blic?class?HelloWorld?{

這里是public

public?class?HelloWorld?{

swyitch(today){

這里是switch

switch(today){

還有把所有的case語句后面的引號改成單引號，因為之前定義的變量today是字符型,不是字符串型；或者把之前的變量today定義為字符串型String。

參考代碼一

public?class?HelloWorld?{

????public?static?void?main(String[]?args)?{
????String?today="日";
???????switch(today){
????????case"一":
????????case"三":
????????case"五":
????????????System.out.println("吃包子");
????????????break;
????????case"二":
????????case"四":
????????case"六":
????????????System.out.println("吃油條");
????????break;
????????default:
????????System.out.println("吃主席套餐");
?????}
????????
????}
}

參考代碼二：

public?class?HelloWorld?{

????public?static?void?main(String[]?args)?{
????char?today='日';
???????switch(today){
????????case'一':
????????case'三':
????????case'五':
????????????System.out.println("吃包子");
????????????break;
????????case'二':
????????case'四':
????????case'六':
????????????System.out.println("吃油條");
????????break;
????????default:
????????System.out.println("吃主席套餐");
?????}
????????
????}
}