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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. */
class Ideone
{
	class Cat {
        private int a = 5;
        protected int b = 6;
        public int c = 7;
        }
 
        public class CatDemo {
        public static void main(String[] args) {
        Cat f = new Cat();
        System.out.print(" " + f.a);
        System.out.print(" " + f.b);
        System.out.print(" " + f.c);
         }
    }
 
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
	}
}

Main.java:18: error: non-static variable this cannot be referenced from a static context
        Cat f = new Cat();
                ^
Main.java:17: error: Illegal static declaration in inner class Ideone.CatDemo
        public static void main(String[] args) {
                           ^
  modifier 'static' is only allowed in constant variable declarations
2 errors

Standard output is empty