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An array is a variable representing a collection of homogeneous type of elements.
Arrays are useful to represent vector, matrix and other multi-dimensional data. Vector is a one dimensional (1-D) data structure that can be used to store list of items like characters, numbers.
Arrays are useful when same operations are to be performed on various elements of the similar type.
Creating an array is a two step process:
1. Declare an array object
2. Create an array object An array object can be created in two ways:
1. Using new operator and specifying the size
2. Directly initializing the content of array
To declare a 1-D array we use a pair of square brackets [ ] after array name or after data type.
(1) Which of the following refer to the starting index value in arrays ?
(a) 0
(b) 1
(c) null
(d) All of these
(2) What is the size of second dimension in an array sales[5][12] ?
(a) 5
(b) 12
(c) 60
(d) 10
(3) What will expression sales.length return for an array sales[5][12] ?
(a) 5
(b) 12
(c) 60
(d) 120
(4) When an array sales [5][12] is declared without specifying initial values, what is the initial value of sales[0][0] ?
(a) 0
(b) default value
(c) compilation error
(d) 60
(5) What does ‘length’ refer to for an object of String class ?
(a) attribute
(b) method
(c) class variable
(d) class name
(6) If ‘str’ is the object of String class and its content is “Thank GOD”, then what is the value of str.length() ?
(a) 9
(b) 10
(d) 11
(c) 8
(7) What type of value is returned when we use get method of Calendar class with constant DAY_OF_WEEK as an argument ?
(a) int
(b) char
(c) String
(d) boolean