How to use 2 variables as user input to count - JAVA

Question

I am pretty new to JAVA. I want to know how I can create a little program where the user can have the start and the end input (2 user inputs). And then count the in between numbers. Like this for example:

• User input 1 = 5; User input 2 = 10; The result should be: 5,6,7,8,9,10.

After some research I got this code but something is wrong, I really appreciate the help!

 import javax.swing.*;
 class Users{
    public static void main(String[] args) 
    {
        int a = userinput();
        int b = userinput();
        for( a = a <= b ; a = a + 1)
        {
            System.out.println(a);
        }
    }

public static int userinput()
{
    String tekst = JOptionPane.showInputDialog(null, "enter a number", "Users",3);
    int number = Integer.parseInt(tekst);
    return number;
}
}

Answer 1

You had a little error in your for loop.

Plus I'd use a special variable only for counting/iterating, in order not to mess up the input:

import javax.swing.JOptionPane;

class Users {
    public static void main(final String[] args) {
        final int a = userinput();
        final int b = userinput();
        for (int counter = a; counter <= b; counter++) {
            System.out.println(counter);
        }
    }

    public static int userinput() {
        final String tekst = JOptionPane.showInputDialog(null, "enter a number", "Users", 3);
        final int number = Integer.parseInt(tekst);
        return number;
    }
}

Also, if you wanna increase a value, you can to

a++;
++a;
a+=1;
a=a+1;

which are more or less the same.

Answer 2

(This is not gui based solution, it displays in console)

First I think you should learn scanner in java. you need to import scanner

import java.util.Scanner;

Then you need to create a scanner object inside your main method.

Scanner keyboard = new Scanner(System.in);

You can take input with this code:

System.out.println("Enter first number");
int firstInput=keyboard.nextInt();
System.out.println("Enter second number");
int secondInput=keyboard.nextInt();

After you have inputs you can make a for loop to count between

for(int i=firstInput;i<=secondInput;i++){
    System.out.print(i);
} 

I hope this helps your problem.

Answer 3

Use scanner instead of joption if you are new. import this in top of the line.

import java.util.*; 

Write below code in your function to take input

 Scanner sc= new Scanner(System.in);    //System.in is a standard input stream  
 System.out.print("Enter number- ");  
 int number= sc.nextInt();  

Answer 4

import scanner class at top.

import java.util.*; //here is a code to create new user defined variable.

Scanner sc= new Scanner(System.in);

// Create a Scanner object
System.out.println("Enter first variable");

int firstVariable= sc.nextInt();

System.out.println(" First Variable is: " + firstVariable); // Output user input

int secondVariable= sc.nextInt();

System.out.println(" Second Variable is: " + secondVariable); // Output user input