Java Simple Command Line Calculator With Math Operators

In This Example We Are Trying To Create A Simple Calculator That Works With User Inputs In Command Line.Open Text File & Save As "CmdCalculator".Create The Class and Main Method Inside It.Import The Scanner Class.

Create A Scanner Object To Get The User Inputs.
Create Two Double Variables To Save Two Inputs.
Create Another Variable To Save The Answer.

import java.util.Scanner;

class CmdCalculator {
   public static void main(String args[]){
      Scanner MyScanner = new Scanner(System.in);
      double No1,No2,Answer;
     
   }
}

Now We Need Is Get The User Input and Do The Calculation and Print The Outputs.In The Command Prompt Use Scanner.nextDouble Method To Get The User Inputs as double Variable Rather Than Text..Complete The Coding.

import java.util.Scanner;

class CmdCalculator {
   public static void main(String args[]){
      Scanner MyScanner = new Scanner(System.in);
      double No1,No2,Answer;
     
      System.out.print("Enter The No1 : ");
      No1 = MyScanner.nextDouble();

      System.out.print("Enter The No2 : ");
      No2 = MyScanner.nextDouble();

      Answer = No1 + No2;
      System.out.println("Addition Is : ");
      System.out.print(Answer);

      Answer = No1 - No2;
      System.out.println("Subtraction Is : ");
      System.out.print(Answer);

      Answer = No1 / No2;
      System.out.println("Division Is : ");
      System.out.print(Answer);

      Answer = No1 * No2;
      System.out.println("Multiplication Is : ");
      System.out.print(Answer);
   }
}

Now Run The Program.It Will First Ask Two User Input As No1 and No2.You Will Get Following Outputs At The End.

Enter The No1 : 12
Enter The No2 : 4
Addition Is : 16
Subtraction Is : 8 
Division Is : 3 
Multiplication Is : 48

Java Getting User Inputs

In This Example We Are Trying To Get User Inputs and Print It.
Open Text File & Save As SayHello.Create The Class and Main Method Inside It.Inside The Method Print A Text Line Asking User To Input The Name.

class SayHello {
   public static void main(String args[]){
      System.out.print("Enter The Name : ");
   }
}

To Get The User Inputs We Need A Scanner Object.But By Default Scanner Class Is Not Available Us To Create A Scanner Object.You Need To Import The Scanner Class First.After That You Can Use The Scanner Class.Create A String Variable To Save The Name and Create A Scanner Object To Get The User Inputs. 

import java.util.Scanner;

class SayHello {
   public static void main(String args[]){
      Scanner MyScanner = new Scanner(System.in);
      String Name;
      System.out.print("Enter The Name : ");
   }
}

Now We Need Is Get The User Input and Print It Again In The Command Prompt.Use Scanner.in Method To Get The User Inputs.Complete The Coding.

import java.util.Scanner;

class SayHello {
   public static void main(String args[]){
      Scanner MyScanner = new Scanner(System.in);
      String Name;
      System.out.print("Enter The Name : ");
      Name = MyScanner.nextLine();
      System.out.print("Hello ");
      System.out.print(Name);
   }
}

Now Run The Program.It Will First Print "Enter The Name : " and Wait For User Input.Type The Name and Press Enter Button To See The Output.You Will Get Following Outputs At The End.

Enter The Name : Nifal
Hello Nifal