Convert int to String

Question

private JTextField resultTextField;
resultTextField.setText(" "); ...

private class InputListener implements ActionListener
{
    public void actionPerformed(ActionEvent e)
    {
        Stack<Integer> operandStack = new Stack<Integer>();
        Stack<Character> operatorStack = new Stack<Character>();

        String input = inputTextField.getText();

        StringTokenizer strToken = new StringTokenizer(input, " ", false);


        while (strToken.hasMoreTokens())
        {
            String i = strToken.nextToken();
            int operand;
            char operator;

            try
            {
                operand = Integer.parseInt(i);
                operandStack.push(operand);
            }
            catch (NumberFormatException nfe)
            {
                operator = i.charAt(0);
                operatorStack.push(operator);
            }
        }
        int result = sum (operandStack, operatorStack);
        resultTextField.setText(result);

The last line that reads: "resultTextField.setText(result);" in the code provided, I'm trying to convert the 'result' variable to a String but having no success. The compile error message I get is:

PrefixExpression.java:96: error: method setText in class JTextComponent cannot be applied to given types;
          resultTextField.setText(result);
                         ^
  required: String
  found: int
  reason: actual argument int cannot be converted to String by method invocation conversion.

I've tried several methods already provided in answers to other 'convert int to String' questions in here, but none of them work. How do I convert 'result' to a String? Thanks for your help.

Show us the methods that you tried and what the problem with them was. — RealSkeptic, Apr 12 '15 at 19:23

druidicwyrm · Accepted Answer · 2015-04-12T19:33:36.783

4

This will convert an int to a string:

resultTextField.setText(Integer.toString(result));

EDIT: As mentioned below there is no need to import java.lang as it will be available always.

edited Apr 12 '15 at 19:33

answered Apr 12 '15 at 19:28

druidicwyrm

480
2
11

2

You never need to import the `java.lang.*` library. – RealSkeptic Apr 12 '15 at 19:30
I'll edit my answer to remove the import. – druidicwyrm Apr 12 '15 at 19:32

MLavrentyev · Answer 2 · 2015-04-12T20:33:34.730

3

You can use the Integer.toString(number) or String.valueOf(number) function. This function can take an integer and turn it into a String. Try adding:

String numResult = Integer.toString(result);

or

String numResult = String.valueOf(result);

edited Apr 12 '15 at 20:33

answered Apr 12 '15 at 19:29

MLavrentyev

1,827
2
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Moishe Lipsker · Answer 3 · 2015-04-12T19:34:22.623

2

You could do a hack

resultTextField.setText(result + "");

edited Apr 12 '15 at 19:34

answered Apr 12 '15 at 19:26

Moishe Lipsker

2,974
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Moishe, thank you, it worked! YAHOOOOOOO! – Jeremy Apr 12 '15 at 19:32
Actually, @Jeremy, this is considered bad practice. – RealSkeptic Apr 12 '15 at 19:33
@RealSkeptic RealSkeptic, what is considered bad practice, the code that Moishe Lipsker provided or my comment to him or her? – Jeremy Apr 12 '15 at 19:44
@MoisheLipsker I just noticed the words, "You could do a hack." How Cool! My first time hacking! Okay :-( not cool. – Jeremy Apr 12 '15 at 19:47
1

@Jeremy I meant the code. See [this answer](http://stackoverflow.com/a/4105406/4125191) which explains this. – RealSkeptic Apr 12 '15 at 19:48
@RealSkeptic I read 'this answer' that you provided, makes sense. Thanks! – Jeremy Apr 12 '15 at 19:52
@RealSkeptic All of the answers I received worked, so why can't I give a green check mark to them all? – Jeremy Apr 12 '15 at 20:02
Only one answer can be marked as the correct answer you were looking for. However, all answers can be upvoted (multiple times) if they are on track and provide something useful. – Moishe Lipsker Apr 12 '15 at 20:08
@MoisheLipsker Thanks, Moishe, I upvoted them all! :-) – Jeremy Apr 12 '15 at 20:11

score 1 · Answer 4 · answered Apr 12 '15 at 19:23

1

Just do this: (new Integer(result)).toString() and you should be OK.

answered Apr 12 '15 at 19:23

peter.petrov

38,363
16
94
159

2

Wouldn't `Integer.toString(result)` be neater? – Boris the Spider Apr 12 '15 at 19:24
@BoristheSpider Yes, sure. – peter.petrov Apr 12 '15 at 19:24
Besides neater, it will create one less object. – RealSkeptic Apr 12 '15 at 19:48

Convert int to String

4 Answers4