import sun.swing.AccumulativeRunnable; //导入依赖的package包/类
private static AccumulativeRunnable<Runnable> getDoSubmit() {
    synchronized (DO_SUBMIT_KEY) {
        final AppContext appContext = AppContext.getAppContext();
        Object doSubmit = appContext.get(DO_SUBMIT_KEY);
        if (doSubmit == null) {
            doSubmit = new DoSubmitAccumulativeRunnable();
            appContext.put(DO_SUBMIT_KEY, doSubmit);
        }
        @SuppressWarnings("unchecked")
        AccumulativeRunnable<Runnable> tmp = (AccumulativeRunnable<Runnable>) doSubmit;
        return tmp;
    }
}
 

import sun.swing.AccumulativeRunnable; //导入依赖的package包/类
/**
 * Sets the {@code progress} bound property.
 * The value should be from 0 to 100.
 *
 * <p>
 * Because {@code PropertyChangeListener}s are notified asynchronously on
 * the <i>Event Dispatch Thread</i> multiple invocations to the
 * {@code setProgress} method might occur before any
 * {@code PropertyChangeListeners} are invoked. For performance purposes
 * all these invocations are coalesced into one invocation with the last
 * invocation argument only.
 *
 * <p>
 * For example, the following invokations:
 *
 * <pre>
 * setProgress(1);
 * setProgress(2);
 * setProgress(3);
 * </pre>
 *
 * might result in a single {@code PropertyChangeListener} notification with
 * the value {@code 3}.
 *
 * @param progress the progress value to set
 * @throws IllegalArgumentException is value not from 0 to 100
 */
protected final void setProgress(int progress) {
    if (progress < 0 || progress > 100) {
        throw new IllegalArgumentException("the value should be from 0 to 100");
    }
    if (this.progress == progress) {
        return;
    }
    int oldProgress = this.progress;
    this.progress = progress;
    if (! getPropertyChangeSupport().hasListeners("progress")) {
        return;
    }
    synchronized (this) {
        if (doNotifyProgressChange == null) {
            doNotifyProgressChange =
                new AccumulativeRunnable<Integer>() {
                    @Override
                    public void run(List<Integer> args) {
                        firePropertyChange("progress",
                           args.get(0),
                           args.get(args.size() - 1));
                    }
                    @Override
                    protected void submit() {
                        doSubmit.add(this);
                    }
                };
        }
    }
    doNotifyProgressChange.add(oldProgress, progress);
}
 

import sun.swing.AccumulativeRunnable; //导入依赖的package包/类
private static AccumulativeRunnable<Runnable> getDoSubmit() {
    synchronized (DO_SUBMIT_KEY) {
        final AppContext appContext = AppContext.getAppContext();
        Object doSubmit = appContext.get(DO_SUBMIT_KEY);
        if (doSubmit == null) {
            doSubmit = new DoSubmitAccumulativeRunnable();
            appContext.put(DO_SUBMIT_KEY, doSubmit);
        }
        return (AccumulativeRunnable<Runnable>) doSubmit;
    }
}