Search code examples
javaswingactionlistenerjtextfield

Making a JButton that switches text from 2 JTextFields on click with mouse

I have made a window using JFrame and on my JPanel I have added 3 components: 2 JTextFields ("field1" and "field2") and inbetween them a JButton ("switch"). My goal is to switch the value of field1 to field2 and vice versa when the JButton is clicked. I thought this ActionListener which I have added to my JButton would achieve my goal: 

    public void actionPerformed(ActionEvent e) {  
        field2.setText(field1.getText());  

        field1.setText(field2.getText());  
    }

However, it changes the value of field2 into the value of field1 but not the other way around.

Any help would be appreciated.

Solution

  • You need a temporarily variable todo. If you do not use on, you set the text from field1 to field2 and then you get the wrong value.

    public void actionPerformed(ActionEvent e) {  
        String tmp= field2.getText()  
        field2.setText(field1.getText());  

        field1.setText(tmp);  
    }