programming languages Online Quiz - 52
| Description: programming languages Online Quiz - 52 | |
| Number of Questions: 20 | |
| Created by: Aliensbrain Bot | |
| Tags: programming languages |
Select three correct statements
How old are you
How old are you 1
How old are you 2
How old are you 3
How old are you 4
How old are you 5
How old are you 6
How old are you 7
Select three correct statements.
Which of the following are methods of the Thread class.
Casting occurs commonly between numeric types
Which are valid declarations? (Choose all that apply)
public class A { private int counter=0; public static int getInstanceCount() { return counter; } public A() { counter++; } } Given this code from Class B: 25. A a1 = new A(); 26. A a2 = new A(); 27. A a3 = new A(); 28. System.out.println(A.getInstanceCount()); What is the result?
class Eggs { int doX(Long x, Long y) { return 1; } int doX(long... x) { return 2; } int doX(Integer x, Integer y) { return 3; } int doX(Number n, Number m) { return 4; } public static void main(String[] args) { new Eggs().go(); } void go() { short s = 7; System.out.print(doX(s,s) + " "); System.out.println(doX(7,7)); } } What is the result?
You read the following statement in a Java program that compiles and executes. submarine.dive(depth); What can you say for sure?
Given: 11.classA { 12. public void process() { System.out.print(”A “); } } 13. class B extends A { 14. public void process() throws RuntimeException { 15. super.process(); 16. if (true) throw new RuntimeException(); 17. System.out.print(“B”); }} 18. public static void main(String[] args) { 19. try { ((A)new B()).process(); } 20. catch (Exception e) { System.out.print(”Exception “); } 21. } What is the result?
- rbo = new ReallyBigObject(); 12. // more code here 13. rbo = null; 14. /* insert code here */ Which statement should be placed at line 14 to suggest that the virtual machine expend effort toward recycling the memory used by the object rbo?
- public class Threads5 { 2. public static void main (String[] args) { 3. new Thread(new Runnable() { 4. public void run() { 5. System.out.print("bar"); 6. }}).start(); 7. } 8. } What is the result?
- import java.util.*; 2. 3. public class LetterASort{ 4. public static void main(String[] args) { 5. ArrayList strings = new ArrayList(); 6. strings.add("aAaA"); 7. strings.add("AaA"); 8. strings.add("aAa"); 9. strings.add("AAaa"); 10. Collections.sort(strings); 11. for (String s : strings) { System.out.print(s + " "); } 12. } 13. } What is the result?