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package java8.lambda;
import java8.domain.Developer;
import java.util.Comparator;
import java.util.List;
/**
* @Author : yion
* @Date : 2016. 8. 19.
* @Description : https://www.mkyong.com/java8/java-8-lambda-comparator-example/ 람다식 비교구문 및 정렬 처리 예제
* ClassicComparator.java lambda 변환
*/
public class LambdaComparator {
public static void main(String[] args) {
List<Developer> listDevs = Developer.getDevelopers();
System.out.println("Before Sort");
for (Developer developer : listDevs) {
System.out.println(developer);
}
System.out.println("After Sort");
/*
// List.sort() since Java 8
listDevs.sort(new Comparator<Developer>() {
@Override
public int compare(Developer o1, Developer o2) {
return o2.getAge() - o1.getAge();
}
});
*/
// lambda
//listDevs.sort((Developer o1, Developer o2) -> o1.getAge() - o2.getAge());
listDevs.sort((o1, o2) -> o1.getAge() - o2.getAge());
// java 8 only, lambda also, to print the List
listDevs.forEach((developer)-> System.out.println(developer));
/*
//sort by name
Collections.sort(listDevs, new Comparator<Developer>() {
@Override
public int compare(Developer o1, Developer o2) {
return o1.getName().compareTo(o2.getName());
}
});
//lambda
listDevs.sort((Developer o1, Developer o2)->o1.getName().compareTo(o2.getName()));
//lambda
listDevs.sort((o1, o2)->o1.getName().compareTo(o2.getName()));
//sort by salary
Collections.sort(listDevs, new Comparator<Developer>() {
@Override
public int compare(Developer o1, Developer o2) {
return o1.getSalary().compareTo(o2.getSalary());
}
});
*/
System.out.println("sort by salary ");
//lambda
listDevs.sort((Developer o1, Developer o2)->o1.getSalary().compareTo(o2.getSalary()));
//lambda
//listDevs.sort((o1, o2)->o1.getSalary().compareTo(o2.getSalary()));
listDevs.forEach((developer) -> System.out.println(developer));
System.out.println("salary reversed order");
Comparator<Developer> salaryComparator = (o1, o2)->o1.getSalary().compareTo(o2.getSalary());
listDevs.sort(salaryComparator.reversed());
listDevs.forEach((developer) -> System.out.println(developer));
}
}