Swing手动进行最大化最小化

首先jdk的setExtendedState是有bug的，需要先重载JFrame的setExtendedState方法

    /**
     * Fix the bug "jframe undecorated cover taskbar when maximized". See:
     * http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4737788
     *
     * @param state
     */
    @Override
    public void setExtendedState(int state) {

        if ((state & java.awt.Frame.MAXIMIZED_BOTH) == java.awt.Frame.MAXIMIZED_BOTH) {
            Rectangle bounds = getGraphicsConfiguration().getBounds();
            Rectangle maxBounds = null;
            // Check to see if this is the 'primary' monitor
            // The primary monitor should have screen coordinates of (0,0)
            if (bounds.x == 0 && bounds.y == 0) {
                Insets screenInsets = getToolkit().getScreenInsets(getGraphicsConfiguration());
                maxBounds = new Rectangle(screenInsets.left, screenInsets.top, bounds.width - screenInsets.right - screenInsets.left
                        , bounds.height - screenInsets.bottom - screenInsets.top);
            } else {
                // Not the primary monitor, reset the maximized bounds...
                maxBounds = null;
            }
            super.setMaximizedBounds(maxBounds);
        }
        super.setExtendedState(state);
    }

　　

然后，最大化的时候就设置：

setExtendedState(Frame.MAXIMIZED_BOTH);

但是，最小化的时候，需要注意，设置成：

super.setExtendedState(Frame.ICONIFIED | getExtendedState());

否则，假如直接设置：super.setExtendedState(Frame.ICONIFIED);

还原的时候Sate在~Frame.ICONIFIED之后成了0，就变成了NORMAL态，这样是不对的。