OCPJP(SCJP1.6) Question 30

   1: import java.io.File;

   2: import java.io.IOException;

   3:  

   4: /**

   5:  * Created by IntelliJ IDEA.

   6:  * User: Owner

   7:  * Date: 8/6/11

   8:  * Time: 12:57 PM 

   9:  */

  10: public class TestCreateNewFile {

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

  12:         File f = new File("scjp6exam.txt");

  13:         System.out.println(f.exists());

  14:         f.createNewFile();

  15:         System.out.println(f.exists());

  16:     }

  17: }

Options :

A. Prints “ false, false”.

B. Prints “ false, true”

C. Can throw an exception at Line 14.

D. Line 15 may not be executed.

OCPJP(SCJP 1.6) Question 29

   1: public class StringInstanceOfTest {

   2:     public static void main(String[] args) {

   3:         String s = null;

   4:         if(s instanceof String){

   5:             System.out.println("s is instance of String");

   6:         }

   7:         else{

   8:             System.out.println("s is not an instance of String");

   9:         }

  10:     }

  11: }

Output :

A. Compilation fails.

B. Throws Exception at line 4.

C. Prints “s is instance of String”.

D. Prints “s is not an instance of String”.