ReturnAndFinally.java

abstract class ReturnAndFinally {

  private Object foo(Object a) {
    try {
      Object b = bar(a);
      if (b != null) {
        return b;
      }
    } finally {
      System.out.println("foo");
    }
    return null;
  }

  private Object qix(Object a) {
    try {
      Object b = bar(a);
      if (b != null) {
        // 'a' has no constraint, 'b' is null
        return a;
      }
    } finally {
      if (a != null) {
        // 'a' is not null, 'b' is null
        throw new RuntimeException();
      }
    }
    // 'a' is null, 'b' is null
    return null;
  }

  public abstract Object bar(Object o) throws RuntimeException;
}