getClass和getResource的技术含义和使用

Question

I m new in programming. I watch online tutorials of Java and I came with this getClass().getResource() what is the technical use of these terms.Can anyone help me.

Answer 1

If you want to load some resource not using absolute/relate path of your file system, you should use the classloader. Your resource (for example icon.ico) can be packaged in foo.jar but some other icon with the same name can be also in bar.jar . The getClass().getResource() statement helps to specify where the classloader will look for.

Answer 2

getClass().getResource() will give you an URL to a file inside your jar. This is useful if your program depends of ie an datafile and you want to make sure it is always available. getClass().getResourceAsStream() is the same concept only it returns a stream.

Answer 3

getClass() is defined in the Object class to return the "runtime class of this Object". where as getResource() "finds a resource with a given name". for example if you pass getClass().getresource("sample.png") returned URL will be a File:// url for a sibling file with the name "sample.png". In short it gives the absolute path of the file in your directory.