Yahtzee code help

I have to create a code so we can play the game Yahtzee.
Here's the rules if you don't know them: Yahtzee - Wikipedia, the free encyclopedia

I have the basic layout already programmed with the dice rolling random numbers.
The user of the program needs to be able to "hold" numbers they don't want to get rid of. The user is rolling 5 dice and they need to be able to "hold" a die if they don't want a new number for that particular die. For example, if they roll three 5s, they should be able to click on each die and it shouldn't change, but they can roll the other two dice.
Then after they decide what they want to keep, I need a some kind of score card that decides if what they have is 3 of a kind, 4 of a kind, Yahtzee, a straight, etc.

How would I hold the numbers they want and how do I create a score card that determines if they have certain things (straight, Yahtzee, 3 of a kind...)

If you can point me in the direction of any online sites that would help me, please do! Thanks!

I don't know if it will help but here's my code so far. Everything works so I'm not looking for errors!

Code java:

package dice;
 
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
 
public class Yahtzee extends JFrame implements ActionListener
{
    //danny the dice
    D6 danny;
    D6 danny2;
    D6 danny3;
    D6 danny4;
    D6 danny5;
 
    JPanel leftSide; //will have control buttons on left
    JPanel rightSide; //will have the dice on the right (D6s)
    JButton rollAll; //roll all the dice
 
 
public static void main (String [] args)
    {
    Yahtzee game = new Yahtzee();
    }
public Yahtzee()
    {
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setLayout(new BorderLayout() );
 
    //adding the panel
    leftSide = new JPanel();
    //set background color to light blue
    leftSide.setBackground(new Color(200,200, 250));
    //saying what side the blue will be on
    add(leftSide,BorderLayout.WEST);
 
    //setting things up on the right side
    rightSide = new JPanel();
    rightSide.setBackground(Color.PINK);
    add(rightSide,BorderLayout.EAST);
 
    //the five dice for rolling
    danny = new D6();
    rightSide.add (danny);
 
    danny2 = new D6();
    rightSide.add (danny2);
 
    danny3 = new D6();
    rightSide.add (danny3);
 
    danny4 = new D6();
    rightSide.add (danny4);
 
    danny5 = new D6();
    rightSide.add (danny5);
 
    //rolls all the dice at once
    rollAll = new JButton("Roll All");
    leftSide.add(rollAll);
    rollAll.addActionListener(this);
 
    setSize (800,500);
    setVisible(true);
    } //end constructor
 
public void actionPerformed(ActionEvent e)
    {
    //will roll all of the dice so they all work
    danny.roll();
    danny2.roll();
    danny3.roll();
    danny4.roll();
    danny5.roll();
    repaint();
 
    }
 
}
 
 
Heres program D6
 
package dice;
 
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.*;
import javax.swing.JButton;
import javax.swing.JPanel;
 
 
public class D6 extends JPanel implements ActionListener
{
    int face; //the number of dots when it comes to rest
    JButton rollMe; //press this button to roll this D6
 
    //constructor
    public D6()
    {
        roll();
 
        rollMe = new JButton("Roll!");
        add (rollMe);
        rollMe.addActionListener(this);
 
        setBackground(Color.yellow);
        setPreferredSize ( new Dimension(100,100));
        setVisible(true);
    }
 
    //randomize the value of face
    public void roll()
    {
        face = (int)(Math.random()*6+1);
    }
 
    //This
    public void actionPerformed(ActionEvent e)
    {
        if (e.getSource()==rollMe){roll();}
        repaint();
    }
    //draws face number of dots
    @Override
    public void paint (Graphics g )
    {
        super.paint(g);
        g.drawString(""+face,50,50);
 
    }
 
 
}