java自定义异常

自定义异常

class ChushulingException extends Exception
{
public ChushulingException(String msg)
{
super(msg);
}
}

class ChushufuException extends Exception
{
public ChushufuException(String msg)
{
super(msg);
}
}

/*自定义异常 End*/

class Numbertest
{
public int shang(int x,int y) throws ChushulingException,ChushufuException
{
if(y<0)
{
throw new ChushufuException("您输入的是"+y+",规定除数不能为负数!");//抛出异常

}
if(y==0)
{
throw new ChushulingException("您输入的是"+y+",除数不能为0!");
}

int m=x/y;
return m;
}
}

class Rt001
{
public static void main(String[]args)
{
Numbertest n=new Numbertest();

//捕获异常

try
{
System.out.println("商="+n.shang(1,-3));
}
catch(ChushulingException yc)
{
System.out.println(yc.getMessage());
yc.printStackTrace();
}
catch(ChushufuException yx)
{
System.out.println(yx.getMessage());
yx.printStackTrace();
}
catch(Exception y)
{
System.out.println(y.getMessage());
y.printStackTrace();
}

finally{ System.out.println("finally!");} ////finally不管发没发生异常都会被执行

}
}

/*
[总结]

1.自定义异常:

class 异常类名 extends Exception
{
public 异常类名(String msg)
{
super(msg);
}
}

2.标识可能抛出的异常:

throws 异常类名1,异常类名2

3.捕获异常:
try{}
catch(异常类名 y){}
catch(异常类名 y){}

4.方法解释
getMessage() //输出异常的信息
printStackTrace() //输出导致异常更为详细的信息

*/

总结