[1] Which would be better C++ or Java when building Desktop Applications/Softwares?
[2] Which would be better to use Java Swing or JavaFX?
Please answer them by their number
I used JAVAFX to make the applications for my academic projects. I will vouch for JAVA and JAVAFX. Can you tell the nature of your application though? Perhaps something better can be possible as well 
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I have learn the c++ coding please tell me.
How can i better learning for c++?
I have completed my Java from https://www.w3schools.in/java-tutorial can is it sufficient to start Learning Swing or JavaFX?
Java swing etc. is basically GUI programming. Not very difficult, I myself learned by directly jumping into it. The only thing is, you may refer to a few tutorials for syntax and noting down good practices, but thats it.
the JavaFX is made to replace Swing right ?
Iām assuming that you are asking how to become better at writing programs using C++.
I would suggest that you learn the basic syntax, then practice as many problems as you can using C++.
When you get stuck at some point, look at how others have solved the problem using C++.
This will help you identify your mistakes as well as teach you better coding practices in your language.