ARRAYS

Array Members

10.7

An array initializer is written as a comma separated list of expressions,

enclosed by braces  

{

  and  

}

 .

The length of the constructed array will equal the number of expressions.

Each expression specifies a value for one array component. Each expression

must be assignment compatible ( 5.2) with the array's component type, or a com 

pile time error results.

If the component type is itself an array type, then the expression specifying a

component may itself be an array initializer; that is, array initializers may be

nested.

A trailing comma may appear after the last expression in an array initializer

and is ignored.

As an example:

class Test {

public static void main(String[] args) {

int ia[][] = { {1, 2}, null };

for (int i = 0; i < 2; i++)

for (int j = 0; j < 2; j++)

System.out.println(ia[i][j]);

}

}

prints:

1

2

before causing a

NullPointerException

 in trying to index the second compo 

nent of the array

ia

, which is a null reference.

10.7   Array Members

The members of an array type are all of the following:

The

public final

 field

length

, which contains the number of components

of the array (

length

 may be positive or zero)

The

public

 method

clone

, which overrides the method of the same name in

class

Object

 and throws no checked exceptions

All the members inherited from class

Object

; the only method of

Object

 that

is not inherited is its

clone

 method

An array thus has the same methods as the following class:

197