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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
{
public class Base {        
private int x;        
public void Base() { x = 0; }
 public void inc() { x++; }    
 public int get() { return x; }
};
 
class FilhaUm extends  Base {    
private int x;        
public void FilhaUm() { x = 1; }    
public void inc() { x++; }        
};
 
class FilhaDois extends  Base {    
private int x;            
public void FilhaDois() { x = 2; }
public int get() { return x; }
};
 
 
class FilhaTres extends  Base {    
private int x;
public void FilhaTres() { x = 3; }
public  void inc() { x++; }
public  int get() { return x; }
};
 
 
 
 
 
 
 
	public static void main (String[] args) throws java.lang.Exception
	{
 
  Base p1 = new FilhaUm();
  Base p2 = new FilhaDois();
  Base p3 = new FilhaTres();    
  p1.inc();
  p2.inc();
  p3.inc();
  System.out.println(p1.get);
  System.out.println(p2.get);
  System.out.println(p3.get);
	}
}

Main.java:46: error: non-static variable this cannot be referenced from a static context
  Base p1 = new FilhaUm();
            ^
Main.java:47: error: non-static variable this cannot be referenced from a static context
  Base p2 = new FilhaDois();
            ^
Main.java:48: error: non-static variable this cannot be referenced from a static context
  Base p3 = new FilhaTres();    
            ^
Main.java:52: error: cannot find symbol
  System.out.println(p1.get);
                       ^
  symbol:   variable get
  location: variable p1 of type Ideone.Base
Main.java:53: error: cannot find symbol
  System.out.println(p2.get);
                       ^
  symbol:   variable get
  location: variable p2 of type Ideone.Base
Main.java:54: error: cannot find symbol
  System.out.println(p3.get);
                       ^
  symbol:   variable get
  location: variable p3 of type Ideone.Base
6 errors

Standard output is empty