Why won't this If statement work for the string?

Question

import java.util.Scanner;

public class Methods {

/*
 * Compound interest Program Quarterly
 */


    public static void main(String[] args) {
        Scanner keyboard = new Scanner  (System.in);

        System.out.println("What is the Rate");
        int rate = keyboard.nextInt()/100;
        System.out.println("What is the Amount");
        int amount = keyboard.nextInt();
        System.out.println("How many years?");
        int years = keyboard.nextInt();

        keyboard.nextLine();
        System.out.println("How is it compounded? Press Q = Quarterly, A = Anually, S = SemiAnnualy, M = Monthly");

        String answer = keyboard.nextLine();

       int easy = amount*(1+(rate/years));
       int pow = 4 * years;


        if (answer == "/Q"){
            System.out.println("Your answer compounded Quarterly is: "  + Math.pow(easy,pow));

This is the code, but the if statement with String == "Q" doesn't work because when I press Q nothing happens? what's the issue?

Yes I sadly did, but it still doesn't work despite the / I just added it after looking at a similar question — Winter One, Mar 30 '15 at 02:03
You clearly do not understand the difference between the `==` operator, which compares reference values (object addresses) and the `equals` or `equalsIgnoreCase` functions. — Hot Licks, Mar 30 '15 at 02:06

score 0 · Answer 1 · answered Mar 30 '15 at 02:03

0

Java right? use equalsIgnoreCase because you could be typing 'q' and that / they told you about too, keep it in mind

answered Mar 30 '15 at 02:03

gia

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I'm typing in the uppercase Q to test it, I can't even test it because it ignores the upppercase Q it's not the lower case – Winter One Mar 30 '15 at 02:05
try to debug using answer.lenght() and System.out.println("OOO"+answer+"OOO"), maybe java is adding the line feed to your answer and that's why it fails the check. regardless, still use equalsIgnoreCase so peopel can type both Q and q – gia Mar 30 '15 at 02:10

score 0 · Answer 2 · edited May 23 '17 at 11:57

0

First issue is that you have a typo (the forward slash) in this line:

if (answer == "/Q"){

The second issue is that you don't compare strings like this. Instead use the "equals()" method.

if(answer.equals("Q")){

See here for more information: How do I compare strings in Java?

edited May 23 '17 at 11:57

Community

1
1

answered Mar 30 '15 at 02:05

Aequitas

2,205
1
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score 0 · Answer 3 · answered Mar 30 '15 at 02:05

0

Maybe you can try

if(answer.equals("Q"))

answered Mar 30 '15 at 02:05

Kim Leo

1
3

Yeah this worked, but I still would like to understand why the prior one didn't work thanks for this though ill probably just switch to this – Winter One Mar 30 '15 at 02:07
@WinterOne **==** just do check for if these two object are exactly same one, and **equals** do the check if two string has came content. – Kim Leo Mar 30 '15 at 05:13

Why won't this If statement work for the string?

3 Answers3