编译错误

为什么
public class Excep {

public static void main(String[] args)throws Exception {
	// TODO Auto-generated method stub
	/**/
	***List list = new ArrayList<>();***
	Animal dog=new Animal("yellow","Huang");
	Animal cat=new Animal("white","Hua");
	Animal rabbit=new Animal("black","Sheet");
	加粗的那一行会编译错误：
	Multiple markers at this line
- Cannot infer type arguments for 
 ArrayList<>
- The value of the local variable list is 
 not used
 按理来说，ArrayList是List的子类，是可以编译成功的啊。。。