当在
Java 8 lambda表达式中使用filter(Predicate<？super T>谓词)调用时,我有两个想法是关于是否将所有Predicate逻辑放在一个调用中,还是链式过滤器(Predicate<？super T>谓词)在适当情况下呼吁提供可读性.
我认为链接过滤器(Predicate<？super T>谓词)调用会很便宜,因为它们还没有遇到终结符,所以在可读性方面会犯错,但我对Streams API的知识不够自信完全明白什么是权衡取舍.
借助以下示例(考虑更复杂的谓词),哪种实现更优越：List< Person> usingOneFilter或List< Person> usingTwoFilters？
import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
public class SEExample {
private static class Person {
private final int age;
private final int heightInCm;
public Person(int age,int heightInCm) {
this.age = age;
this.heightInCm = heightInCm;
}
public int getAge() {
return age;
}
public int getHeight() {
return heightInCm;
}
}
public static void main(String[] args) {
List<Person> people = Arrays.asList(
new Person(14,140),new Person(15,new Person(16,150),new Person(17,120));
List<Person> usingOneFilter = people
.stream()
.filter(p -> p.getAge() >= 16 && p.getHeight() >= 130)
.collect(Collectors.toList());
List<Person> usingTwoFilters = people
.stream()
.filter(p -> p.getAge() >= 16)
.filter(p -> p.getHeight() >= 130)
.collect(Collectors.toList());
}
}
