Java OCA OCP Practice Question 963

Question

What is the output of the following code? 

import rope.*; //from   ww w. j a  v  a 2s .c  o  m
import static rope.Main.*; 
public class MainSwing { 
  private static Main rope1 = new Main(); 
  private static Main rope2 = new Main(); 
  { 
    System.out.println(rope1.length); 
  } 
  public static void main(String[] args) { 
    rope1.length = 2; 
    rope2.length = 8; 
    System.out.println(rope1.length); 
  } 
} 

package rope; 
public class Main { 
  public static int length = 0; 
}
  • A. 02
  • B. 08
  • C. 2
  • D. 8
  • E. The code does not compile.
  • F. An exception is thrown. 


D.

Note

There are two details to notice in this code.

First, note that MainSwing has an instance initializer and not a static initializer.

Since MainSwing is never constructed, the instance initializer does not run.

The other detail is that length is static.

Changes from one object update this common static variable.




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