Item 47: Know and use the libraries

1.  When inputted an Integer.MIN_VALUE, Math.abs will also return Integer.MIN_VALUE.

 

2.  By using a standard library, you take advantage of the knowledge of the experts who wrote it and the experience of those who used it before you.

 

3.  A second advantage of using the libraries is that you don’t have to waste your time writing ad hoc solutions to problems that are only marginally related to your work.

 

4.  A third advantage of using standard libraries is that their performance tends to improve over time, with no effort on your part.

 

5.  A final advantage of using the standard libraries is that you place your code in the mainstream. Such code is more easily readable, maintainable, and reusable by the multitude of developers.