BHAWANI SIR SET 2

1. Name any two OOP principles.

2. Mention two different styles of expressing a comment in a program.

3. Differentiate between operator and expression.

4. If m=5 and n=2 output the values of m and n after execution in (i) and (ii) :-

i) m -= n;

ii) n = m + m/n

5. What is a compound statement? Give an example.

6. What will be the output of the following if x=5 initially?

i) 5 * ++x

ii) 5 * x++

7. What is the output of the following?

char c = 'A';

short m = 26;

int n = c+m;

System.out.println(n);

8. Define encapsulation.

9. Explain the term object using an example.

10. Define a variable.

11. What is a wrapper class? Give an example.

12. What is the purpose of the new operator?

13. State the two kinds of data types.

14. Write the corresponding expressions for the following mathematical operations :-

i) a2 + b2

ii) z = x3 + y3 –  xy

              ---

                z

15. What is meant by private visibility of a method?

16. What will be the output for the following program segment?

int a=0, b=30, c=40;

a = --b + c++ + b;

System.out.println("a=" + a); 

17. What is a package? Give an example.

18. Name two types of Java programs.

19. Assign the value of pi (3.142) to a variable of requisite data type.

20. Explain the term type casting.

21. Name the following:

i) A package that is invoked by default.

ii) A keyword, to use the classes defined in a package.

22. Name the class that is used for different mathematical functions. Give an example of a mathematical function.

23. State the difference between = and ==.

24. Write an equivalent Java syntax for the following expression:

a = 0.05 - 2y3 / x - y

25. Write a statement for each of the following:

1. Store a number 275 as a String

2. Convert the String to a numeric value

3. Add it to the existing total of 1000 to update the field

26. What is the output of the following?

i) System.out.println ("four :" + 4 + 2);

          ii)System.out.println ("four :" + (2+2));

27. Evaluate the following expressions, if the values of the variables are a = 2, b=3 and c=9

1. a - (b++) * (- -c)

2. a * (++b) % c

28. Mention any two attributes required for class declaration.

29. State the difference between token and identifier.

30. What is inheritance and how is it useful in Java?

31. Explain any two types of access specifier.

32. If a=5, b=9 calculate the value of: a += a++-++b+a

33. Give the output of the following expressions:

i) If x = -9.99, calculate Math.abs(x);

ii) If x = 9.0, calculate Math.sqrt(x);

34. What does the following mean?

Employee stuff = new Employee();

35. Write a Java statement to input / read the following from the user using the keyboard:

i) Character ii) String

36. Why is a class called a factory of objects?

37. State the difference between a boolean literal and a character literal.

38. Write one word answer for the following:

i) A method that converts a string to a primitive integer data type

ii) The default initial value of a boolean variable data type

39. Why is a class known as a composite data type?

40. Write an expression for (a + b)ⁿ

     ----———

      v³ + b

41. Define the term byte code.

42. What do you mean by type conversion? How is implicit conversion different from explicit conversion?

43. What is the result stored in x, after evaluating the following expression?

44. int x = 5;

45. x = x++ * 2 + 3 * --x;

46. Differentiate between private and protected visibility modifiers.

47. What do you understand by the term data abstraction?

48. What will the following functions return when executed?

i) Math.max(-17,-19) ii) Math.ceil(7.8)

i) Why is an object called an instance of a class?

ii) What is the use of the keyword import?

49. What is the difference between an object and a class?

50. What does the ‘token’ keyword refer to, in the context of Java? Give an example for keyword.

51. What is the difference between the / and % operators?

i) Name the package that contains Scanner class

ii) Which unit of the class gets called, when the object of the class is created?

52. What is the role of keyword void in declaring functions?

53. What will be the output of the following code?

i) int k = 5, j = 9;

k+=k++ - ++j + k;

System.out.println("k= " +k);

System.out.println("j= " +j); 

ii) double b = -15.6;

     double a = Math.rint (Math.abs (b));

     System.out.println("a=" +a);

54. Write an expression in Java for z = (5x³ + 2y ) / ( x + y)

55. Give one example each of a primitive data type and a composite data type.

56. Give one point of difference between unary and binary operators.

57. Write a Java expression for v(2as + u²)

58. Name the type of error (syntax, runtime or logical error) in each case given below?

i) Division by a variable that contains a value of zero.

ii) Multiplication operator used when the operation should be division.

iii) Missing semi colon.

59. Complete the code below to create an object of Scanner class.

          Scanner sc = _____ Scanner( _____ );

60. Differentiate between public and private modifiers for members of a class.

61. What will be the result stored in x after evaluating the following expression?

          int x=4;

          x+=(x++) + (++x) + x;

62. Give the output of the following program segment:

          double x = 2.9, y = 2.5;

63. System.out.println(Math.min(Math.floor(x),y));

64. System.out.println(Math.min(Math.ceil(x),y));

65. What is meant by precedence of operators?

66. What is a literal?

67. What are the types of casting shown by the following examples?

i) double x = 15.2;

     int y = (int)x;

ii) int x = 12;

     long y = x;

68. Name any two wrapper classes.

69. Write Java statement to create an object mp4 of class digital.

70. What does a class encapsulate?

71. What is the data type that the following library functions return?

Math.random()

Math.floor()

Math.sqrt()

Math.pow()

72. Write a Java expression for ut + ½ ft²

73. Name the methods of the Scanner class that:

i) Is used to input an integer from standard input stream

ii) Is used to input a string data from standard input stream

74. Which of the following are valid comments?

(i) /* comment */

(ii) /* comment

(iii) // comment

(iv) */ comment */

75. Name the primitive data type in Java that is:

(i) A 64-bit integer and is used when you need a range of values wider than those provided by int.

(ii) A single 16-bit Unicode character whose default value is ‘\u0000'.

76. State one difference between the floating point literals float and double.

77. Operators with higher precedence are evaluated before operators with relatively lower precedence. Arrange the operators given below in order of higher precedence to lower precedence.

(i) &&

(ii) %

(iii) >=

(iv) ++

78. Identify the statements listed below as assignment, increment, method invocation or object creation statements.

(i) System.out.println(“Java”);

(ii) costPrice = 457.50;

(iii) Car hybrid = new Car();

(iv) petrolPrice++;

79. What are the final values stored in variables x and y below? double a = -6.35;

double b = 14.74;

double x = Math.abs(Math.ceil(a));

double y = Math.rint(Math.max(a,b));

80. Give the output of the following method:

public static void main(String[] args)

{ int a = 5;

a++;

System.out.println(a);

a-=(a--) - (--a);

System.out.println(a);

}