AssertionError 跟一下那个类是 “is – a”的关系

1. RuntimeException
　　 2. Error
　　 3. VirtualMachineError
　　 4. IllegalAccessException
　　 5. Throwable 答案：
　　答案：2
　　 The class AssertionError is an Error, which denotes an “incorrect condition” as opposed to an “unusual condition” (Exception). Since, the class Error descends from Throwable, AssertionError also has “is-a” relationship with Throwable. Here is the hierarchy –
　　
　　 java.lang.Object
　　
　　 |
　　
　　 +-java.lang.Throwable
　　
　　 |
　　
　　 +-java.lang.Error
　　
　　 |
　　
　　 +-java.lang.AssertionError