Comparable interface and comparator interface

comparable Interface and comparator The difference and usage of interface implementation comparison

1. Definition

Comparable Interface ：

Use Array or Collection The sorting method of , Custom classes need to implement Java Provide Comparable Interface compareTo(TOBJ) Method , It is used by the sorting method , This method should be rewritten , If “this” Object is smaller than the object parameters passed 、 Equal or greater , It returns a negative integer 、0 Or a positive integer

Comparator Interface ：

You can compare the specific fields of two objects （ such as , Compare the age of the employee ）, Of this interface compare(Objecto1, Object o2) The implementation of the method needs to pass two object parameters , If the first parameter is less than 、 be equal to 、 Greater than second parameter , Returns a negative integer 、0、 Positive integer

comparable Interface and comparator Interface difference

• Comparable and Comparator Interfaces are used to sort collections or arrays of objects
• Comparable Interfaces are used to provide natural ordering of objects , It can be used to provide sorting based on a single logic
• Comparator Interfaces are used to provide different sort algorithms , You can select the required Comparator To sort the specified set of objects .