Reading long binary numbers in java

I am trying to write a program which converts binary numbers into decimal, however as soon as I have a binary number which is bigger than 10 digits I get a java.lang.numberformatexception error. I was wondering how I should rewrite my code in order to handle binary numbers:

try{
                //will throw an exception if the user's input contains a non-Integer
                int inputNumber = Integer.parseInt(returnEnterNumber());
                //when our user wants to convert from binary to decimal
                if(binaryToDecimal.isSelected()){
                    //checks if number is binary
                    int checkNumber = inputNumber;
                    while (checkNumber != 0) {
                        if (checkNumber % 10 > 1) {
                            throw new InvalidBinaryException();
                        }
                        checkNumber = checkNumber / 10;
                    }
                    //converts from binary and outputs result
                    int n = Integer.parseInt(returnEnterNumber(), 2);
                    displayConvertedNumber(Integer.toString(n));
                }
            }
            catch(Exception e)  {
                displayConvertedNumber("WRONG INPUT! - TRY again");
            }