如何使用掃描器處理由無效輸入(InputMisameException)引起的無限循環(huán)所以，我被這段代碼卡住了：import java.util.InputMismatchException;import java.util.Scanner;public class ConsoleReader {
Scanner reader;
public ConsoleReader() {
reader = new Scanner(System.in);
//reader.useDelimiter(System.getProperty("line.separator"));
}
public int readInt(String msg) {
int num = 0;
boolean loop = true;
while (loop) {
try {
System.out.println(msg);
num = reader.nextInt();
loop = false;
} catch (InputMismatchException e) {
System.out.println("Invalid value!");
}
}
return num;
}}這是我的輸出：插入整數：無效值！插入整數：無效值！...
4 回答
牧羊人nacy
TA貢獻1862條經驗 獲得超7個贊
當掃描器拋出InputMisameException時，掃描器將不會傳遞導致異常的令牌，從而可以通過其他方法檢索或跳過該令牌。
intInputMismatchExceptionreader.nextInt()reader.next()catch
...} catch (InputMismatchException e) {
System.out.println("Invalid value!");
reader.next(); // this consumes the invalid token}
精慕HU
TA貢獻1845條經驗 獲得超8個贊
String line = reader.nextLine();Scanner sc = new Scanner(line);
public int readInt(String msg) {
int num = 0;
boolean loop = true;
while (loop) {
try {
System.out.println(msg);
String line = reader.nextLine();
Scanner sc = new Scanner(line);
num = sc.nextInt();
loop = false;
} catch (InputMismatchException e) {
System.out.println("Invalid value!");
}
}
return num;
}
料青山看我應如是
TA貢獻1772條經驗 獲得超8個贊
讀取器獲得非int字符時退出 EOF時退出
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