an APK file is andrroid's version of a JRE file. it's the compiled android application. You cannot decode it in Netbeans and, unless it is your work or an open source project, then you are not legally aloud to decode it at all.
An .apk file is actually "just" a zip archive so you can open it using winzip or 7zip or similar tools. Another way is to rename the file from foo.apk to foo.zip and open it directly from windows explorer.
inside the archive are resources like icons, videos or sound that you might be able to open. However, other files are compiled or encoded in some way so you would need a decompiler to view them. As Android obfuscates code using proguard it is unlikely that the code you decompile will be much fun to look at
A nice tool that unzips and restores information from apk files is apktool
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