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/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
   public static void main(String[] args)
    {
        Demo d = new Demo(20);
        System.out.println(d.num);
    }
} class Demo
{
    final int num=10;
 
    public Demo(int n)
    {
        num = n;
    }
 
}

Main.java:8: error: class, interface, or enum expected
   public static void main(String[] args)
                 ^
Main.java:11: error: class, interface, or enum expected
        System.out.println(d.num);
        ^
Main.java:12: error: class, interface, or enum expected
    }
    ^
3 errors

Standard output is empty