Better java

DataHolder.java

public class DataHolder {
    public final String data;

    public DataHolder(String data) {
        this.data = data;
    }
}

Mail.java

public class TrainWreckPattern {
  public static void main(String[] args) {
    new Mailer()
    .to("[email protected]")
    .from("[email protected]")
    .subject("Some subject")
    .body("Some content")
    .send();

  }
}

class Mailer{
  public Mailer to(String address){ 
    System.out.println("To: "+address); 
    return this;
  }
  public Mailer from(String address){ 
    System.out.println("From: "+address); 
    return this;
  }
  public Mailer subject(String sub){ 
    System.out.println("Subject: "+sub); 
    return this;
  }
  public Mailer body(String body){ 
    System.out.println("Body: "+body); 
    return this;
  }
  public void send(){ 
    System.out.println("Sending ..."); 
  }
}