How to print out the input or JTextFiled

Question

As a part of my program, I just want to print out what the user enters in the jTextField

here is what I do, but does not work at all.

JTextField myInput = new JTextField();
String word = myInput.getText();

myInput.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) 
{
System.out.print(word);
}

});

Any idea?

score 2 · Accepted Answer · answered Mar 28 '13 at 13:09

2

In the actionlistener you need to retrieve the value from the textfield.

 System.out.print(myInput.getText());

At the moment, you are getting a empty value because at the point where you call getText() there is nothing in the textfield because the user did not have time to type something.

answered Mar 28 '13 at 13:09

Vincent Ramdhanie

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Thank you for your answer but did not work: it give an error for myInput.getText(). here is the error: Cannot refer to a non-final variable myInput inside an inner class defined in a different method – Alex Jj Mar 28 '13 at 13:20
So you need to declare the textfield as a instance variable. That way you will have proper access to it from within the inner class. – Vincent Ramdhanie Mar 28 '13 at 13:24

score 1 · Answer 2 · answered Mar 28 '13 at 13:09

1

You aren't updating the text (word) in actionPerformed, so it's staying the same. Try:

myInput.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) 
{
System.out.print(myInput.getText());
}

Therefore, you don't even need to declare word at all.

answered Mar 28 '13 at 13:09

tckmn

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Thank you for your answer but did not work: it give an error for myInput.getText(). here is the error: Cannot refer to a non-final variable myInput inside an inner class defined in a different method – Alex Jj Mar 28 '13 at 13:19

tmwanik · Answer 3 · 2013-03-28T13:25:22.820

1

final JTextField myInput = new JTextField();

myInput.addActionListener(new ActionListener(){
    public void actionPerformed(ActionEvent e) {
        System.out.print(myInput.getText());
    }
});

Calling myInput.getText() outside the actionListener will assign empty string to word.

edited Mar 28 '13 at 13:25

answered Mar 28 '13 at 13:10

tmwanik

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Thanks for reply. When I move the second line inside the action listener it gives the same error as system.out.print(myInput.getText); does which the error is: Cannot refer to a non-final variable myInput inside an inner class defined in a different method – Alex Jj Mar 28 '13 at 13:22

score 1 · Answer 4 · answered Mar 28 '13 at 13:11

1

take the 2nd line inside the action performed method

answered Mar 28 '13 at 13:11

Moayad Al-sowayegh

87
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I don't see why you want to set it as Final, I think it may cause trouble if u wanna change the value of it after you set it for the 1st time – Moayad Al-sowayegh Mar 28 '13 at 14:36

score 0 · Answer 5 · answered Mar 28 '13 at 13:29

0

Thank you everyone for your answers. In fact you are all right and I just need to delcare the variable as final. I still do not know why I should add that but it's working now. I hope that 'final' doesn't make make any problem later.

answered Mar 28 '13 at 13:29

Alex Jj

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How to print out the input or JTextFiled

5 Answers5