How to declare 32-bit integers in Java?

I am looking for a Java application running on 32 - bit and 64 - bit systems, which mainly deals with IP addresses These IP addresses are kept as integers, and normal types waste a lot of memory on 64 bit platforms (yes, memory usage has proved to be a problem) Even on x64 architecture, how to declare that 32-bit integer values remain at 32 bits?

Because I am a novice in Java, if there is a built-in type that has been designed to handle IP addresses, please point out me at any time;)

Solution

Java has a specific data type width to achieve portability Even on 64 - bit platforms, integers are 32 - bit wide The Java language specification status is quiet clear (in my opinion, it is slightly more readable):

This can be said to be due to many portability problems found in C. they have different widths (even coding, such as two complements, one complement and symbol / amplitude). These integers are what Java wants to avoid, especially because it means that multiple different platforms can be run as much as possible

As for the built-in types used to handle IP addresses, Java has inet4address and inet6address, depending on your needs (and their common ancestor, InetAddress)