Files under /usr/bin not able to delete

It is not possible to delete required system components. I understand you are a developer, but you have to work within a developer environment — not on macOS itself.

Read About System Integrity Protection on your Mac - Apple Support: /usr/bin/ is off-limits.

A workaround that may work for you is to partition your Mac's startup disk into a many partitions as you need to install multiple Java versions. You will need to boot each one separately.

Partition a physical disk in Disk Utility on Mac - Apple Support

Change your Mac startup disk - Apple Support

As a Java developer. you should be familiar with the hoops for running multiple versions of Java on your system. The way to do this has been well known for year (and it applies to all OSes, not just MacOS).

The short version is that you need to install other Java versions in parallel (e.g. in /usr/local/bin, or anywhere else you prefer), then either invoke the specific version of Java you want at run time (by providing the full path of the javac binary you want to use), or set your $JAVA_HOME environment variable to provide a hint.

Repeatedly removing and reinstalling Java versions on a regular basis is not something that most people are prepared to do.

> Please suggest way to delete the file and I don't like apple controlling my Mac book so tightly

Short version: wipe your drive and install some other OS.

Apple have long marched down a part of locking down parts of the OS to prevent unauthorized change to parts of the file system.

In 99% of cases nobody notices

In 0.99% of the rest of the cases those changes prevent malware or malicious activity directed towards the system - at least to the point where it acts as a barrier to malware and users have to go out of their way (at least to authenticate and acknowledge the change) before changes can be made. That's helped maintain the perception of MacOS being a more secure OS than others.

The remaining 0.001% of cases are users like yourself who demand absolute control over their filesystem, no matter what the advantages or disadvantages may be. At the end of the day, Apple are not catering to the 0.001%, so if that's a hill you're prepared to die on, you'll need to find another platform to do it on.

Yes, you can do it - you can disable all the OS protections, file system security and whatnot, and install whatever binary you want in the place of /usr/bin/javac, but it will slow you down every time you need to switch Java versions - most people would follow the standard model of installing multiple Java versions that have existed for years and get on with the job of coding.

The problem you want to solve is not clear to me. If you do not want Java on your Mac then uninstall it according to its instructions: https://www.java.com/en/download/help/mac_uninstall_java.html

As it states, "Do not attempt to uninstall Java by removing the Java tools from /usr/bin. This directory is part of the system software and any changes will be reset by Apple the next time you perform an update of the OS."

Then, if you need Java or the JDK install the version you want: https://docs.oracle.com/javase/8/docs/technotes/guides/install/mac_jdk.html