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// Inefficient version

class InefficientDBClient {

public void connect(String user, String pw) {

if (user.equals("") || "".equals(pw))

throw new RuntimeException();

...

}

}

// More efficient version

class EfficientDBClient {

public void connect(String user, String pw) {

if (user.length() == 0 || (pw != null && pw.length() == 0))

throw new RuntimeException();

...

}

}