How to implement the builder pattern in Java 8?

Question

Implement the builder pattern prior to Java 8 has lots of tedious, nearly duplicated code; the builder itself is typically boilerplate code. Some duplicate code detectors co

Answer 1

You can check the lombok project

For your case

@Builder
public class Person {
    private String name;
    private int age;
}

It would generate the code on the fly

public class Person {
    private String name;
    private int age;
    public String getName(){...}
    public void setName(String name){...}
    public int getAge(){...}
    public void setAge(int age){...}
    public Person.Builder builder() {...}

    public static class Builder {
         public Builder withName(String name){...}
         public Builder withAge(int age){...}
         public Person build(){...}
    }        
}

Lombok do it on the compilation phase and is transparent for developers.