how to convert string to int in java? we have this string value : String str = "336299654785"; and we need to convert it to integer in java how we can do this?

If we have an integer variable value "1530" and we want to convert it into a string in java how can we do this ?

I have this variable string String oraaskStr="Oraask"; and i want to find a character at index 4 and store it into character variable.