java 关于不兼容类型的错误：字符串无法转换为字符
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error about incompatible types: String cannot be converted to char
提问by Leo Lin
I create a method for Scanner:
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;
}
}
I try to print out for my choice. For Example:
我试着打印出来供我选择。例如：
System.out.println("Residencey:" + state);
I want when I type "Y or y" then the output is Residencey: In State.
我希望当我输入“Y 或 y”时，输出是 Residencey: In State。
And the Errors are:
错误是：
error: incompatible types: String cannot be converted to char
错误：不兼容的类型：字符串无法转换为字符
I don't know why, does java cannot return String or sentence? I'm a beginner in java, So I cannot use some difficult method.
我不知道为什么，java不能返回字符串或句子吗？我是java初学者，所以我不能使用一些困难的方法。
回答by Alice
If your requirement is char status = getStatus();I think your Class look like:
如果你的要求是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';
}
}
}
I hope it will help you :)
我希望它会帮助你:)
回答by Ashu Kanaujia
your method return type is char and you are returning string that's why it is showing error . Here is your code with correct return type
您的方法返回类型是 char 并且您正在返回 string 这就是它显示 error 的原因。这是具有正确返回类型的代码
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;
}
}
回答by Alice
Please change your method return type to String. Example
请将您的方法返回类型更改为String. 例子
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;
}
}
}
I changed your variable name.
我改变了你的变量名。
