Question

我从输入中读取的字符串会跳过所有开关案例并直接转到默认情况。当我执行String s = in.readLine（）。trim（）时，它会进入所有情况并打印每个案例，例如“HELLO”输入打印英语，俄语，德语等。

import java.io.IOException;

class Main implements Runnable {

public static void main(String[] args) {
    Main main = new Main();
    main.run();

}

   @Override
   public void run() {

      ExecutorTemplate exe = new ExecutorTemplate();
      exe.run();

   }

}

class ExecutorTemplate implements Runnable {

@Override
public void run() {

    String s = readLine();
    int casenr = 1;
    while(!s.equals("#")){
        switch(s){
            case "HELLO":
                System.out.printf("Case %d: %s\n",casenr++,"ENGLISH");
            case "HOLA":
                System.out.printf("Case %d: %s\n",casenr++,"SPANISH");
            case "HALLO":
                System.out.printf("Case %d: %s\n",casenr++,"GERMAN");
            case "BONJOUR":
                System.out.printf("Case %d: %s\n",casenr++,"FRENCH");
            case "CIAO":
                System.out.printf("Case %d: %s\n",casenr++,"ITALIAN");
            case "ZDRAVSTVUJTE":
                System.out.printf("Case %d: %s\n",casenr++,"RUSSIAN");
            default:
                System.out.printf("Case %d: %s\n",casenr++,"UNKNOWN");
        }
        s = readLine();
    }
}

从标准输入读取的方法

private String readLine() {

    byte line[] = new byte[255];
    int length = 0;
    int input = -1;
    try {
        while (length < 255) {// Read until maxlength
            input = System.in.read();
            if ((input < 0) || (input == '\n')) {
                break; // or until end of line ninput
            }
            line[length++] += input;
        }

        if ((input < 0) && (length == 0)) {
            return null; // eof
        }
        return new String(line, 0, length);
    } catch (IOException e) {
    return null;
    }
  }
}

Answer 1

问题是你忘记了休息声明。

有关中断的switch语句，请参阅此示例：

break;

select t1.user as user1, t2.user as user2, t3.user as user3 from users_entities t1 left outer join users_entities t2 on t1.entity = t2.entity left outer join users_entities t3 on t2.entity = t3.entity where t1.user = 122退出了switch语句。如果没有它，执行将继续执行，并转到下一个语句。

Uva的12250 - 语言检测

1 个答案: