If you're running this within netbeans, this error can't/shouldn't occur (then you did quite a number on how you managed to misconfigure this project!). If you're running it from the command line:
cd ..
java pragnya.Pragnya
Alternatively, assuming JDK11+, you can just run java Pragnya.java
(not javac, then java - just java
the source file).
Read up on packages and classpath structure if you want to know why you need to it this way.
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