Hi all, I am want to know how an array looks like and I need a sample code. Basically i want to know how to add, delete and edit records using an Arraylist.
Can anybody help please?
Steven_C 0 Newbie Poster
Ezzaral 2,714 Posting Sage Team Colleague Featured Poster
Just read the API for ArrayList. The methods are quite clear. If you don't understand Collections at all, there is a lot of info here: Java Collections Framework
Steven_C 0 Newbie Poster
okay thanks :)
I will read em
awo 0 Newbie Poster
before you move to the API i guess you need to really get a hold on what an array is, if i may put it in any way an array is just a contiguous memory for similar data types and almost all programming languages support array in java you have to declear an array using the SYNTAX;
datatype [] objectname;
where datatype may be any of the primitve data types or an object,
eg;
int [] x;
String [] name;
the next thing is for you to initilize the size of the array after which these is done with the syntax
objectname= new [integer_value_of size];
eg.
x= new int[10];
name= new String [25];
you can now assing a value to each index in the array
x[0]=34;
x[1]=45;
x[2]=19;
x[3]=49;
x[4]=38;
NOTE :-the index goes from 0 to n-1, n which is the size of the array itself can not be used
jwenting 1,889 duckman Team Colleague
if you don't understand the question, don't try to answer. Array != ArrayList as you would have known had you read the documentation (but then, you tell people they shouldn't read the documentation and you clearly have followed your own advise...).
Be a part of the DaniWeb community
We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.