I am making a network application that has a chat function. On the chat  I have one JTextPane
for displaying messages and one more for input. Then I have some buttons that allow to add style on the input text(bold,italic,font size,colour). The text is formatted correctly on input pane , although when moved to the display pane(once the correct JButton is pressed) it only has the format of last character. How can I move the text while keeping its original format?For example if I write "Hello Worl d" on the input , display shows "Hello Worl d"
textPane is the input pane
Where set :
final SimpleAttributeSet set = new SimpleAttributeSet();
Code for making input text bold(same of adding other styles) :
bold.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                StyledDocument doc = textPane.getStyledDocument();
                if (StyleConstants.isBold(set)) {
                    StyleConstants.setBold(set, false);
                    bold.setSelected(false);
                } else {
                    StyleConstants.setBold(set, true);
                    bold.setSelected(true);
                }
                textPane.setCharacterAttributes(set, true);
            }
        });
code for moving text from the input pane to the display pane :
getInput.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String input = textPane.getText();
                textPane.setText("");
                if(!input.endsWith("\n")){
                    input+="\n";
                }
                StyledDocument doc = displayPane.getStyledDocument();
                int offset = displayPane.getCaretPosition();
                try {
                    doc.insertString(offset, input, set);
                } catch (BadLocationException ex) {
                    Logger.getLogger(ChatComponent.class.getName()).log(Level.SEVERE, null, ex);
                }
            }
        });