bug8049533.java 文件源码

public static void main(String[] args) {
    Frame frame = new Frame();
    Panel panel = new Panel();
    frame.add(panel);

    MouseWheelEvent event = new MouseWheelEvent(panel,
            0, 0, 0, 0, 0, 0, 0, 0, false, 0, 0,
            2, // wheelRotation
            PRECISE_WHEEL_ROTATION); // preciseWheelRotation

    MouseWheelEvent convertedEvent = (MouseWheelEvent) SwingUtilities.
            convertMouseEvent(event.getComponent(), event, null);

    if (convertedEvent.getPreciseWheelRotation() != PRECISE_WHEEL_ROTATION) {
        throw new RuntimeException("PreciseWheelRotation field is not copied!");
    }
}