看了书然后随便写了个测试,结果有问题,我新手,实在找不出问题所在,跪求前辈指点啊!!!!
import java.io.*;
class MakeException{
void g(){
try{
throw new FileNotFoundException();
}catch(Exception e){
throw new RuntimeException(e);
}
}
}
public class LostException{
public static void main(String[] args){
MakeException temp=new MakeException();
try{
temp.g();
}catch(RuntimeException re){
try{
throw re.getCause();
}
catch(FileNotFoundException e){
e.printStackTrace();
}
}
}
}
-----------------
错误提示是unreported exception java.lang.Throwable; must be caught or declared to be thrown throw re.getCause();
------解决方法--------------------------------------------------------
import java.io.*;
class MakeException{
void g(){
try{
throw new FileNotFoundException();
}catch(Exception e){
throw new RuntimeException(e);
}
}
}
public class Test{
public static void main(String[] args){
MakeException temp=new MakeException();
try{
temp.g();
}catch(RuntimeException re){
try{
throw re.getCause();//因为getCause返回的是个Throwable类型,所以必须对Throwable进行捕获
}
catch(FileNotFoundException e){
e.printStackTrace();
}
catch(Throwable t) //加上这句
{
}
}
}
}
------解决方法--------------------------------------------------------
因为你的re.getCause()返回的是一个
Throwable对象
虽然这个Throwable对象是FileNotFoundException
但是没有强制向下转型
所以要求catch捕捉Throwable的异常