What is AdapterAdapter is a structural design pattern that allows objects with incompatible interface to collaborate. The adapter acts as a wapper to ...

DescriptionGiven an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input wo ...

What is factory patternFactory pattern is a creational pattern. It defines an interface for creating different type of object on the run-time. In this ...

What is PrototypeIt is known as Clone. Prototype is a creational design pattern that enables you copy/clone existing object to create new objects. Exa ...

what is BuilderBuilder is a creational design pattern. It helps you construct complex objects step by step and the final step will return the object. ...

What is Singleton pattern[Wikipedia]: https://en.wikipedia.org/wiki/Singleton_pattern: In software engineering, the singleton pattern is a software de ...

Chapter 1 Introduction这本书是用来帮助你高效的使用Java编程语言以及它的基本类库：java.lang，java.util 和 java.io, 也包括例如java.util.concurrent 和 java.util.function 之类的子包. 其他的类库也将会时不时的 ...