If Microsoft is also open-source and free in the future, is Java still competing for. Net?

The last time I attended the job fair, I saw that many large companies demanded to be proficient in Java. Unfortunately, I learned. Net in my freshman year, while Java was only available in the third year, and I only gave some basic knowledge. Sometimes I wonder if it's really wrong to select. Net? Java does have many advantages over. net. Open-source, cross-platform, free, and free development tools. In addition, if one day our country began to crack down on Pirated Windows users, I would like to switch to Linux for 90% of Chinese users. Net was like me at that time.ProgramYou have to lose your job. However, I thought that Linux could not be used in China. On the day of development, Microsoft would certainly have made windows open-source for free. After all, the Chinese accounted for 1/5 of the world's total, if Linux is used in China, the development of Linux and Java will become more intense.
It is still possible that Microsoft is open-source. Isn't net3.5 open-source? How nice it is to develop software like Windows for China when I was a child. I remember when I was a child, my dream was to be a scientist and contribute to my motherland. Now I think it was really naive. Now all I have learned about. NET is in windows. What can I do for my motherland? Now, the only thing we do is keep an eye on Microsoft's technological developments. As soon as new technologies emerge, we will find materials to learn, for fear that technology is outdated. Now my work cannot be guaranteed by my motherland, and my work depends on Microsoft! You must never shut down at Microsoft. I pray for you and wish you better and better.

Microsoft open source and free are my greatest dreams !!!