return-mobile cannot be resolved to a variable為什麼啊？好心人幫忙啊

mobile cannot be resolved to a variable為什麼啊？好心人幫忙啊

class Factory3 extends Factory{
Material1 material1;
public Moblie createMobile(String choice){
if(choice=="蘋果"){
Moblie mobile=new IphoneMobile(material1);
}
if(choice=="三星")
{
Moblie mobile=new SamMobile(material1);
}
if(choice=="小米")
{
Moblie mobile=new MiMobile(material1);
}
return mobile;
}
}

最佳回答：

Moblie mobile = new Mobile();
看看