Java - Accessing component information

Question

So I have this class:

public class setting{
    JLabel label;
    Component main;
    JButton set, reset;

    setting(String s, Component b){
        this.label = new JLabel(s);
        this.main = b;
        this.set = new JButton("Set");
        this.reset = new JButton("Reset");
    }

    public void add(JPanel b) {
        b.add(this.label);
        b.add(this.main);
        b.add(this.set);
        b.add(this.reset);
    }
}

How would I be able to access this.main 's information? For example:

JSlider speed = new JSlider(0, 80); speed.setValue(0);
setting speedSett = new setting("speed", speed);
speedSett.main.getValue(); //This doesn't work

Is there anyway to access the information inside of the setting class the way I have this setup? I would like this class to accept different types of components, so simply setting it to JSlider won't do it for me. Thank you in advance.

Mạnh Quyết Nguyễn · Accepted Answer · 2018-05-08 21:12:02Z

1

If you know it's JSlider, cast it and use it:

JSlider speed = new JSlider(0, 80); speed.setValue(0);
setting speedSett = new setting("speed", speed);
if (speeSett.getMain() instanceof JSlider) {
  JSlider slider = (JSlider) speedSett.getMain(); // Recommend to access from getter instead of direct access
  slider.getValue();
}

edited May 8, 2018 at 21:12

answered May 8, 2018 at 21:03

Mạnh Quyết Nguyễn

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Mạnh Quyết Nguyễn Over a year ago

Glad it helps you

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