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Singleton Design Pattern Java Implementation

public class SingletonClass {

private SingletonClass singletonClass ;

private SingletonClass(){
}

public static SingletonClass getInstance(){
if (null != singletonClass) {
singletonClass = new SingletonClass() ;
}
return singletonClass ;
}
}

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ImmutableList Example

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