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Many operating systems are "old", and many are new. Without specific systems to compare, your question is unanswerable and meaningless.
In order to be answered, your question needs to mention the names of the operating systems to which you are referring.
Virtual operating system
yes
Operating systems (OS) are software that manage computer hardware and software resources while providing common services for computer programs. They act as an intermediary between users and the computer hardware. The main types of operating systems include batch operating systems, time-sharing operating systems, distributed operating systems, real-time operating systems, and network operating systems. Additionally, there are specialized operating systems for mobile devices, such as Android and iOS, as well as embedded systems used in various appliances.
When you network operating systems you will have the benefit of both operating systems. You have to ensure both systems are compatible before networking them.
Operating systems are not in applications. Applications are installed on Operating Systems.
what are the disadvantages of operating systems effects of information technology
several types of operating systems are there.
Single-user multitask operating systems are also known as network operating systems
Two operating systems are; Windows, and Linux.
The 'best' OS for java is a very subjective question. Some OS systems are more optimized than others for java.