(Official Java development engineer QQ group (27163376), please enter your ID for verification. ? A very classic must-read book for JAVA programmers, I suggest you read it. The readers of this book have the most basic coding skills, you are a beginner coder, you can understand how to design a good code; you are an advanced programmer, you can understand design patterns and the side of Java The use of angular technology; you are a cutting-edge systems analyst, from which you can empathize and find solutions to project common problems.
Design Patterns_20091017.pdf)