JLabel is not working separately but if use setText than both working

I am working on guessing game.

In the ActionPerformed function, if the button is clicked, then add JLabel, but if I use JLabel, it is not working separately but if use setText than both working (JLabel+setText). I want to use Jlabel separately.

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;


public class guess_game1 extends JFrame implements ActionListener{
    private static final long serialVersionUID = 1L;

    JButton[] jbut = new JButton [5];
    JPanel jp1 = new JPanel();
    JPanel jp2 = new JPanel();
    JLabel jl = new JLabel("Cots!");
    JButton s;

    Random rand = new Random();




    public guess_game1(){

        for(int i=0; i<jbut.length ;i++){
            jbut[i] = new JButton("");  
            jbut[i].setPreferredSize(new Dimension(100,70));
            jp1.add(jbut[i]);
            jbut[i].addActionListener(this);
        }

        s = new JButton("Shuffle");
        s.addActionListener(this);
        jp2.add(s);
        add(jp1);

        add(jp2,BorderLayout.SOUTH);




        setSize(700,200);
        setLocationRelativeTo(null);
        setTitle("Awais's Game");
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);

    }

    public static void main(String[] args) {
        new guess_game1();
    }

    @Override
    public void actionPerformed(ActionEvent a) {
        JButton j = (JButton) a.getSource();

        if(a.getSource() == s){
            int ran = rand.nextInt(5);
            jbut[ran].add(jl);
//          jbut[ran].setText("Awais");

        }
    }