10.5

Arrays: A Simple Example

ARRAYS

10.5   Arrays: A Simple Example

The example:

class Gauss {

public static void main(String[] args) {

int[] ia = new int[101];

for (int i = 0; i < ia.length; i++)

ia[i] = i;

int sum = 0;

for (int i = 0; i < ia.length; i++)

sum += ia[i];

System.out.println(sum);

}

}

that produces output:

5050

declares a variable

ia

 that has type array of

int

, that is,

int[]

. The variable

ia

 is

initialized to reference a newly created array object, created by an array creation

expression ( 15.9). The array creation expression specifies that the array should

have

101

 components. The length of the array is available using the field

length

,

as shown.

The example program fills the array with the integers from

0

 to

100

, sums

these integers, and prints the result.

10.6   Arrays Initializers

An

array initializer

 may be specified in a declaration, creating an array and pro 

viding some initial values:

ArrayInitializer:

{

VariableInitializers

opt

 ,

opt

 }

VariableInitializers:

VariableInitializer

VariableInitializers

 ,

VariableInitializer

The following is repeated from  8.3 to make the presentation here clearer:

VariableInitializer:

Expression

ArrayInitializer

196