Java Collection

1. Introduction

The Java collection can be roughly divided into four systems: Set, List, Queue and Map

• Set: unordered and unrepeatable; 无序，不可重复
• List: ordered and repetable sets; 有序，可重复
• Map: collections with mapping relations; 两个具有映射关系的集合
• Queue: First in first out list(Java 5) FIFO队列