Question

Lets say i’m reading PDF file or using web broswer and i hilighted a word.

I want a procedure in JAVA , procedure in an independent program , to get that selected text
using my JAVA program.

Answer 1

It sounds as if the other program will be “active” and have focus, and that you are desiring to use Java in the background to capture the selected text, perhaps using a hotkey combination.

Java may not be the best tool for this sort of behavior. Since Java is built to be as OS-agnostic as possible, it is difficult to do OS-specific tasks with Java. Having said this, this can be done with Java but would involve “stretching” Java and using non-Java code integrated with Java via JNI, JNA, or a OS-specific utility bridge such as AutoIt V3 if this is for a Windows platform. This solution would of course be OS-specific and could not be used in a cross-platform fashion.

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Edit 1
You state in a comment:

Thank you .. But how to use JNI OR JNA to do that ?

@blackgh: and therein lies the rub. You need to first learn JNI (more difficult if you’re not already familiar with C or C++) or JNA (which in my opinion is easier), and then learn to make a keyboard hook if you want to make a hot key. This would take a bit of time and effort to do, but is doable. If this were my project, and I needed to do it quick and it absolutely had to integrate with Java, and if it were for a Windows platform, I’d go with AutoIt V3 or something similar to create a script for the hot key as the easiest solution, and in fact I’ve done something like this, but again you’d need to learn the the AutoIt language (it’s like Basic).