Arrays in Java

[hiranya]

I'm a bit confused about the way how arrays are declared and used in Java. Please enlighten me on how to declare and utilize arrays in Java.

[shanePreater]

Arrays are declared using the [] notation so to declare an array of String objects you would do the following:

Code:

String[] stringArray;

Now if you want to actually create the instance of the String array then you need to specify the size within the []'s:

Code:

String[] stringArray = new String[7];

This then gives you an empty container to place your String objects into the array:

Code:

stringArray[0] = "First";

etc etc.

Moving to something a bit more complex like your own classes the same prinicipal applies so if we had a class Bob which is constructed with a pair of string arguments it would be something like this:

Code:

Bob[] bobs = new Bob[7];
bobs[0] = new Bob("Some", "Data");
bobs[1] = otherBobVariable;

This is perfectly fine for fixed sized arrays but you may be better off using a collection instead and then using the collections toArray() methods to create your array when you need it.

Hope this helps.

[Seemster]

I personally use ArrayList instead of Arrays. You can use a helper method to convert the arraylist to an array. That way you don't have to set the initial or default size of the array. It also prevents OutofBound exceptions.

[Swamipsn]

Strong a[]="hai;
String n = new String[];
pls refer online tutorial for many types of arra declarations in java