为什么会是0？大家看下

Question

public class Weekdays {
public static void main(String args[]) {

    try{
        for(int i=1 ;i<9; i++)
            System.out.println(i+"----"+giveName(i));
    }catch(InvalidIndexException e){System.out.println(e.toString());
    }
    finally{System.out.println("These days makes up a week.");
    }
}
public static String giveName(int d) throws InvalidIndexException{
    String name;
    switch(d){
        case 1:name="Monday    "; break;
        case 2:name="Tuesday   "; break;
        case 3:name="Wednesday "; break;
        case 4:name="Thursday  "; break;
        case 5:name="Friday    "; break;
        case 6:name="Saturday  "; break;
        case 7:name="Sunday    "; break;
        default:throw new InvalidIndexException();
    }
    return name;
}

}

class InvalidIndexException extends Exception {

private static final long serialVersionUID = 1L;
private int i;
void InvalidIndexExceptio(int a){
    i=a;
}
public String toString(){
    return i+"    is put of boundary-- 0<i<8 ";
}

}
打印结果

1----Monday

2----Tuesday

3----Wednesday
4----Thursday

5----Friday

6----Saturday

7----Sunday

[color=red]0[/color] is put of boundary-- 0<i<8 //[color=red]我认为i应该是8啊，为什么是0啊？[/color]These days makes up a week.

Answer 1

[code="java"]default:throw new InvalidIndexException(); [/code]