Which of the following are valid declarations? Which instantiate an array object? Explain your answers.
a. int primes = {2, 3, 4, 5, 7, 11};
b. float elapsedTimes[] = {11.47, 12.04, 11.72, 13.88};
c. int[] scores = int[30];
d. int[] primes = new {2,3,5,7,11};
e. int[] scores = new int[30];
f. char grades[] = {'a', 'b', 'c', 'd', 'f'};
g. char[] grades = new char[];
a. Invalid; an int cannot be declared and initialized using an intializer list. The brackets are missing.
b. Valid; the brackets can be placed either after the element type or after the reference variable. However, this is not the preferred technique. This declaration creates an array object.
c. Invalid; the right hand side of the assignment operator must contain either an initializer list or a new operation.
d. Invalid; “new” on the right hand side of the assignment operator is neither necessary nor acceptable.
e. Valid; the assignment is correct Java syntax. This declaration creates an array object.
f. Valid; the brackets can be placed either after the element type or after the reference variab=le. However, this is not the preferred technique. This declaration creates an array object.
g. Invalid; the size of the array must be indicated when the array is instantiated.
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