JDK1. 8 new feature lambda expression simplification. There is an optimization method of for loop in if else

In the daily development process, being able to write the code does not necessarily mean being able to write the code well. I'm not sure. In the eyes of others, the code written is actually a mess. Therefore, code simplification is particularly important. I once encountered such a type of code, that is, if else has the same for loop. At this time, I thought, How to simplify it can not only improve code performance but also reduce the amount of code.

After some research, it is found that jdk1 8. There is a new lambda feature. In fact, it is very useful. If you are familiar with it, you can reduce a lot of code and improve the performance of the code. For example, I simplified the above code through lambda expression. In this way, does it look less redundant