class YichangmianjiException extends Exception
{
private int shu;
private String ming;
YichangmianjiException(String ming,int shu)
{
this.ming=ming;
this.shu=shu;
}
public String getming()
{
return ming;
}
public int getShu()
{
return shu;
}
}
class Chang
{
public int Changmianji(int a,int b)throws YichangmianjiException
{
if(b<=0);
throw new YichangmianjiException("传进来的数小于等于零",b);
return a*b;
}
}
class Mianji
{
public static void main(String[] args)
{
Chang c=new Chang();
try
{
int x=c.Changmianji(4,5);
System.out.println(x);
}
catch (YichangmianjiException e)
{
System.out.println(e.getming());
System.out.println(e.getShu());
}
}
}

报错
错误: 无法访问的语句
return a*b;
^

这么没人呢