Tag: programming languages

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Questions Related to programming languages

Multiple choice technology programming languages

Given: 1. package sun.scjp; 2. public enum Color { RED, GREEN, BLUE } 1. package sun.beta; 2. // insert code here 3. public class Beta { 4. Color g = GREEN; 5. public static void main( String[] argv) 6. { System.out.println( GREEN); } 7. } The class Beta and the enum Color are in different packages. Which two code fragments, inserted individually at line 2 of the Beta declaration, will allow this code to compile? (Choose two.)

  1. import sun.scjp.Color.*;

  2. import static sun.scjp.Color.*;

  3. import sun.scjp.Color; import static sun.scjp.Color.*;

  4. import sun.scjp.; import static sun.scjp.Color.;

  5. import sun.scjp.Color; import static sun.scjp.Color.GREEN;
Reveal answer Fill a bubble to check yourself
C,E Correct answer
Full explanation
Multiple choice technology programming languages

Given: 11. public static void parse(String str) { 12. try { 13. float f= Float.parseFloat(str); 14. } catch (NumberFormatException nfe) { 15. f= 0; 16. } finally { 17. System.out.println(f); 18. } 19. } 20. public static void main(String[] args) { 21. parse(”invalid”); 22. } What is the result?

  1. 0.0

  2. Compilation fails

  3. A ParseException is thrown by the parse method at runtime.

  4. A NumberFormatException is thrown by the parse method at
Reveal answer Fill a bubble to check yourself
B Correct answer
Full explanation
Multiple choice technology programming languages

Given: 11. public static void main(String[] args) { 12. Object obj =new int[] { 1,2,3 }; 13. int[] someArray = (int[])obj; 14. for (int i: someArray) System.out.print(i +“ “) 15. } ‘What is the result?

  1. 1 2 3

  2. B. Compilation fails because of an error in line 12.

  3. B. Compilation fails because of an error in line 13.

  4. B. Compilation fails because of an error in line 14.
Reveal answer Fill a bubble to check yourself
A Correct answer
Full explanation
Multiple choice technology programming languages

Given: 10. public class Foo implements java.io.Serializable { 11. private int x; 12. public int getX() { return x; } 12.publicFoo(int x){this.x=x; } 13. private void writeObject( ObjectOutputStream s) 14. throws IOException { 15. // insert code here 16. } 17. } Which code fragment, inserted at line 15, will allow Foo objects to be correctly serialized and deserialized?

  1. s.writeInt(x);

  2. s.serialize(x);

  3. s.writeObject(x);

  4. s.defaultWriteObject();
Reveal answer Fill a bubble to check yourself
D Correct answer
Full explanation