1. Which of the following are the wrapper classes? (A) Random (B) Byte (C) Vector (D) Integer (E) Short (F) Double (G) String   (D), (E) & (F)   (B), (D) & (E)   (B), (D), (E) & (F)   (A), (B), (D), (E) & (F)   (B), (D) & (F)   Hint Half-n-half Clue   2. Which of the following contain error? (A) int x[] = int[10]; (B) int[] y = new int[5]; (C) float d[] =   (A), (D) & (E)   (A), (B), (D), (E) & (F)   (A), (D) & (F)   (A), (E) & (F)   (D), (E) & (F)   Half-n-half Clue   3. 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   (B), (C), (E) & (F)   (C), (E) & (F)   (B), (C) & (E)   (A), (B), (C), (E) & (F)   (B), (E) & (F)   Half-n-half Clue   4. 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)   (D) & (E)   (A), (D) & (E)   (A), (C) & (E)   (A), (B) & (C)   (C), (D) & (E)   Half-n-half Clue   5. Which of the following statements are valid array declaration? (A) int number(); (B) float average[]; (C) double[] marks; (D) counter int[];   (A)   (B) & (C)   (A) & (C)   (D)   Half-n-half Clue   6. The methods wait() and notify() are defined in   java.lang.ThreadGroup   java.lang.Thread   java.lang.String   java.lang.Runnable   java.lang.Object   Half-n-half Clue   7. 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();   (A), (D) & (E)   (A), (B) & (C)   (C), (D) & (E)   (A), (C) & (E)   (D) & (E)   Half-n-half Clue