Convert Long into Integer

Question

How to convert a Long value into an Integer value in Java?

Answer 1

If you are using Java 8 Do it as below

    import static java.lang.Math.toIntExact;

    public class DateFormatSampleCode {
        public static void main(String[] args) {
            long longValue = 1223321L;
            int longTointValue = toIntExact(longValue);
            System.out.println(longTointValue);

        }
}

Answer 2

Integer i = theLong != null ? theLong.intValue() : null;

or if you don't need to worry about null:

// auto-unboxing does not go from Long to int directly, so
Integer i = (int) (long) theLong;

And in both situations, you might run into overflows (because a Long can store a wider range than an Integer).

Java 8 has a helper method that checks for overflow (you get an exception in that case):

Integer i = theLong == null ? null : Math.toIntExact(theLong);