How to set/get string in Java safely?
Class Foo {
    String aString;
    public String getString() {
        return aString;
    }
    public void setString(s) {
        aString = s;
    }
}

Class Foo {
    String aString;
    ReentrantLock aLock;
    public String getString() {
        aLock.lock();
        return aString;
        aLock.unlock(); // This line will be unreachable. How to fix??
    }
    public void setString(s) {
        aLock.lock();
        aString = s;
        aLock.unlock();
    }
}

public String getString() {
  try {
    aLock.lock();
    return aString;
  } finally {
    aLock.unlock();
  }
}

public void setString(s) {
  try {
    aLock.lock();
    aString = s;
  } finally {
    aLock.unlock();
  }
}

public synchronized String getString() {
        return aString;
    }

    public synchronized void setString(s) {
        aString = s;
    }