求关于抽象类的java 题目，大虾们帮小弟了！！！

**********************Fruitjava****************************
public abstract class Fruit {
abstract public void outmessage();
}

**********************Apple.java****************************
public class Apple extends Fruit {
private String color;

private String productingArea;

private String crown;

public Apple() {
this.color = "red";
this.productingArea = "China";
this.crown = "Autumn";
}

public void outmessage() {
System.out.println("The color of the apple is " + color);
System.out.println("The producting area of the apple is " + productingArea);
System.out.println("The color of the apple is " + crown);

}

public String getColor() {
return color;
}

public void setColor(St