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我有这个程序代码。如果用户以字符串格式输入输入，例如“三”，我希望该程序显示错误消息并再次提示用户输入正确的输入，而无需重新运行程序。但是程序不再接受输入。

//Program to get radius form user & calculate area of circle.
import java.util.InputMismatchException;
import java.util.Scanner;

public class AreaOfCircle {
public static void main(String[] args) {
    final float PI=3.14f;
    double rad=0.0;
    Scanner input=new Scanner(System.in);
    while(true){
        try {
            System.out.println("Enter radius of circle: ");
            rad = input.nextDouble();
            break;
            } 
            catch (InputMismatchException e) {
                System.out.println("Please enter radius in proper  format");
            }
        }
    System.out.println("Area of circle is: "+(PI*rad*rad));
}

}

输出是这样的。

Enter radius of circle: 
Three
Please enter radius in proper  format
Enter radius of circle: 
Please enter radius in proper  format
Enter radius of circle: 
Please enter radius in proper  format
Enter radius of circle: 
Please enter radius in proper  format
(infitely...)
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1 回答 1

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错误的输入仍在扫描仪中。尝试input.nextLine()在你的 catch 子句中做一个。

于 2012-12-24T06:51:06.333 回答