I'm trying to make a loop

Question

import javax.swing.JOptionPane;
public class New {
    public static void main (String[] args) { 
        String name = JOptionPane.showInputDialog("Enter your name... ");
        do{JOptionPane.showInputDialog( "YOUR NAME...");}
        while(name.equals(""));

        JOptionPane.showMessageDialog(null, "Hello and welcome!, "+name);

        int age = Integer.parseInt(JOptionPane.showInputDialog("Enter your age... "));
        if(age>=60) { JOptionPane.showMessageDialog(null, "Ok Boomer!");
        System.exit(0);}
        else if(age>=18) { JOptionPane.showMessageDialog(null, "You are an adult, Welcome!");
        }
        else { JOptionPane.showMessageDialog(null, "You are a kid!");
        System.exit(0);}

        String day = JOptionPane.showInputDialog("What's the day? ");

        if(day.equals("Monday")) { JOptionPane.showMessageDialog(null, "Welcome to Java club!");
        }
        else {JOptionPane.showMessageDialog(null, "Try again later!");
        }
        
    }
}

I want my loop to start when no name is entered and ends when there is a name, it keeps me in loop even when I enter a name (I'm a beginner)

Answer 1

I think you forgot to set the name variable in the do while loop. Try this:

import javax.swing.JOptionPane;
public class New {
    public static void main (String[] args) { 
        String name = JOptionPane.showInputDialog("Enter your name... ");
        while(name.equals("")){
             name=JOptionPane.showInputDialog( "YOUR NAME...");
        }
        

        JOptionPane.showMessageDialog(null, "Hello and welcome!, "+name);

        int age = Integer.parseInt(JOptionPane.showInputDialog("Enter your age... "));
        if(age>=60) { JOptionPane.showMessageDialog(null, "Ok Boomer!");
        System.exit(0);}
        else if(age>=18) { JOptionPane.showMessageDialog(null, "You are an adult, Welcome!");
        }
        else { JOptionPane.showMessageDialog(null, "You are a kid!");
        System.exit(0);}

        String day = JOptionPane.showInputDialog("What's the day? ");

        if(day.equals("Monday")) { JOptionPane.showMessageDialog(null, "Welcome to Java club!");
        }
        else {JOptionPane.showMessageDialog(null, "Try again later!");
        }
        
    }
}

Answer 2

You don't update name in your loop.
Instead of:

String name = JOptionPane.showInputDialog("Enter your name... ");
        do{JOptionPane.showInputDialog( "YOUR NAME...");}
        while(name.equals(""));

do:

String name;
        do{
              name = JOptionPane.showInputDialog("Enter your name... ");
        while(name.equals(""));