Java8的lambda表达式遍历集合
这里简单的forEach循环遍历List和Map。
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() + " " + 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(" ");
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
*/