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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 Catty{
int x =0;
public void printX(){
System.out.print(x);
}
}
class Kitten extends Catty{ 
int x = -1;
@Override
public void printX(){
System.out.print(x);
}
}
public class Cat {
public static void main(String[] args) {
Catty a=new Kitten();
a.printX(); 
}
}
}

Main.java:25: error: non-static variable this cannot be referenced from a static context
Catty a=new Kitten();
        ^
Main.java:24: error: Illegal static declaration in inner class Ideone.Cat
public static void main(String[] args) {
                   ^
  modifier 'static' is only allowed in constant variable declarations
2 errors

Standard output is empty