1. | Which of the following are the wrapper classes?
(A) Random
(B) Byte
(C) Vector
(D) Integer
(E) Short
(F) Double
(G) String |
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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. | 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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4. | Which of the following methods belong to the String class? |
| | Half-n-half Clue
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5. | The methods wait() and notify() are defined in |
| | Half-n-half Clue
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6. | Given the code
String s1 = "yes";
String s2 = "yes";
String s3 = new String(s1);
Which of the following would equate to true?
(A) s1 == s2
(B) s1 = s2
(C) s3 == s1
(D) s1.equals(s2)
(E) s3.equals(s1) |
| | Half-n-half Clue
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7. | 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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