JAVA illegal start of type

by 
class rand_number
{
    //...    
    if(rand_n == 2) 
    {
        boolean guessed = true;
    }
}

You can only have field declarations at the class level. An if statement like this needs to be in a method, constructor, or initializer block.

You could eliminate the if statement like this:

boolean guessed = rand_n == 2;

But I question why you have any desire to set this value at creation time at all, as opposed to in response to some user action.

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