Java Language
- Getting started with Java Language
- Top 10 Java Errors with Solutions
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- Comparable and Comparator
-
Sorting a List using Comparable
or a Comparator - Creating a Comparator using comparing method
- Natural (comparable) vs explicit (comparator) sorting
- Sorting Map entries
- The compareTo and compare Methods
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Java Language Comparable and Comparator Creating a Comparator using comparing method
Example
Comparator.comparing(Person::getName)
This creates a comparator for the class Person that uses this person name as the comparison source.
Also it is possible to use method version to compare long, int and double. For example:
Comparator.comparingInt(Person::getAge)
Reversed order
To create a comparator that imposes the reverse ordering use reversed() method:
Comparator.comparing(Person::getName).reversed()
Chain of comparators
Comparator.comparing(Person::getLastName).thenComparing(Person::getFirstName)
This will create a comparator that firs compares with last name then compares with first name. You can chain as many comparators as you want.
