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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 Animal{ void speak(){ System.out.println("speak"); } } 
class Dog extends Animal{ void speak(){ System.out.println("woof!"); } }
class Cat extends Animal{ void speak(){ System.out.println("meow!"); } }
public class AnimalTest{ 
 public static void main( String[] args ){ 
   Animal[] animals = new Animal[3]; 
   animals[0] = new Animal(); 
   animals[1] = new Cat(); 
   animals[2] = new Dog(); 
   for( int i=0; i < animals.length; i++ ) 
     animals[i].speak(); 
 } 
}}

Main.java:16: error: non-static variable this cannot be referenced from a static context
   animals[0] = new Animal(); 
                ^
Main.java:17: error: non-static variable this cannot be referenced from a static context
   animals[1] = new Cat(); 
                ^
Main.java:18: error: non-static variable this cannot be referenced from a static context
   animals[2] = new Dog(); 
                ^
Main.java:14: error: Illegal static declaration in inner class Ideone.AnimalTest
 public static void main( String[] args ){ 
                    ^
  modifier 'static' is only allowed in constant variable declarations
4 errors

Standard output is empty