if else if statements

How do you use an if and else statement with a string? I'm trying to do this

Code:

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import javax.swing.JOptionPane;
import java.util.Scanner;

public class Tax_Calculations
{
        public static void main(String []args)
        {
                String status, income;
                double INCOME;
               
                Scanner keyboard = new Scanner(System.in);
                JOptionPane.showInputDialog("Please state your marital status. (SINGLE or MARRIED)");
                status = keyboard.nextLine();
               
                if (status == "SINGLE"){
               
                        JOptionPane.showInputDialog("What is your annual income?");
                        income = keyboard.nextLine();
                        INCOME = Double.parseDouble(income);
                       
                        JOptionPane.showMessageDialog(null, INCOME);
                        System.exit(0);
                        }
                else if (status == "MARRIED"){
                System.exit(0);
                }
                }
        }

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I ran it in debug mode and it displays the first dialog window but then it stops at status = keyboard.nextLine();. It doesn't continue to run the program after that. Help! Thank you!

Quote:

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Originally Posted by Allspark

How do you use an if and else statement with a string? I'm trying to do this

Code:

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                if (status == "SINGLE"){

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The only right way to do string comparison in java is with:

Code:

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if (status.equals("SINGLE"))

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Also you should add an ending else statement to catch the case where none of the above if tests were true.
Same idea as a default in a switch statement

Are you mixing command line input and Swing?
You have a JOptionPane prompting for input and yet seem to be taking your input from System.in...that doesn't sound right to me.

Thank you for saying that! That's why it doesn't read the input. I'm using System.in! Thanks

Ok so I looked for what input method to use and I can't find any that I am able to use! :( What input method should I use? I'm guessing that instead of importing java.util.Scanner I should import something else, but what?

Are you supposed to be using Swing?
If not I'd suggest simply doing this with a command prompt.
System.out.println() for your user prompts.
Scanner, using System.in, for reading the user input.

ok i got the input, now i need help with the if else statment. I'm trying to make this code work with these four statements in red but it doesn't compile. Why?

Code:

---


import javax.swing.JOptionPane;
import java.util.Scanner;

public class Tax_Calculations
{
        public static void main(String []args)
        {
                String status, income;
                double INCOME;
                               
                Scanner keyboard = new Scanner(System.in);
                status = JOptionPane.showInputDialog("Please state your marital status. (SINGLE or MARRIED)");
               
                if (status.equals("SINGLE"))
                {
                        income = JOptionPane.showInputDialog("What is your annual income?");
                        INCOME = Double.parseDouble(income);
[COLOR="Red"][COLOR="Red"]                        if (INCOME <= 28000.0){
                                double sin_taxes1;
                                sin_taxes1 = INCOME * .15;
                                JOptionPane.showMessageDialog(null, "With an income of " + INCOME + ", you owe " + sin_taxes1 + " of taxes.");

                        }
                        else if (INCOME < 60000.00);{
                                double sin_taxes2;
                                sin_taxes2 = ((INCOME - 28000) * .25) + (28000 * .15);
                                JOptionPane.showMessageDialog(null, "With an income of " + INCOME + ", you owe " + sin_taxes2 + " of taxes.");
                        }
                        if (INCOME > 60000.00);{
                                double sin_taxes3;
                                sin_taxes3 = ((INCOME - 60000.0) * .3) + ((60000.0 - 28000.0) * .25) + (28000 * .15);
                                JOptionPane.showMessageDialog(null, "With an income of " + INCOME + ", you owe " + sin_taxes3 + " of taxes.");
                        }
                        else if (INCOME > 120400.00){
                                double din_taxes4;
                                sin_taxes4 = ((INCOME-120400.0) * .35) + ((120400.0 - 60000) * .3) + ((60000 - 28000) * .25) + (28000 * .15);
                                JOptionPane.showMessageDialog(null, "With an income of " + INCOME + ", you owe " + sin_taxes4 + " of taxes.");[/COLOR][/COLOR]
                               
                       
                        System.exit(0);
                        }

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Quote:

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it doesn't compile. Why?

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Does the compiler give any error messages?
Please copy the full text and paste them here.

What is the exact error message you get? "doesn't compile" isn't a helpful statement.