Free Online 5 Minute Java Test

Question: A programmer is using the following class for wrapping objects and passing it around to multiple threads. Which of the given statements regarding this class are correct?

public class DataObjectWrapper

{

   private final Object obj;

   public DataObjectWrapper(Object pObj){ obj = pObj; }

   public Object getObject() { return obj; }

}

Select 1 option(s)

Question: Which of the following command line options can be used to find out all the dependencies of a module while execution?

Note: Although identifying module dependency is not explicitly mentioned in the exam objectives, we have seen questions on the exam that require you to know about this.

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Question: Given:

public class TestClass

{

  public static void main(String[] args) throws IOException {

       final Reader reader = new FileReader("aaa.a");  //1

       try(reader){

         reader.read(); //2

      }finally{

         reader.read(); //3

      }

      reader.read(); //4

   }

}

Assuming that the fle named aaa.a does not exist, what will be the outcome?

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Question: Which of the following are benefits of polymorphism?

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Question: Which statements regarding the following code are correct?

class Outer

{

   private void Outer() { }

   protected class Inner

   {

   }

}

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Question: Which of the following statements are correct regarding synchronization and locks?

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