Java8 Lambda表达式排序实战
所属分类 java8
浏览量 940
public class SortTest {
public static void main(String[] args) throws Exception {
System.out.println("lambda SortTest start " + LocalDateTime.now());
List pets = new ArrayList<>();
pets.add(new Pet("tiger",9));
pets.add(new Pet("tiger",7));
pets.add(new Pet("cat",8));
pets.add(new Pet("cat",3));
pets.add(new Pet("cat",5));
System.out.println(pets);
pets.sort((final Pet pet1, final Pet pet2) -> pet1.name.compareTo(pet2.name));
System.out.println(pets);
pets.sort((Pet pet1,Pet pet2) -> pet1.name.compareTo(pet2.name));
System.out.println(pets);
pets.sort((pet1,pet2) -> pet1.name.compareTo(pet2.name));
System.out.println(pets);
// compareByName must be public !!!
pets.sort(Pet::compareByName);
System.out.println(pets);
pets.sort(Pet::compareByNameDesc);
System.out.println(pets);
pets.sort(Pet::compareByAgeDesc);
System.out.println(pets);
pets.sort(Comparator.comparing(Pet::getName));
System.out.println(pets);
Comparator comp = Pet::compareByAge;
pets.sort(comp);
System.out.println(pets);
pets.sort(comp.reversed());
System.out.println(pets);
// 组合条件
comp = Comparator.comparing(Pet::getName).thenComparing(Pet::getAge);
pets.sort(comp);
System.out.println(pets);
}
}
完整代码
https://gitee.com/dyyx/hellocode/blob/master/src/dyyx/java8/lambda/SortTest.java
https://gitee.com/dyyx/hellocode/blob/master/src/dyyx/java8/lambda/Pet.java
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