Person builder

gistfile1.txt

class Person {

// final fields can be public, no more getter bullshit
public final String name;
public final String sex;
public final int age;

...

// private constructor to be used by Builder only, constructor inject everything in one go and never modify.
private Person(String name, int age, String sex) {
  this.name=name;
  this.age=age;
  this.sex=sex;
}

public static Person.Builder person() {
  return new Builder();
}

// public static convenience method that gives you a builder with the name already set
public static Person.Builder person(String name) {
  return new Builder().name(name).
}

// another convenience method
public static Person.Builder person(String name, int age, String sex) {
  return new Builder().name(name).age(age).sex(sex);
}

public static class Builder() {
  String name, sex;
  int age;

  ....

  // returns a properly immutable & 100% threadsafe Person object
  public Person build() {
    // construct the thing
    return new Person(name,age,sex);
  }

}