java设计模式之简单工厂模式详解
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。
1.抽象类
publicabstractclassPeople{
publicabstractvoiddoSth();
}
2.具体类
publicclassManextendsPeople{
@Override
publicvoiddoSth(){
System.out.println("I'maman,I'mcoding.");
}
}
3.具体类
publicclassGirlextendsPeople{
@Override
publicvoiddoSth(){
System.out.println("I'magirl,I'meating.");
}
}
4.工厂
publicclassPeopleFactory{
publicstaticPeoplegetSpecificPeople(Stringtype){
if("A-Man".equals(type)){
returnnewMan();
}elseif("B-Girl".equals(type)){
returnnewGirl();
}else{
returnnull;
}
}
}
5.测试代码
publicclassPeopleTestDemo{
publicstaticvoidmain(String[]args){
Peopleman=PeopleFactory.getSpecificPeople("A-Man");
Objects.requireNonNull(man,"对象不存在.");
man.doSth();
Peoplegirl=PeopleFactory.getSpecificPeople("B-Girl");
Objects.requireNonNull(girl,"对象不存在");
girl.doSth();
Peoplefoodie=PeopleFactory.getSpecificPeople("Foodie");
Objects.requireNonNull(foodie,"对象不存在");
foodie.doSth();
}
}
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