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Editorial Team
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Asked: 2026-06-15T10:57:34+00:00

Looking at the answers to this question (link: How do I convert from int

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Looking at the answers to this question (link: How do I convert from int to Long in Java?), I used the following to compare long values (newUpdate, lastUpdate) with int value (Interval)

if ((newUpdate - lastUpdate) > Long.valueOf(interval))

I am not able to compile. What is the correct way to compare two different types?

More Info:

[INFO] Trace org.apache.maven.BuildFailureException: Compilation failure [145,51] operator > cannot be applied to long,java.lang.Long

Interval is of the type int.

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1 Answer

  1. Editorial Team

    If interval is an int, then just …

        if ((newUpdate - lastUpdate) > interval) { ...

    There is NO good reason to explicitly convert interval to a long in this context. The conversion will be done for you anyway.

    The expression Long.valueOf(Interval) returns a java.lang.Long rather than a long. If you needed to explicitly turn interval into a long, then you should cast it:

        if ((newUpdate - lastUpdate) > ((long) interval)) {

    The only thing that puzzles me about your example is why you get a compilation error when comparing a long and a Long. The Long should be auto-unboxed and the long, long version of the > operator should be used: reference JLS – 15.20.1 which says that numeric relational operators perform unboxing if required. The only explanation can be that you are compiling with the source level at 1.4 or earlier.

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