java8 Optional正确使用姿势

Java 8 如何正确使用 Optional

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);}
}