Question

我为Scanner创建了一个方法：

public static char getStatus() {
   Scanner kb = new Scanner(System.in);
   System.out.print("You are in state student or not(yes for Y/y,no for N/n)");
   char state = kb.nextLine().charAt(0);
   if (state == 'Y'||state == 'y') {
      String instate  = "In State";
      System.out.println(instate);
      int statusfee = 5;
      return instate;
      } else if (state == 'N'||state == 'n') {
      String outstate = "Out-of-State";
      System.out.println(outstate);
      int statusfee = 5+2;
      return outstate;
      } else {
      String false = "FALSE";
      System.out.print(false);
      return false;
     }
   }

我尝试打印出来供我选择。例如：

System.out.println("Residencey:" + state);

我想输入“Y或y”时然后输出是Residencey：In State。

错误是：

错误：不兼容的类型：字符串无法转换为char

我不知道为什么，java不能返回String或句子吗？我是java的初学者，所以我不能使用一些困难的方法。

Answer 1

如果您的要求是char status = getStatus(); 我认为你的班级看起来像：

public class ScannerTest {
    public static void main(String[] args) {
        Scanner kb = new Scanner(System.in);
        char status = getStatus(kb);
        if (status == 'Y') {
            // System.out.println("In State");
        } else if (status == 'N') {

            // System.out.println("Out-of-State");
        } else {
            // System.out.println("FALSE");
        }
        System.out.println("Status is " + status);
    }

    public static char getStatus(Scanner kb) {

        System.out
                .print("You are in state student or not(yes for Y/y,no for N/n)");
        char state = kb.nextLine().charAt(0);
        if (state == 'Y' || state == 'y') {
            String instate = "In State";
            System.out.println(instate);
            int statusfee = 5;
            return 'Y';
        } else if (state == 'N' || state == 'n') {
            String outstate = "Out-of-State";
            System.out.println(outstate);
            int statusfee = 5 + 2;
            return 'N';
        } else {
            String myfalse = "FALSE";
            System.out.print(myfalse);
            return 'F';
        }
    }
}

我希望它会对你有所帮助:)。

Answer 2

你的方法返回类型是char，你返回的字符串是显示错误的原因。这是您的代码具有正确的返回类型

public static String getStatus () {
    Scanner kb = new Scanner (System.in);
    System.out.print ("You are in state student or not(yes for Y/y,no for N/n)");
    char state = kb.nextLine ().charAt (0);
    if ((state == 'Y') || (state == 'y')) {
        String instate = "In State";
        System.out.println (instate);
        int statusfee = 5;
        return instate;
    } else if ((state == 'N') || (state == 'n')) {
        String outstate = "Out-of-State";
        System.out.println (outstate);
        int statusfee = 5 + 2;
        return outstate;
    } else {
        String FALSE = "FALSE";
        System.out.print (false);
        return FALSE;
    }
}

Answer 3

请将您的方法返回类型更改为String。实施例

public class ScannerTest {
    public static void main(String[] args) {
        getStatus();
    }

    public static String getStatus() {
        Scanner kb = new Scanner(System.in);
        System.out.print("You are in state student or not(yes for Y/y,no for N/n)");
        char state = kb.nextLine().charAt(0);
        if (state == 'Y' || state == 'y') {
            String instate = "In State";
            System.out.println(instate);
            int statusfee = 5;
            return instate;
        } else if (state == 'N' || state == 'n') {
            String outstate = "Out-of-State";
            System.out.println(outstate);
            int statusfee = 5 + 2;
            return outstate;
        } else {
            String myfalse = "FALSE";
            System.out.print(myfalse);
            return myfalse;
        }
    }
}

我更改了您的变量名称。

有关不兼容类型的错误：String无法转换为char

3 个答案: