProgressBar jpb = null;
/
* Progress bar value
*/
private java.lang.Integer value = null;
/
* Constructor
* @param jpb The progress bar this has to update
*/
public ProgressBarUpdator(javax.swing.JProgressBar jpb) {
this.jpb = jpb;
jpb.setMaximum(100);
}
/
* Sets the value to the progress bar
* @param value Value to set
*/
public void setValue(java.lang.Integer value) {
this.value = value;
}
/
* Action of the thread will be executed here. The value of the progress bar will be set here.
*/
public void run() {
do {
if (value != null) {
jpb.setValue((int)java.lang.Math.round(java.lang.Math.floor(value.intValue() * 100 / maximum)));
}
try {
java.lang.Thread.sleep(100L);
} catch (java.lang.InterruptedException ex) {
ex.printStackTrace();
}
} while (value == null || value.intValue() < jpb.getMaximum());
}
}
并且在你的frame类中使用progressBar和这样的新类
ProgressBarUpdator ju = new ProgressBarUpdator(progressBar);
new java.lang.Thread(ju).start();
每当您想要更改值时,只需使用该语句即可
ju.setValue([Value to set]);
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