class Exception1 extends Exception
{
public Exception1( String msg )
{
super( msg );
}
}
class Exception2 extends Exception
{
public Exception2( String msg )
{
super( msg );
}
}
class Exception3 extends Exception
{
public Exception3( String msg )
{
super( msg );
}
}
public class Test7
{
public static void f() throws Exception1,Exception2,Exception3
{
throw new Exception1( "Exception1 " );
throw new Exception2( "Exception2 " );
throw new Exception3( "Exception3 " );
}
public static void main( String[] args )
{
try
{
f();
}
catch ( Exception e )
{
e.printStackTrace();
}
}
}
编译显示：unreachable statement
------解决方法--------------------------------------------------------
throw new Exception1( "Exception1 " );
throw new Exception2( "Exception2 " );
throw new Exception3( "Exception3 " );
不能这样用啊!第一个THROW后不能再有其它语句了,因为方法中止了.
------解决方法--------------------------------------------------------
public static void f() throws Exception1,Exception2,Exception3
{
throw new Exception1( "Exception1 " );
throw new Exception2( "Exception2 " );
throw new Exception3( "Exception3 " );
}
成员函数f()已经抛出Exception1,Exception2,Exception3，方法内又抛出一遍，不多余吗？
------解决方法--------------------------------------------------------
题目的意思是让你在那个方法里 先捕获这3种异常 然后再抛出
如：
try{
}catch(Exception1 ex1){
```````````````````````
````````````````````执行体
throw new Exception1( "message ");
}catch(Exception2 ex2){
throw new Exception2( "message ");
}catch(Exception2 ex3){
throw new Exception3( "message ");
------解决方法--------------------------------------------------------
throw new Exception1( "Exception1 " );
throw new Exception2( "Exception2 " );
throw new Exception3( "Exception3 " );
执行第一条后 方法就会退出 后面两条没有执行的可能。
所以报错
------解决方法--------------------------------------------------------
to lz:题目要求的是main函数里只能用一个catch，没说f()里面只能用一个catch子句
yifengtpf()的方法是可行的。
public static void f() throws Exception1,Exception2,Exception3
{
throw new Exception1( "Exception1 " );//以后的两行代码都是不可达代码
throw new Exception2( "Exception2 " );
throw new Exception3( "Exception3 " );
}
