Java基础篇之java8新特性：Optional类

1.前言

1)、Java8 新增Optional类，用于解决空指针

2.例子

import java.util.Optional;

public class Java8Optional {
    public static void main(String[] args) {
        Student student = null;
        String result = Optional.ofNullable(student).map(obj->obj.getAge()).orElse("7");
        System.out.println(result);
    }
}

class Student{
    private String  age;

    public String getAge() {
        return age;
    }

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

一行代码，你品，你细品