1. | Which of the following classes are available in the java.lang package?
(A) Stack
(B) Object
(C) Math
(D) Random
(E) String
(F) StringBuffer
(G) Vector |
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 Hint
Half-n-half Clue
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2. | 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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3. | Which of the following methods belong to the String class? |
| | Half-n-half Clue
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4. | 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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5. | 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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6. | Consider the following code
int number[] = new int[5]; After execution of this statement, which of the following are true?
(A) number[0] is undefined
(B) number[5] is undefined
(C) number[4] is null
(D) number[2] is 0
(E) number.length() is 5 |
| | 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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