Question

I have a string i want to split it into half?

String Data = "This is a string"

This is an example string. In the real case i will not know what is inside the string, how long it is etc

Answer 1

String data = "This is a string";
String half1 = data.subString(0, data.length() / 2);
String half2 = data.subString(data.length()/2);

Also, remember that Strings are immutable, you can’t just call data.subString(data.length()/2); and expect that data will be changed. You have to assign the returned String to some variable (as in my example).