Question

I am dynamically generating a list of name boxes, sliders and labels, and am trying to figure out how to access the values of the sliders and change the labels. Other posts suggest using an array, but I have no idea where to begin with that.

My code is as such:

public Tailoring(int n) {
    /*initComponents();*/
    JPanel containerPanel = new JPanel();
    containerPanel.setLayout(new BoxLayout(containerPanel, BoxLayout.PAGE_AXIS));
    this.add(containerPanel);
    JLabel Title = new JLabel("Tailoring:");
    containerPanel.add(Title);
    for(int i = 0; i < n; i++){
        JPanel rowPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
        JTextField NameBox = new JTextField("Guest " + (i+1));
        JSlider TipSlider = new JSlider();
        JLabel TipCost = new JLabel();
        rowPanel.add(NameBox);
        rowPanel.add(TipSlider);
        rowPanel.add(TipCost);
        containerPanel.add(rowPanel);
    }
}

Answer 1

You can create a new class YourPanel which extends JPanel.
Instead of the statement

JPanel rowPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));

you can use

YourPanel rowPanel = new YourPanel(new FlowLayout(FlowLayout.LEFT));

Define textfield, slider and label as the properties of this YourPanel class.
Provide getters/setters for each field. Then use an array or ArrayList of YourPanel objects in your application. You will be able to reach the n^th panel’s label with a call like:

panels.get(n).getJLabel();