importing into project from java source file (Trying to set up imports into class file for compiling(java.util.Scanner. and java.Lang.Thread))

Question

im trying to get my calculator to work on CMD but how do i Get it to work on CMD but i already have put imports and the use within the code. so how do i get it to work on cmd.

heres the code

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.");

        }
    {
}

}

heres the error on cmd

Exception in thread "main" java.lang.NoClassDefFoundError: workspace\Calculator\ bin\Calculator (wrong name: Calculator) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$100(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

Answer 1

You should use Eclipse to compile and export the jar file. Then open it in cmd with: java -jar "YourJarFile.jar" To open cmd in the current directory where your jar file is in, use Shift + Right Click Then select Open Command Window Here

And you don't need to make a new Scanner object each time, you can use it again.

Answer 2

Let say Calculator class is located at path c:\\workspace

Open the CMD

c:\workspace> javac Calculator.java // Check .class file created at this location

c:\workspace> java Calculator