PS D:\code>  d:; cd 'd:\code'; & 'C:\Program Files\Java\jdk-21\bin\java.exe' '-XX:+ShowCodeDetailsInExceptionMessages' '-cp' 'C:\Users\HP\AppData\Roaming\Code\User\workspaceStorage\e78329faf78d6de71c82c7bc8ff5b7f2\redhat.java\jdt_ws\code_72e5cfe6\bin' 'helloworld' 
Exception in thread "main" java.lang.Error: Unresolved compilation problem: 
        helloworld cannot be resolved to a variable

        at helloworld.main(helloworld.java:4)