你把周字去掉，單引號只能存字符。

char?today='日';
switch(today)?{
????case?'一'?:
????case?'三'?:
????case?'五'?:
????????System.out.println("早餐吃包子");
????????break;
????case?'二'?:
????case?'四'?:
????case?'六'?:
????????System.out.println("早餐吃油條");
????????break;
????case?'日'?:
????????System.out.println("吃主席套餐");
????????break;

}

你把case后面都加個空格 case '周日' 這樣