Java8的lambda表达式遍历集合

Java8的lambda表达式遍历集合

这里简单的forEach循环遍历List和Map，为了拥抱未来后续将出一个关于介绍Java8、Java9和Java11的新特性专题栏目。

示例

package com.cnsyear.demo;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class java8Demo {

    public static void main(String[] args) {
        List<Student> list = new ArrayList<Student>() {{
            add(new Student("zhaojie", 18));
            add(new Student("zhaojie1", 19));
            add(new Student("zhaojie2", 20));
        }};

        list.forEach(student -> {
            System.out.println(student.getName() + "\t" + student.getAge());
        });

        Map<String, String> map = new HashMap<String, String>() {{
            put("a", "haha");
            put("b", "hahaha");
            put("d", "hahe");
            put("c", "haheeee");
        }};

        map.forEach((k, v) -> {
            System.out.print("key=" + k);
            System.out.print("\t");
            System.out.println("value=" + v);
        });
    }
}

class Student {
    private String name;
    private int age;

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}


/*
zhaojie	18
zhaojie1	19
zhaojie2	20
key=a	value=haha
key=b	value=hahaha
key=c	value=haheeee
key=d	value=hahe

*/