Update helloworld.java
Update helloworld.java

This Java hello world had three issues. I've fixed all three.
1. The public class name has to match the file name so I changed the classname to helloworld
2. The static keyword was misspelled
3. The java main method requires a String array param not a string (not a Java class).

Now you can run javac on helloworld.java and get a valid .class file you can then run with java helloworld.

Erik
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