工厂设计模式

interface Fruit{
public void eat();

}

class Apple implements Fruit{
public void eat() {
System.out.println("吃苹果");
}

}

class Orange implements Fruit{
public void eat() {
System.out.println("吃橘子");
}

}

class Factory{
public static Fruit getInstance(String classname){
Fruit f = null;
if("apple".equals(classname)){
f = new Apple();
}
if("orange".equals(classname)){
f = new Orange();
}
return f;
}

}

public class Test {

public static void main(String[] args) {

Fruit f = null;
f = Factory.getInstance("apple");
f.eat();

}

}

运行结果：

吃苹果