简单工厂模式：由一个工厂对象决定创建出哪一种类的实例。
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1.抽象类
public abstract class People {
public abstract void doSth();
}
2.具体类
public class Man extends People{
@Override
public void doSth() {
System.out.println("I'm a man,I'm coding.");
}
}
3.具体类
public class Girl extends People{
@Override
public void doSth() {
System.out.println("I'm a girl,I'm eating.");
}
}
4.工厂
public class PeopleFactory {
public static People getSpecificPeople(String type){
if("A-Man".equals(type)){
return new Man();
}else if("B-Girl".equals(type)){
return new Girl();
}else {
return null;
}
}
}
5.测试代码
public class PeopleTestDemo {
public static void main(String[] args) {
People man = PeopleFactory.getSpecificPeople("A-Man");
Objects.requireNonNull(man,"对象不存在.");
man.doSth();
People girl = PeopleFactory.getSpecificPeople("B-Girl");
Objects.requireNonNull(girl,"对象不存在");
girl.doSth();
People foodie = PeopleFactory.getSpecificPeople("Foodie");
Objects.requireNonNull(foodie,"对象不存在");
foodie.doSth();
}
}
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