E. Implement java.lang.Thread and implement the start method. Answer: A, D
Question No 57 Given:
1. public class SyncTest ( 2. private int x; 3. private int y;
4. private synchronized void setX (int i) (x=1;) 5. private synchronized void setY (int i) (y=1;) 6. public void setXY(int 1)(set X(i); setY(i);)
7. public synchronized Boolean check() (return x !=y;) 8. )
Under which conditions will check () return true when called from a different class? A. Check() can never return true.
B. Check() can return true when setXY is called by multiple threads.
C. Check() can return true when multiple threads call setX and setY separately.
D. Check() can only return true if SyncTest is changed to allow x and y to be set separately. Answer: B
Question No 58 Exhibit:
1. class A implements runable ( 2. int i;
3. public void run () ( 4. try (
5. thread.sleep(5000); 6. i= 10;
7. ) catch(InterruptedException e) {} 8. ) 9. ) 10.
11. public class Test {
12. public static void main (string args[]) ( 13. try (
14. A a = new A ();
15. Thread t = new Thread (a); 16. t.start(); 17.
18. int j= a.i; 19.
20. ) catch (Exception e) {} 21. ) 22. )
Which statement al line 17 will ensure that j=10 at line 19?
A. a.wait(); B. t.wait(); C. t.join(); D. t.yield(); E. t.notify(); F. a.notify(); G. t.interrupt(); Answer: C
Question No 59 Exhibit:
1. public class X implements Runnable ( 2. private int x; 3. private int y; 4.
5. public static void main(String [] args) ( 6. X that = new X();
7. (new Thread(that)) . start( ); 8. (new Thread(that)) . start( ); 9. ) 10.
11. public synchronized void run( ) ( 12. for (;;) ( 13. x++; 14. y++;
15. System.out.printIn(“x = “ + x + “, y = “ + y); 16. ) 17. ) 18. )
What is the result?
A. An error at line 11 causes compilation to fail. B. Errors at lines 7 and 8 cause compilation to fail.
C. The program prints pairs of values for x and y that might not always be the same on the same line
(for example, “x=2, y=1”)
D. The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=1, y=1”)
E. The program prints pairs of values for x and y that are always the same on the same line (for example, “x=1, y=1”. In addition, each value appears twice (for example, “x=1, y=1” followed by “x=2s, y=2”) Answer: E
QUESTION NO: 60
Which two CANNOT directly cause a thread to stop executing? (Choose Two) A. Existing from a synchronized block.
B. Calling the wait method on an object. C. Calling notify method on an object.
D. Calling read method on an InputStream object. E. Calling the SetPriority method on a Thread object. Answer: A, C
QUESTION NO: 61 Exhibit
1. public class SyncTest{
2. public static void main(String[] args) { 3. final StringBuffer s1= new StringBuffer(); 4. final StringBuffer s2= new StringBuffer(); 5. new Thread () { 6. public void run() { 7. synchronized(s1) { 8. s2.append(“A”); 9. synchronized(s2) { 10. s2.append(“B”); 11. System.out.print(s1); 12. System.out.print(s2); 13. } 14. } 15. }
16. }.start();
17. new Thread() { 18. public void run() { 19. synchronized(s2) { 20. s2.append(“C”); 21. synchronized(s1) { 22. s1.append(“D”); 23. System.out.print(s2); 24. System.out.print(s1); 25. } 26. } 27. }
28. }.start(); 29. } 30. }
Which two statements are true? (Choose Two) A. The program prints “ABBCAD” B. The program prints “CDDACB” C. The program prints “ADCBADBC”
D. The output is a non-deterministic point because of a possible deadlock condition.
E. The output is dependent on the threading model of the system the program is running on. Answer: D, B
QUESTION NO: 62
Which method in the Thread class is used to create and launch a new thread of execution? A. Run(); B. Start(); B. Execute();
C. Run(Runnable r); D. Start(Runnable r); E. Execute(Thread t); Answer: B -
QUESTION NO: 63 Given:
5. String foo = “base”; 6. foo.substring(0,3); 7. foo.concat(“ket”) 8.
Type the value of foo at line 8. Answer: BASE
QUESTION NO: 64
Which code determines the int value foo closest to, but not greater than, a double value bar? A. Int foo = (int) Math.max(bar); B. Int foo = (int) Math.min(bar); C. Int foo = (int) Math.abs(bar); D. Int foo = (int) Math.ceil(bar); E. Int foo = (int) Math.floor(bar); F. Int foo = (int) Math.round(bar); Answer: E
QUESTION NO: 65 Which statement is true?
A. A flow layout can be used to position a component that should resize horizontally when the container is resized.
B. A grid layout can be used to position a component tat should maintain a constant size even when
the container is resized.
C. A border layout can be used to position component that should maintain a constant size even when
the container is resized.
D. The grid bag layout can be used to give a grid-like layout which differs from the normal grid in that individual rows and columns can have unique sizes.
E. If two components are placed in the same column of a grid bag layout, and one component resizes
horizontally, then the other component must resize horizontally. Answer: D
QUESTION NO: 66
Given an ActionEvent, which method allows you to identify the affected Component? A. Public class getClass() B. Public Object getSource() C. Public Component getSource() D. Public Component getTarget()
E. Public Component getComponent()
F. Public Component getTargetComponent() Answer: B
QUESTION NO: 67 Exhibit:
1. import java.awt.*; 2.
3. public class Test extends Frame { 4. public Test() {
5. add(new Label(“Hello”) ); 6. add(new TextField(“Hello”) ); 7. add(new Button(“Hello”) ); 8. pack(); 9. show(); 10. } 11.
12. public static void main(String args[]) { 13. new Test (); 14. } 15. )
What is the result?
A. The code will not compile.
B. A Window will appear containing only a Button. C. An IllegalArgumentException is thrown at line 6.
D. A Window button will appear but will not contain the Label, TextField, or Button.
E. A Window will appear containing a Label at the top, a TextField below the Label, and a Button below the TextField.
F. A Window will appear containing a Label on the left, a TextField to the right of the Label, and a button to the right of the TextField. Answer: B
QUESTION NO: 68 Exhibit: 1. class A {
2. public int getNumber(int a) { 3. return a + 1; 4. } 5. } 6.
7. class B extends A {