how to extract two numbers from a string

[nathan gibson]

this is my code.

  import java.util.Scanner;
import java.util.Random;
public class CountingWithForLoops2
{
    public static void main(String [] args)
    {
        
        
        Scanner in;  
        
        in = new Scanner(System.in);
        
        System.out.println("Please enter your 3 numbers (e.g. 123)");
        String userNumber = in.next();
        int userInput = Integer.parseInt(userNumber);
        String firstNumbers = userNumber.substring(0, 1);
        String lastNumbers = userNumber.substring(1,2);
        int firstNumbersOfInput = Integer.parseInt(firstNumbers);
        int secondNumbersOfInput = Integer.parseInt(lastNumbers);
        
        
        
        
        int randomNumber = 0;
        Random randGen = new Random();
        randomNumber = randGen.nextInt(999) + 100;
        String stringRandomNumber = Integer.toString(randomNumber);
        String firstNumbersOfRandomString = stringRandomNumber.substring(0,1);
        String lastNumbersOfRandomString = stringRandomNumber.substring(1,2);
        int on_off = 0;
        int firstNumbersOfRandom = Integer.parseInt(firstNumbersOfRandomString);
        int secondNumbersOfRandom = Integer.parseInt(lastNumbersOfRandomString);
        
        boolean isOn = on_off == 1;
        boolean isOff = on_off == 0;
        
        int counter = 1;
        
        
        
        
            
           
                
            
        System.out.println("userNumber" + userNumber);
        System.out.println("userInput" + userInput);
        System.out.println("firstNumbers" + firstNumbers);
        System.out.println("lastNumbers" + lastNumbers);
        System.out.println("firstNumberOfInput" + firstNumbersOfInput);
        System.out.println("secondNumbersOfInput" + secondNumbersOfInput);
        System.out.println("\n");
        System.out.println("randomNumber" + randomNumber);
        System.out.println("stringRandomNumber" + stringRandomNumber);
        System.out.println("firstNumbersOfRandomString" + firstNumbersOfRandomString);
        System.out.println("lastNumbersOfRandomString" + lastNumbersOfRandomString);
        System.out.println("firstNumbersOfRandom" + firstNumbersOfRandom);
        System.out.println("secondNumbersOfRandom" + secondNumbersOfRandom);
    }
}

              

this is my output

Please enter your 3 numbers (e.g. 123)
234
userNumber234
userInput234
firstNumbers2
lastNumbers3
firstNumberOfInput2
secondNumbersOfInput3


randomNumber802
stringRandomNumber802
firstNumbersOfRandomString8
lastNumbersOfRandomString0
firstNumbersOfRandom8
secondNumbersOfRandom0

how can i make the strings "First Numbers" and "Last Numbers" retain the value of of the 0,1 1,2 values of the input and random?

[Henry Wong]

how can i make the strings "First Numbers" and "Last Numbers" retain the value of of the 0,1 1,2 values of the input and random?

substring (0,1) will only fetch you the first character. And substring (1,2) will only fetch you the second character. Is this what you want?

Henry

[nathan gibson]

no i want this:
789
first = 78
last = 89

[Henry Wong]

nathan gibson wrote:no i want this:
789
first = 78
last = 89

The substring indexes are inclusive for the start, and exclusive for the end -- so you want substring(0,2) and substring(1,3).

Henry

[nathan gibson]

thank you very much