Java开发网 - 何为unreachable statement ?

Topic: 何为unreachable statement ?

1.何为unreachable statement ?

Posted by: chuxueaihaozhe
Posted on: 2005-07-15 21:53

public class MultiCatch
{
public static void main(String[] args) throws ArithmaticException,ArrException
{
try
{
int a = args.length;
int b = 42/a;
int [c] = {1};
c[44] = 99;
ArithmaticException e = new ArithmaticException();
throw e;
ArrException x = new ArrException();
throw x;
}
catch(ArithmaticException e)
{
System.out.println("div by 0:" + e);
e.getMessage();
}
catch(ArrException x)
{
System.out.println("arry index oob:" + x);
}
}
}
class ArithmaticException extends Exception{}
class ArrException extends Exception{}
===================================
c:\myclass>javac MultiCatch.java
MultiCatch.java:13:unreachable statement
ArrException x = new ArrException();
^
1 error

2.Re:何为unreachable statement ? [Re: chuxueaihaozhe]	Copy to clipboard
Posted by: why Posted on: 2005-07-15 23:05 You've already throw e; for sure it is unreachable I think you mean if (condition) { throw e; }

3.Re:何为unreachable statement ? [Re: chuxueaihaozhe]	Copy to clipboard
Posted by: Jayzz Posted on: 2005-07-17 18:48 ArithmaticException e = new ArithmaticException(); throw e; //这里必定抛出异常 ArrException x = new ArrException(); //导致下面的语句不能执行 throw x;