MessageBuilder-selfbound-generics.java

public abstract class MessageBuilder<B extends MessageBuilder<B>>{

 private String name;
 private String id;

 public abstract Message build();

 String getId() {
  return id;
 }

 String getName() {
  return name;
 }

 protected abstract B self();

 public B withId(final String id) {
  this.id = id;
  return self();
 }

 public B withName(final String name) {
  this.name = name;
  return self();
 }

}