什么是工厂模式?有没有用工厂模式解决实际问题?

什么是工厂模式?有没有用工厂模式解决实际问题?

工厂模式的思想主要为：多个类似的子类继承同一个父类，对其父类中的变量进行操作；工厂类负责判断、控制哪个子类被执行，而工厂类调用子类完成后，返回的结果是该子类的父类，该父类中的变量已经被操作过了，访问该父类，得到我们想要的结果
例如：
public interface Fruit {
void grow();//生长
void harvest();//收获
void plant();//种植
}
public class Apple implements Fruit{
private int treeAge;
public void grow() {
System.out.println(Apple is growing);
}
public void harvest() {
System.out.println(Apple has been harvested);
}
public void plant() {
System.out.println(Apple has been planted);
}
public int getTreeAge()
{
return treeAge;
}
public void setTreeAge(int age)
{
this.treeAge=age;
}
}
public class Grape implements Fruit {
private boolean seedless;
public void grow() {
System.out.println(Apple is growing);
}
public void harvest() {
System.out.println(Apple has been harvested);
}
public void plant() {
System.out.println(Apple has been planted);
}
public boolean getSeedless()
{
return seedless;
}
public void setSeedless(boolean seed)
{
this.seedless=seed;
}
}
public class FruitGardener {
public static Fruit factory(String which) throws BadFruitException
{
if(which.equalsIgnoreCase(apple)) {
return new Apple();
}
else if(which.equalsIgnoreCase(grape))
{
return new Grape();
}
else
{
throw new BadFruitException(Bad Fruit request);
}}
}
public class BadFruitException extends Exception{
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感谢回答