I am having a string like this
String abc = "{10,20}, {11,98}, {56,89}";

now i want to convert it to double dimensional array.
The elements may increase.
please help me.

store the pairs as arrays by all means, but if you are going to be changing the size of the overall array then you should definitely use a java.util.Vector.

In fact I'd use a vector for most arrays other than very simple ones.

Also remember that from java 1.4 you can use the split function to split a string into an array i.e. CSV to array:

String[] sCSVItems = "1,2,3".split(",");

Hopefully that's helpful