Differences between comparable and comparator

The same thing

Are used to compare objects

Difference

1、Comparable： stay java.lang It's a bag
Comparator： stay java.util It's a bag

2、Comparable： Need to rewrite compareTo(Object o） Method
Comparator： Need to rewrite compare(Object o1, Object o2) Method

3、comparable：① It's an internal comparator , Objects of this class can be directly compared with each other this.compareTo(this),② You can use it directly Collections.sort Methods the sorting
Comparator：① It's an external comparator , It didn't come true comparable You can also compare and sort compare（o1,o2)

4、omparator It is a typical strategy pattern

5、Comparable and Comparator There is ,Comparator High priority

6、Comparable： You need to modify the original entity class , It's a natural sort
Comparator： A comparator implemented without modifying the original class , Widely used in practice