Java:扫描仪 float 错误

Question

我试图在 float 组中引入一组 float 字:

protected float[] a = new float [100];

public void setCoef(){

    System.out.println("Introduceti coeficientii: ");
    for (int i = 0; i <= this.grad; i++)
    {
        Scanner in = new Scanner(System.in);
        this.a[i] = in.nextFloat();
    }

}

但是当我输入 2.3 时，它会生成此异常:

Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:909)
at java.util.Scanner.next(Scanner.java:1530)
at java.util.Scanner.nextFloat(Scanner.java:2388)
at polinom.PolinomR.setCoef(PolinomR.java:35)
at polinom.PolinomReal.grade_coef(PolinomReal.java:14)
at polinom.Operatii.main(Operatii.java:43)

Answer 1

InputMismatchException :

Thrown by a Scanner to indicate that the token retrieved does not match the pattern for the expected type, or that the token is out of range for the expected type.

您收到此异常是因为您尝试插入错误的值。

确保您插入的是 2.3，而不是 2,3 或数字以外的其他内容。

如果您输入2.3，您的程序应该可以正常运行