swing实现双击Shift

java swing 如何实现双击Shift呢?

startTimeField_3.addKeyListener(new KeyListener() {
			private long lastTimeMillSencond;
			@Override
			public void keyTyped(KeyEvent e) {
			}
			
			@Override
			public void keyReleased(KeyEvent e) {
			}
			
			@Override
			public void keyPressed(KeyEvent e) {
				if(e.isShiftDown()){
					if(lastTimeMillSencond==0){
						lastTimeMillSencond=System.currentTimeMillis();
					}else{
						long currentTime=System.currentTimeMillis();
						if(currentTime-lastTimeMillSencond<1000){
							System.out.println("双击Shift");
							lastTimeMillSencond=0;
						}else{
							lastTimeMillSencond=System.currentTimeMillis();
						}
					}
				}
			}
		});

 下面的是错误的:

 

会导致:连续按下Shift 3次,会造成两次双击Shift