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Thread safe Singleton Design Pattern Java Implementation

public class SingletonClass{
private static SingletonClass instance = null;
private SingletonClass() { }
public static synchronized SingletonClass getInstance() {
if (instance == null) {
instance = new SingletonClass();
}
return instance;
}
}

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ImmutableList Example

private ImmutableList<String> getServerProps(){       ImmutableList.Builder<String> serverProps = ImmutableList.builder();      ...