java8 Optional正确使用姿势

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);
}
}