1. | Which of the following statements are true?
(A) A Java monitor must either extend Thread or implement Runnable.
(B) The sleep() method should be enclosed in try ... catch block.
(C) The yield() method should be enclosed in try ... catch block.
(D) A thread can be temporarily suspended from running by using the wait() method.
(E) A suspended thread using suspend() method can be revived using the resume() method. |
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 Hint
Half-n-half Clue
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2. | Which of the following contain error?
(A) int x[] = int[10];
(B) int[] y = new int[5];
(C) float d[] = |
| | Half-n-half Clue
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3. | Suppose that s1 and s2 are two strings. Which of the statements or expressions are valid?
(A) String s3 = s1 + s2;
(B) String s3 = s1 - s2;
(C) s1 <= s2
(D) s1.compareTo(s2);
(E) int m = s1.length(); |
| | Half-n-half Clue
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4. | Given the following code:
class Base { int x = 10; }
class Derived extends Base
{ int x = 20; }
Base b = new Base();
Derived d = new Derived ( );
Base bd = new Derived();
The statement
System.out.println(b.x + " " + d.x + " " + bd.x);
will produce the output |
| | Half-n-half Clue
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5. | Given the code
String s = new String("abc");
Which of the following calls are valid?
(A) s.trim()
(B) s.replace('a', 'A')
(C) s.substring(3)
(D) s.toUppercase()
(E) s.setCharAt(1,'A')
(F) s.append("xyz") |
| | Half-n-half Clue
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6. | When we implement the Runnable interface, we must define the method |
| | Half-n-half Clue
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7. | The methods wait() and notify() are defined in |
| | Half-n-half Clue
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