Java OCA OCP Practice Question 1292

Question

What is the output of the following application? 

package race; /*w w  w.ja  v a2s.co  m*/
abstract class Car {
   static {
      System.out.print("1");
   }

   public Car(String name) {
      super();
      System.out.print("2");
   }

   {
      System.out.print("3");
   }
}

public class Main extends Car {
   {
      System.out.print("4");
   }

   public Main() {
      super("blue");
      System.out.print("5");
   }

   public static void main(String[] gears) {
      new Main();
   }
}
  • A. 23451
  • B. 12354
  • C. 13245
  • D. The code does not compile. 


C.

Note

The class is loaded first, with the static initialization block called and 1 is outputted first.

When the Main is created in the main() method, the superclass initialization happens first.

The instance initialization blocks are executed before the constructor, so 32 is outputted next.

The class is loaded with the instance initialization blocks again being called before the constructor, outputting 45.

The result is that 13245 is printed, making Option C the correct answer.




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