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项目中需要展示　星期几，没做过果断　百度一下，参考别人代码修改一下，整理存放以供学习扩展

public static String getWeekDay(int off) {        String result = new String("");        final Calendar instance = Calendar.getInstance();        instance.setTimeInMillis(System.currentTimeMillis());        int day = instance.get(Calendar.DAY_OF_WEEK);        int offDay = day + off;        switch (offDay % 7) {            case 0:                result = "周六";                break;            case 1:                result = "周日";                break;            case 2:                result = "周一";                break;            case 3:                result = "周二";                break;            case 4:                result = "周三";                break;            case 5:                result = "周四";                break;            case 6:                result = "周五";                break;        }        return result;    }

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