从Java源文件导入项目（尝试设置导入到类文件以进行编译（java.util.Scanner.和java.lang.Thread））

Question

我试图让我的计算器在CMD上工作，但我如何让它在CMD上工作，但我已经把导入和使用在代码中。那么我如何让它在CMD上工作。

这是密码

import java.util.Scanner;
import java.lang.Thread;

public class Calculator {

    int B1;
int C1;
int D1;

@SuppressWarnings("resource")
public static void main(String[] args) throws Exception {
    System.out.println("How May i asist you with your calculation.");
    Thread.sleep(1000);
    System.out.println("So what opperation do you want to use. ");
    Scanner A1 = new Scanner(System.in);
    String in = A1.nextLine();
        if (in.equals("+")){
            System.out.println("Enter the first Number. ");
            Scanner Z = new Scanner(System.in);
            int B1 = Z.nextInt();
            System.out.println("Enter The last Number. ");
            Scanner Y = new Scanner(System.in);
            int C1 = Y.nextInt();
            int D1 = B1 + C1;
            System.out.println(" you answer is " + D1 + ".");}
        else if (in.equals("-")){
            System.out.println("Enter the first Number. ");
            Scanner Z = new Scanner(System.in);
            int B1 = Z.nextInt();
            System.out.println("Enter The last Number. ");
            Scanner Y = new Scanner(System.in);
            int C1 = Y.nextInt();
            int D1 = B1 - C1;
            System.out.println(" you answer is " + D1 + ".");}
        else if (in.equals("*")){
            System.out.println("Enter the first Number. ");
            Scanner Z = new Scanner(System.in);
            int B1 = Z.nextInt();
            System.out.println("Enter The last Number. ");
            Scanner Y = new Scanner(System.in);
            int C1 = Y.nextInt();
            int D1 = B1 * C1;
            System.out.println(" you answer is " + D1 + ".");}
        else if (in.equals("/")){
            System.out.println("Enter the first Number. ");
            Scanner Z = new Scanner(System.in);
            int B1 = Z.nextInt();
            System.out.println("Enter The last Number. ");
            Scanner Y = new Scanner(System.in);
            int C1 = Y.nextInt();
            int D1 = B1 / C1;
            System.out.println("You answer is " + D1 + ".");}
        else
            System.out.print("That's Not a valid operation.");

        }
    {
}

}

这是cmd上的错误

线程“main”java.lang.NoClassDeffounder中出现异常错误：workspace\Calculator\bin\Calculator（错误名称：

Answer 1

您应该使用Eclipse编译和导出jar文件。然后在cmd中用：Java-jar“yourjarfile.jar”打开它要在jar文件所在的当前目录中打开cmd，使用Shift+右键单击，然后在这里选择open Command Window

并且您不需要每次都制作一个新的扫描器对象，您可以再次使用它。