java8 Optional正确使用姿势-白红宇

import lombok.Data;import lombok.EqualsAndHashCode;import lombok.ToString;import org.apache.commons.lang3.StringUtils;import java.util.Optional;@Data@EqualsAndHashCode(exclude={"self"})@ToString(callSuper=true, exclude="self")public class PersonDto {    private Integer id;    private String name;    private String password;    private Double self;    public boolean validateName1() {        return StringUtils.equals("hjz", name);    }    public static boolean validateName2(String name) {        return StringUtils.equals("hjz", name);    }    public static void main(String[] args) {        PersonDto personDto = new PersonDto();        personDto.setName("hjz");//        String name = Optional.ofNullable(personDto)//                .map(obj -> obj.getName())//                .filter(StringUtils::isNotEmpty)//                .orElseThrow(()->new IllegalArgumentException("The value of param personDto isn't available."));//        String name = Optional.ofNullable(personDto)//                .map(obj -> obj.getName())//                .filter(PersonDto::validateName2)//                .orElseThrow(()->new IllegalArgumentException("The value of param personDto isn't available."));        String name = Optional.ofNullable(personDto)                              .filter(PersonDto::validateName1)                              .map(obj -> obj.getName())                              .orElseThrow(()->new IllegalArgumentException("The value of param personDto isn't available."));        System.out.println(name);    }}

本文转自小眼儿博客园博客，原文链接：http://www.cnblogs.com/hujunzheng/p/7299572.html，如需转载请自行联系原作者