Встретил http://www.oracle.com/webfolder/technetwork/tutorials/obe/java/Lambda-QuickStart/index.html#section4 пример инициализации полей класса при помощи внутреннего статического класса:| Код |
package com.example.lambda;
import java.util.ArrayList;
import java.util.List;
import java.util.function.Function;
/**
* @author MikeW
*/
public class Person {
private String givenName;
private String surName;
private int age;
private Gender gender;
private String eMail;
private String phone;
private String address;
public static class Builder{
private String givenName="";
private String surName="";
private int age = 0;
private Gender gender = Gender.FEMALE;
private String eMail = "";
private String phone = "";
private String address = "";
public Person.Builder givenName(String givenName){
this.givenName = givenName;
return this;
}
public Person.Builder surName(String surName){
this.surName = surName;
return this;
}
public Person.Builder age (int val){
age = val;
return this;
}
public Person.Builder gender(Gender val){
gender = val;
return this;
}
public Person.Builder email(String val){
eMail = val;
return this;
}
public Person.Builder phoneNumber(String val){
phone = val;
return this;
}
public Person.Builder address(String val){
address = val;
return this;
}
public Person build(){
return new Person(this);
}
}
private Person(){
super();
}
private Person(Person.Builder builder){
givenName = builder.givenName;
surName = builder.surName;
age = builder.age;
gender = builder.gender;
eMail = builder.eMail;
phone = builder.phone;
address = builder.address;
}
public String getGivenName(){
return givenName;
}
public String getSurName(){
return surName;
}
public int getAge(){
return age;
}
public Gender getGender(){
return gender;
}
public String getEmail(){
return eMail;
}
public String getPhone(){
return phone;
}
public String getAddress(){
return address;
}
public void print(){
System.out.println(
"\nName: " + givenName + " " + surName + "\n" +
"Age: " + age + "\n" +
"Gender: " + gender + "\n" +
"eMail: " + eMail + "\n" +
"Phone: " + phone + "\n" +
"Address: " + address + "\n"
);
}
public String printCustom(Function <Person, String> f){
return f.apply(this);
}
public void printWesternName(){
System.out.println("\nName: " + this.getGivenName() + " " + this.getSurName() + "\n" +
"Age: " + this.getAge() + " " + "Gender: " + this.getGender() + "\n" +
"EMail: " + this.getEmail() + "\n" +
"Phone: " + this.getPhone() + "\n" +
"Address: " + this.getAddress());
}
public void printEasternName(){
System.out.println("\nName: " + this.getSurName() + " " + this.getGivenName() + "\n" +
"Age: " + this.getAge() + " " + "Gender: " + this.getGender() + "\n" +
"EMail: " + this.getEmail() + "\n" +
"Phone: " + this.getPhone() + "\n" +
"Address: " + this.getAddress());
}
@Override
public String toString(){
return "Name: " + givenName + " " + surName + "\n" + "Age: " + age + " Gender: " + gender + "\n" + "eMail: " + eMail + "\n";
}
public static List<Person> createShortList(){
List<Person> people = new ArrayList<>();
people.add(
new Person.Builder()
.givenName("Bob")
.surName("Baker")
.age(21)
.gender(Gender.MALE)
.email("bob.baker@example.com")
.phoneNumber("201-121-4678")
.address("44 4th St, Smallville, KS 12333")
.build()
);
people.add(
new Person.Builder()
.givenName("Jane")
.surName("Doe")
.age(25)
.gender(Gender.FEMALE)
.email("jane.doe@example.com")
.phoneNumber("202-123-4678")
.address("33 3rd St, Smallville, KS 12333")
.build()
);
people.add(
new Person.Builder()
.givenName("John")
.surName("Doe")
.age(25)
.gender(Gender.MALE)
.email("john.doe@example.com")
.phoneNumber("202-123-4678")
.address("33 3rd St, Smallville, KS 12333")
.build()
);
people.add(
new Person.Builder()
.givenName("James")
.surName("Johnson")
.age(45)
.gender(Gender.MALE)
.email("james.johnson@example.com")
.phoneNumber("333-456-1233")
.address("201 2nd St, New York, NY 12111")
.build()
);
people.add(
new Person.Builder()
.givenName("Joe")
.surName("Bailey")
.age(67)
.gender(Gender.MALE)
.email("joebob.bailey@example.com")
.phoneNumber("112-111-1111")
.address("111 1st St, Town, CA 11111")
.build()
);
people.add(
new Person.Builder()
.givenName("Phil")
.surName("Smith")
.age(55)
.gender(Gender.MALE)
.email("phil.smith@examp;e.com")
.phoneNumber("222-33-1234")
.address("22 2nd St, New Park, CO 222333")
.build()
);
people.add(
new Person.Builder()
.givenName("Betty")
.surName("Jones")
.age(85)
.gender(Gender.FEMALE)
.email("betty.jones@example.com")
.phoneNumber("211-33-1234")
.address("22 4th St, New Park, CO 222333")
.build()
);
return people;
}
}
|
Раньше не встречал. Может, кто знает, как называется этот паттерн? |
)
