型CとDが、可能性のあるすべてのインスタンスに対応します: コピー record Pair<T>(T x, T y) {} sealed interface I permits C, D {} record C(String s) implements I {} record D(String s) implements I {} static void exhaustiveSwitch(Pair<I> p) { switch (p) { case Pair<I...
switch(a){ case 1：case 2：case 3:case 4:System.out.println("不满⾜条件");break;case 5:case 6:System.out.println("输⼊学⽣性别");String c=dan.next();switch(c){ //'c'是字符，是⼀个常量，对其进⾏判断，下⾯的case 条件不会起作⽤ case "男":System.out.println("满...
以下是一个使用C++'switch' 语句的例子。这个例子将根据输入的数字来输出不同的星期名称。 '''cpp #include <iostream> #include <string> int main() { int day = 3; switch (day) { case 1: std::cout << "Monday" << std::endl; break; case 2: std::cout << "Tuesday" << std::endl;...
参数值类型必须是这几种类型之一:int,byte,char,short switch为什么只能用int,short,byte,char,而不能用long,String呢?因为switch 只能使用 int 类型或者是可以转换为 int类型的参数(char,char 和 int 通过ascii转换)。
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int day = 3; string dayName; switch (day) { case 1: dayName = "Monday"; break; case 2: dayName = "Tuesday"; break; case 3: dayName = "Wednesday"; break; case 4: dayName = "Thursday"; break; case 5: dayName = "Friday"; break; default: dayName = "Invalid day"; break; } ...
switch(expression) { case constant1://todo case constant2://todo case constant3://todo default://todo } 要注意：switch语句当中的expression只能是⼀个整数或者是枚举类型，不能是其他类型。⽐如像是string就不可 以作为switch语句的case，这个⾮常坑，很容易不⼩⼼写错。所以上⾯的if-else语句...
https://note.com/cyberz_cto/n/n26f535d6c575 https://github.com/typescript-eslint/typescript-eslint https://github.com/NotionX/react-notion-x https://zenn.dev/eagle/articles/ts-coproduct-introduction https://zenn.dev/uhyo/articles/ts-4-6-destructing-unions ...
private String name;private int index;private Color(String name, int index) { this.name = name;this.index = index;} public static String getName(int index) { for (Color c : Color.values()) { if (c.getIndex() == index) { return c.name;} } return null;} public String getName(...
char c= 'A'; switch(c){} char cc= 97; switch(cc){} //编译报错 类型不兼容 //switch(true){} String username="lisi"; switch(username){} 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18.