Java is a application programming. So we can't control any hardware directly with Java. But it can be done with C, C++ like system programmes. So network sniffers can be created with system programming but not with Java.
But here comes a Java utility Jpcap, that enables us to do this. It uses C base files that uses operating system specific native functions to control the network. Using this you can capture all the packets received by a computer through a Java program. And it enables filtering packets. It supports most of the common packets used in networks.
Just search Jpcap in Google. You can get more about it.
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