myexceptiondemo.java

java十大经典案例。打开Java相关文件

class MyException extends Exception{//自定义异常类
    public void printMsg(){
        System.out.println("exception: "+this.getMessage());
        this.printStackTrace();
        System.exit(0);
    }
}
public class MyExceptionDemo{
    public void calc(byte k) throws MyException{ //抛出异常
    	byte  y=1,i=1;
        System.out.print(k+"!=");
        for (i=1;i<=k;i++){
            if(y>Byte.MAX_VALUE/i)
                throw new MyException();
            else
                y = (byte)(y * i);
        }
        System.out.println(y);
    }
    public void run(byte k){//捕获并处理异常
        try{
            calc(k);
        }
        catch(MyException e){
            e.printMsg();
        }
    }
    public static void main (String args[]){
        MyExceptionDemo a = new MyExceptionDemo();
        for (byte i=1;i<10;i++)
            a.run(i);
    }
}