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), (C) & (E)   (C), (E) & (F)   (B), (E) & (F)   (A), (B), (C), (E) & (F)   (B), (C), (E) & (F)   Hint Half-n-half Clue   2. Which of the following statements are valid array declaration? (A) int number(); (B) float average[]; (C) double[] marks; (D) counter int[];   (A) & (C)   (B) & (C)   (D)   (A)   Half-n-half Clue   3. What will be the content of array variable table after executing the following code? for(int i = 0; i < 3; i + +) for(int j = 0; j < 3; j + +) if(j = i) table[i][j] = 1; else table[i][j] = 0;   1 0 0 0 1 0 0 0 1   0 0 1 0 1 0 1 0 0   1 0 0 1 1 0 1 1 1   0 0 0 0 0 0 0 0 0   Half-n-half Clue   4. Which of the following contain error? (A) int x[] = int[10]; (B) int[] y = new int[5]; (C) float d[] =   (A), (B), (D), (E) & (F)   (D), (E) & (F)   (A), (E) & (F)   (A), (D) & (F)   (A), (D) & (E)   Half-n-half Clue   5. When we implement the Runnable interface, we must define the method   main()   resume()   run()   init()   start()   Half-n-half Clue   6. 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), (B) & (C)   (C), (D) & (E)   (A), (C) & (E)   (A), (D) & (E)   (D) & (E)   Half-n-half Clue   7. The methods wait() and notify() are defined in   java.lang.String   java.lang.Thread   java.lang.ThreadGroup   java.lang.Runnable   java.lang.Object   Half-n-half Clue