我很差劲

把问题说清楚点好吗？你这样子说太模糊了。

不要说自己不行，只不过你还没有敢于尝试。

yongswitch不就行了。

用swich里面就行了
    int i=0;
        switch(i)
        {
        case 0:
            System.out.println("周日");
            break;
        case 1:
            System.out.println("周一");
            break;
.......
        }

public class Test{
    public static void main(String[] args){
        int days = 6;
        String whatday = "";
        switch{
            case 0 : whatday = "星期日";
            break;
            case 1 : whatday = "星期一";
            break;
            case 2 : whatday = "星期二";
            break;
            case 3 : whatday = "星期三";
            break;
            case 4 : whatday = "星期四";
            break;
            case 5 : whatday = "星期五";
            break;
            case 6 : whatday = "星期六";
            break;
            default: whatday = "未知";

        }
        System.out.println(whatday);
    }
}