[java swing]コンピテンシー値再抽出機能の作成

1.ボタンに関連する2つのクラス

import java.util.Random;

import javax.swing.JButton;

public class RandomButton extends JButton{
	
	static String[] stat_labels = {"힘","민첩","지능","행운","공격력"};
	static int[] max_stats = {7,7,7,7,3};
	
	
	Random ran;
	
	public RandomButton() {
		super("능력치 부여하기");
		ran = new Random();
	}
	
	void roll() {
		
		int value = ran.nextInt(stat_labels.length);
		setText(stat_labels[value] + " + " + (int)(Math.random()*(max_stats[value]) + 1));
		
		
	}
}

public class RollButton extends JButton{
	
	private ArrayList<RandomButton> ranBtns;

	public RollButton() {
		
		setText("옵션 변경");
		ranBtns = new ArrayList<>();
		RandomButton b1 = new RandomButton();
		b1.setLocation(175,40);
		b1.setSize(150,30);
		RandomButton b2 = new RandomButton();
		b2.setLocation(175,90);
		b2.setSize(150,30);
		RandomButton b3 = new RandomButton();
		b3.setLocation(175,140);
		b3.setSize(150,30);
		b1.setBackground(new Color(0x8a5700));
		b2.setBackground(new Color(0x8a5700));
		b3.setBackground(new Color(0x8a5700));
		b1.setForeground(new Color(0xfffef5));
		b2.setForeground(new Color(0xfffef5));
		b3.setForeground(new Color(0xfffef5));
		b1.setFont(new Font("고딕",Font.BOLD,16));
		b2.setFont(new Font("고딕",Font.BOLD,16));
		b3.setFont(new Font("고딕",Font.BOLD,16));

		ranBtns.add(b1);
		ranBtns.add(b2);
		ranBtns.add(b3);
		
		addActionListener(new ActionListener() {
			
			@Override
			public void actionPerformed(ActionEvent e) {
				
				for(RandomButton btn : ranBtns) {
					btn.roll();
				}
				
			}//actionPerformed
		});
	}

	public ArrayList<RandomButton> getRanBtns() {
		return ranBtns;
	}
	
}

2.主クラス

public class Baram extends JFrame{
	
	private ArrayList<RandomButton> ranBtns;
	
	Random ran;
	
	public Baram() {
		super("바람의 나라:연");
		setLayout(null);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setLocation(2000,100);
		setSize(500,400);
		setVisible(true);
		getContentPane().setBackground(new Color(0x041e47));
		ranBtns = new ArrayList<>();
		
		RollButton btn = new RollButton();
		btn.setLocation(170,230);
		btn.setBackground(new Color(0xde9631));
		btn.setForeground(new Color(0xfffef5));
		btn.setFont(new Font("고딕",Font.BOLD,20));
		btn.setSize(160,60);

		Border border = new LineBorder(Color.black,2);
		btn.setBorder(border);
		add(btn);
		
		for(RandomButton ranbtn : btn.getRanBtns()){
			add(ranbtn);
		}
		
	}
	
	
	public static void main(String[] args) {
	
		new Baram();
	}
	
}