Java错误“ java.util.InputMismatchException” [重复]

Question

此问题已经在这里有了答案：

• Java Scanner - why do I get this error? [closed]1个答案

这是我尝试的Java代码：

import java.util.*;
public class gravity {
public static void main(String[] Args) {
System.out.println("Gravity is made by dev to calculate Gravitational force between two objects in approx");
double a, b, d, g;
Scanner in = new Scanner("System.in");
System.out.println("Enter mass of first object in Kg");
a = in.nextDouble();
System.out.println("Enter mass of second object in Kg");
b = in.nextDouble();
System.out.println("Enter distance between them");
d = in.nextDouble();
g = (6.67 * a * b) / (10000 * 10000 * 1000 * d * d);
System.out.println("Gravitational force is "+ g +"N approx");
}
}

我使用：javac gravity.java对其进行了编译它编译成功，但是使用java gravity运行时出现以下错误：

Gravity is made by dev to calculate Gravitational force between two objects in approx
Enter mass of first object in Kg
Exception in thread "main" java.util.InputMismatchException
        at java.base/java.util.Scanner.throwFor(Scanner.java:939)
        at java.base/java.util.Scanner.next(Scanner.java:1594)
        at java.base/java.util.Scanner.nextDouble(Scanner.java:2564)
        at gravity.main(gravity.java:8)

我在做什么错？

Answer 1

请参阅Read input line by line，以更好地使用System.in上的扫描仪。目前，您的代码正在文本“ System.in”

Answer 2

请参阅Read input line by line，以更好地使用System.in上的扫描仪。目前，您的代码正在文本“ System.in”中查找双精度型]