"Hello, world!" - Could not find or load main class

You are missing one "}" at the end of the program

public class Hello 
{
    public static void main (String args[]) 
    {
       System.out.println ("Hello World!");
    }
}

and then try

java -cp . Hello

try this one:

java -cp . Hello

try

java -cp . Hello

I think you do not have the current directory on your classpath

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