exception測試

class Propagate{
    public static void main(String[] args){
        try{
            System.out.println(new Propagate().reverse(""));
        }catch(ArithmeticException e){
            System.out.println("Input error!");
        }finally{
            System.out.println("The main method is done.");
        }
    }
   
    String reverse(String s){
        String reverseStr = "";
       
        if(s.length() == 0)    throw new ArithmeticException();
        else{
            for(int i=s.length()-1; i>=0; --i){
                reverseStr += s.charAt(i);
            }
        }
        return reverseStr;
    }
}



＝＝＝＝＝＝＝＝＝＝＝
reverse("Hello")
olleH
The main method is done.


reverse("")
Input error!
The main method is done.

例外是隨便挑一個做throw