Java8 Lambda表达式-Stream API

import lombok.Data;
import org.junit.Test;

import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * @author lilili
 * @version 0.0.1
 */
public class TestStream {

    List<Student> studentList = Arrays.asList(
            new Student("小1", 18, 5000.00),
            new Student("小2", 28, 10000.00),
            new Student("小3", 10, 100000.00),
            new Student("小4", 48, 1000000.00),
            new Student("小5", 58, 10000000.00)
    );

    @Test
    public void testStream1() {

        studentList.stream().filter(s -> s.getAge() > 10).forEach(System.out::println);
        studentList.stream().filter(s -> s.getAge() > 10).limit(1).forEach(System.out::println);
        studentList.forEach(System.out::println);

        System.out.println("----------------获取studentList所有的name生产一个新的的集合-----------------");
        List<String> names =
                studentList.stream()
                        .map(Student::getName)
                        .collect(Collectors.toList());
        names.forEach(System.out::println);

        System.out.println("-------------------获取studentList所有的age并且排序生产一个新的集合-----------------------");
        List<Integer> ages =
                studentList.stream()
                        .map(Student::getAge)
                        .sorted()
                        .collect(Collectors.toList());
        ages.forEach(System.out::println);

        System.out.println("----------------获取studentList 所有age>18的同学名称生产一个新的集合--------------------------");
        List<String> names2 =
                studentList.stream()
                        .filter(student -> student.getAge() > 18)
                        .map(Student::getName)
                        .collect(Collectors.toList());
        names2.forEach(System.out::println);

        System.out.println("----------------转换studentList to map 并且以name当做key--------------------------");
        
        Map<String, Student> settingVoMap =
                studentList
                        .stream()
                        .collect(Collectors.toMap(Student::getName, a -> a, (k1, k2) -> k1));

        System.out.println(settingVoMap);
        System.out.println(settingVoMap.get("小2"));
    }


}

@Data
class Student {

    public String name;

    public int age;

    public Double salary;

    public Student(String name, int age, Double salary) {
        this.name = name;
        this.age = age;
        this.salary = salary;
    }
}