Java quiz 10: Calling constructor from constructor

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In this program we call a constructor within another constructor. Remember what happens when you create an object of a class that extends another class.

Java quiz 10: Calling constructor from constructor

Level: Normal

Note: The classes MySuper and MyClass are two separate files in one package.

What is written to the standard output as the result of executing the following code?

public class MySuper
  MySuper(int x)

public class MyClass extends MySuper
  MyClass(String str)
  public static void main(String[] args)
    MyClass mc = new MyClass();
                                       Author: Sar Maroof

Select the correct answer.

Answer explanation

  1. By creating the object mc, the no-argument constructor of its superclass is called.
  2. The no-argument constructor of the superclass invokes its one-argument constructor by using the statement this(2);.
  3. By passing the value 2 to the one-argument constructor, the value 2 is printed to the standard output.
  4. The statement System.out.print(“s”); prints the letter s to the standard output.
  5. The constructor of MyClass calls its one-argument constructor using the statement this(“t”);
  6. The one-argument constructor of MyClass writes the parameter t to the standard output.
  7. At last the statement System.out.print(“y”); writes y to the standard output.
    So, this program writes 2sty to the standard output.

The correct answer is: e.


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Sar Maroof is graduated from HBO Amsterdam "higher professional education". He is a professional computer programming teacher, gives master classes and publishes technical articles. His experience with developing software started from 2001 and he has worked as a software developer for several big as well as small companies and later as a freelancer. He is the author of Java quizmaster and Build a Java application in 7 days.

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