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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 static void main (String[] args) throws java.lang.Exception
	{
		   /*1*/ A a = new A();
   /*2*/ B b = new B();
   /*3*/ A c = new B();
   /*4*/ A d = new B(0);
   /*5*/ B e = new B(8);
   /*6*/ B.metodaA();
   /*7*/ B.metodaB();
   /*8*/ B f = new B(-1); f.metodaA();
   /*9*/ B g = new B( 0); g.metodaC();
  /*10*/ A h = new A();   h.metodaB();
	}
}
 
abstract class A {
   abstract void metodaA();
            void metodaB(){}
}
class B extends A {
   private int z;
   static void metodaC(){}
          void metodaA(){}
   B(int i) {
      z = i;
   }
   B(){
      z = 0;
   }
}

Main.java:12: error: A is abstract; cannot be instantiated
		   /*1*/ A a = new A();
		               ^
Main.java:17: error: non-static method metodaA() cannot be referenced from a static context
   /*6*/ B.metodaA();
          ^
Main.java:18: error: non-static method metodaB() cannot be referenced from a static context
   /*7*/ B.metodaB();
          ^
Main.java:21: error: A is abstract; cannot be instantiated
  /*10*/ A h = new A();   h.metodaB();
               ^
4 errors

Standard output is empty