Question

I’m doing a simple program regarding methods.
But I have one problem. Everything is already working except when looping.
When I choose to loop again. The program skips on inputting the name. And proceeds directly to the year and section.
Here’s the code:

public static void main(String[] args) {
do{
    System.out.println("Input info:");
        name=stringGetter("Name: ");
        yearandsec=stringGetter("Year and section: ");
        sex_code=charGetter("Sex code: " + "\n"  + "[M]" + "\n" + "[F]:");
        scode=intGetter("Scholarship code: ");
        ccode=intGetter("Course code: ");
        units=intGetter("Units: ");

        fee_per_unit=doubleGetter("Fee per unit: ");
        misc=doubleGetter("Miscellaneous: ");
        display();
         switches(scode, units, fee_per_unit, misc);
System.out.println("Another?");
dec=rew.nextInt();
}while(dec==1);




    }

Here’s the method getting the value for name together with the year and section:

public static String stringGetter(String ny){
       String sget;
        System.out.println(ny);
       sget=rew.nextLine();
       return sget;

    }

I’m really annoyed with this problem, and I don’t have any idea on how to fix this. Please help. thanks

Answer 1

Here is a simpler and more complete program that reproduces the error:

public static Scanner rew = new Scanner(System.in);

public static void main(String[] args) {
    int dec;
    do {
        System.out.println("Input info:");
        String name=stringGetter("Name: ");
        String yearandsec=stringGetter("Year and section: ");
        dec=rew.nextInt();
    } while(dec==1);
}

public static String stringGetter(String ny){
    System.out.println(ny);
    return rew.nextLine();
}

The problem is that after calling nextInt() the call to nextLine() reads up to the new line after the int (giving a blank line), not up to the next new line.

If you change dec to a String and change dec=rew.nextInt(); to dec=rew.nextLine(); then it will work fine. Here is a complete example that you can copy and paste into a blank file to see that it works correctly:

import java.util.*;

public class Program
{
    public static Scanner rew = new Scanner(System.in);

    public static void main(String[] args) {
        String dec;
        do {
            System.out.println("Input info:");
            String name = stringGetter("Name: ");
            String yearandsec = stringGetter("Year and section: ");
            dec = stringGetter("Enter 1 to continue: ");
        } while(dec.equals("1"));
    }

    public static String stringGetter(String ny){
        System.out.println(ny);
        return rew.nextLine();
    }
}

You may also want to consider adding proper parsing and validation to your program. Currently your program will behave in an undesirable way if the user enters invalid data.