Java8Stream使用

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

public class Test {
    public static void main(String[] args) {

        List list = Arrays.asList("a,b,c", "1,2,3");

        //将每个元素转成一个新的且不带逗号的元素
        Stream s11 = list.stream().map(s -> s.replaceAll(",", ""));
        s11.forEach(System.out::println); // abc 123


        Student s1 = new Student("aa", 10,1);
        Student s2 = new Student("bb", 20,2);
        Student s3 = new Student("cc", 10,3);
        List lists = Arrays.asList(s1, s2, s3);

        //装成list
        List ageList = lists.stream().map(Student::getAge).collect(Collectors.toList()); // [10, 20, 10]
        ageList.forEach(System.out::println); // 10 20 30

    }
}


import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@AllArgsConstructor
@Data
@NoArgsConstructor
public class Student {
    private String name;
    private int age;
    private int id;


}