Cannot convert String to Integer in Java [duplicate]

Answer 1

That's the correct method, but your value is larger than the maximum size of an int.

The maximum size an int can hold is 2³¹ - 1, or 2,147,483,647. Your value is 6,042,076,399. You should look at storing it as a long if you want a primitive type. The maximum value of a long is significantly larger - 2⁶³ - 1. Another option might be BigInteger.