public class RunTest{
public static void main(String[] args) {
Integer ten=new Integer(10);
Long nine=new Long(9);
System.out.println(ten+nine);
int i=1;
System.out.println(i+ten);
}
}
大家觉得这道题会输出什么？会不会Error？
刚开始我看到的答案是：Error，解释如下：
The wrapper classes cannot be used like primitives.
Wrapper classes have similar names to primitives but all start with upper case letters.Thus in this case we have int as a primitive and Integer as a wrapper.
The objective do not specifically mention the wrapper classes but don't be surprised if they come up .
但是当我真正在试验之后发现竟然可以输出：19、11；
想了想，可能此题是jdk1.4时候的吧，自从v5之后自动拆装箱，就可以输出结果了，应该是这样的。
大家也讨论下。