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   (B), (E) & (F)   (C), (E) & (F)   (B), (C) & (E)   (A), (B), (C), (E) & (F)   (B), (C), (E) & (F)   Hint Half-n-half Clue   2. 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)   (C), (D) & (E)   (A), (D) & (E)   (D) & (E)   (A), (C) & (E)   (A), (B) & (C)   Half-n-half Clue   3. Which of the following contain error? (A) int x[] = int[10]; (B) int[] y = new int[5]; (C) float d[] =   (D), (E) & (F)   (A), (D) & (E)   (A), (B), (D), (E) & (F)   (A), (E) & (F)   (A), (D) & (F)   Half-n-half Clue   4. The methods wait() and notify() are defined in   java.lang.Thread   java.lang.Runnable   java.lang.Object   java.lang.String   java.lang.ThreadGroup   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[];   (B) & (C)   (A)   (A) & (C)   (D)   Half-n-half Clue   6. Which of the following methods belong to the String class?   length()   compareTo()   substring()   All of these   equals()   None of these   Half-n-half Clue   7. 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.   (A), (B) & (D)   (C), (D) & (E)   (D) & (E)   (B), (D) & (E)   (A), (B), (D) & (E)   Half-n-half Clue