Look for qualified this usages in the same class.

Examples:

    /**
     * @author caikang
     * @date 2017/04/07
     */
    public class CountDownExample {
        public void operate(CountDownLatch countDownLatch){
            try{
                System.out.println("business logic");
            }catch (RuntimeException e){
                // do something
            }finally {
                countDownLatch.countDown();
            }
        }
    }