RAII in Java

public interface Disposable {
  void dispose();
}

public abstract class Using<T extends Disposable> {
  public Using(T obj) {
    try {
      run(obj);
    } finally {
      obj.dispose();
    }
  }

  public abstract void run(T obj);
}

public class Resource implements Disposable {
  public void dispose() {
    // Release resource
  }
}

new Using<Resource>(new Resource()) {
  public void run(Resource obj) {
    // Do something
  }
};

public abstract class Transaction {
  public Transaction(DAO dao) {
    boolean res = false;
    
    dao.beginTransaction();

    try {
      res = run();
    } finally {
      if(res) {
        dao.commit();
      } else {
        dao.rollback();
      }
    }
  }

  public abstract boolean run();
}

final DAO dao = DAOFactory.create(...);

new Transaction(dao) {
  public boolean run() {
    dao.executeUpdate("INSERT INTO hoge VALUES (?, ?)", "3", "foo");
    dao.executeUpdate("INSERT INTO hoge VALUES (?, ?)", "4", "bar");
    return true;
  }
};