Both JAR and CAB files are basically archives so you could actually convert them between each other. However this will just repack the files and nothing more. In case of installation packages for mobile devices they will no longer work. You would need a dedicated converter for that.
Convert Compressed archive file package for Java classes and data to Windows Cabinet Compressed Archive.
We have found 3 software records in our database eligible for .jar to .cab file format conversion.
Microsoft Windows software - convert jar to cab on Windows
A free file archiver developed by Igor Pavlov featuring higher compression ratios with LZMA and LZMA2 compression.
It is mainly available for Windows platform (for Mac and Linux are available command line tools) and is the primary program to handle 7z archives. However, also supports various compression file formats.
Packing / unpacking: 7z, XZ, BZIP2, GZIP, TAR, ZIP and WIM
Unpacking only: AR, ARJ, CAB, CHM, CPIO, CramFS, DMG, EXT, FAT, GPT, HFS, IHEX, ISO, LZH, LZMA, MBR, MSI, NSIS, NTFS, QCOW2, RAR, RPM, SquashFS, UDF, UEFI, VDI, VHD, VMDK, WIM, XAR and Z
Convert from jar file
to cab file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned jar to cab. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
FilZip will compress and decompress ACE, ARC, ARJ, BH, XXE, ZOO, ZIP, and others. FilZip includes a simple six-option context menu interface to unarchive files. Easily selected options include extracting in place, to a new directory, e-mailing or testing it. FilZip includes the many archive options expected in current tools.
ALZip is compression utility that supports about 40 archive file formats. ALzip can open ALZ, ACE, EGG, RAR, ZIP etc.. Also can open disk images, such as ISO and BIN, LCD. ALZip is able to recovery passwords in protected ZIP archives.