Arrays - Absolute Java - page 411

• The indexed variables of an array can be used as an argument to be plugged in for a
parameter of the array's base type.
• A method can have parameters of an array type. When the method is invoked, an
entire array is plugged in for the array parameter.
• A method may return an array as the value returned by the method.
• When using a partially filled array , your program needs an additional variable of type
int to keep track of how much of the array is being used.
• An instance variable of a class can be of an array type.
• If you need an array with more than one index, you can use a multidimensional array,
which is actually an array of arrays.
Answers to Self-Test Exercises
1 . a . word
b . String
c . 5
d. 0 through 4 inclusive
e. Any of the following would be correct:
word[0], word[1], word[2], word[3], word[4]
2 . a . 10
b . 0
c . 9
3 . a, b, c,
4 . 1.1 2.2 3.3
1.1 3.3 3.3
5. The for loop uses indices 1 through sampleArray.length , but the correct indices
are 0 through sampleArray.length - 1 . The last index, sampleArray.length ,
is out of bounds. What was probably intended is the following:
int [] sampleArray = new int [10];
for ( int index = 0; index < sampleArray.length; index++)
sampleArray[index] = 3*index;
6. The last value of index is a.length - 1 , which is the last index of the array.
However, when index has the value a.length - 1 , a[index + 1] has an index
that is out of bounds because index + 1 is one more than the largest array index.
The for loop ending condition should instead be index < a.length - 1.