JAVA
java
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// SUMMARY BELOW
public class Program
{
public static void main(String[] args) {
dog doggo = new dog();
doggo.speak();
doggo.goToSleep();
cat kitty = new cat();
kitty.speak();
kitty.goToSleep();
mobile mob = new mobile();
mob.goToSleep();
}
}
abstract class Animal{
String sound;
void speak()
{
System.out.println(sound);
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OUTPUT
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