nextDouble() 不接受点，只接受逗号

Question

输入如下:

185.50 163.45 250.36


535.20 450.38 950.22


1

它给了我这个:

Exception in thread "main" java.util.InputMismatchException<br>
at java.base/java.util.Scanner.throwFor(Scanner.java:939)<br>
at java.base/java.util.Scanner.next(Scanner.java:1594)<br>
at java.base/java.util.Scanner.nextDouble(Scanner.java:2564)<br>
at Pruebas.Ventas.main(Ventas.java:25)

但是如果我输入这个:

185年,
250, 36
163, 45
535, 20
950, 38岁的22
450
1

它工作完美!为什么?

import java.util.Scanner;
public class Ventas {
public static void main(String[] args) {

Scanner scan = new Scanner(System.in);
double numero = 0;
double grande = 0;
double pequeno = 0;
double suma = 0;
double media = 0;
String comprobacion = "";
int grandePos = 0;
int pequenoPos = 0;
String[] semana = {"Martes", "Miercoles", "Jueves", "Viernes", "Sabado", "Domingo"};
while(numero != -1) {
double[] dias = new double[6];
for (int i = 0; i < dias.length; i++) {
numero = scan.nextDouble(); // This is line 25!
suma += numero;
if(numero != -1) {
dias[i] = numero;
if(numero > grande) {
grande = numero;
grandePos = i;
}else if(pequeno == 0 || numero < pequeno) {
pequeno = numero;
pequenoPos = i;
}
}else {
break;
}
}
media = ((suma - dias[5]) / 5);
if(media < dias[5]) {
comprobacion = "NO";
}else {
comprobacion = "SI";
}
}

System.out.println(semana[grandePos] + " " + semana[pequenoPos] + " " + comprobacion);
scan.close();
}
}

Answer 1

您的默认区域设置使用逗号字符(,)作为小数分隔符，因此无法将带有小数点(.)的输入解析为双精度。您可以通过显式设置接受小数点的Locale来覆盖此行为。例如:

Scanner scan = new Scanner(System.in);
scan.useLocale(Locale.US);