データ管理アプリ

ごくごく簡単なデータ保存アプリです。
 データはカレントディレクトリにsystem.dataファイルに保存します。
 整合性チェックや入力チェックなどが入っていないので
 利用時は注意してください！（今後改善してきます！笑）

メインクラス 
package application;

import javax.swing.JFrame;

public class MainFrame {
	private JFrame frame;
	private MenuPanel menuPanel;
	
	public MainFrame() {
		this.frame = new JFrame();
		this.menuPanel = new MenuPanel();
		
		this.frame.setTitle("データ管理");
		this.frame.setBounds(100, 100, 300, 300);
		this.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
		this.frame.getContentPane().setLayout(null);
		this.frame.getContentPane().add(menuPanel, null);
		
		this.frame.setVisible(true);
	}
	
	public static void main(String args[]) {
		new MainFrame();
	}
}
トップ画面クラス 
package application;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.io.UnsupportedEncodingException;

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class MenuPanel extends JPanel implements ActionListener {
	public MenuPanel() {
		this.setBounds(0, 0, 300, 300);
		this.setLayout(null);
		
		JButton addBtn = new JButton("追加");
		addBtn.setBounds(5, 5, 120, 25);
		addBtn.addActionListener(this);
		
		JButton viewBtn = new JButton("表示");
		viewBtn.setBounds(130, 5, 120, 25);
		viewBtn.addActionListener(this);
		
		this.add(addBtn);
		this.add(viewBtn);
	}

	public void actionPerformed(ActionEvent e) {
		if(e.getActionCommand() == "追加") {
			System.out.println("追加クリック");
			new AddDataPage();
		}else if(e.getActionCommand() == "表示") {
			System.out.println("表示クリック");
			JScrollPane scroll = new JScrollPane(this.viewList());
			scroll.setBounds(5, 35, 280, 230);

			this.add(scroll);
			this.repaint();
		}
	}
	
	private JTable viewList() {
		String colName[] = {"No", "日付", "データ"};
		String viewData[][] = new String[31][3];
		
		try {
			FileReader file = new FileReader("system.data");
			BufferedReader br = new BufferedReader(file);
			
			String tmp;
			int i = 0;
			while((tmp = br.readLine()) != null) {
				String td[] = tmp.split(",");
				System.out.println("td[0]=" + td[0] + ",td[1]=" + td[1]);
				viewData[i] = new String[]{String.valueOf(i + 1), td[0], td[1]};
				i++;
			}
			
			br.close();
			file.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		JTable tableList = new JTable(viewData, colName);
		
		return tableList;
	}
}
データ追加クラス 
package application;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

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

public class AddDataPage extends JFrame implements ActionListener {
	private JPanel panel;
	private JTextField dateField;
	private JTextField dataField;
	
	public AddDataPage() {
		this.setTitle("追加");
		this.setBounds(100, 100, 300, 200);
		this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
		this.setLayout(null);
		this.getContentPane().add(viewAddPanel());
		this.setVisible(true);
	}
	
	private JPanel viewAddPanel() {
		this.panel = new JPanel();
		this.panel.setLayout(null);
		this.panel.setBounds(0, 0, 300, 200);
		
		JLabel titleLabel = new JLabel("データ登録");
		titleLabel.setBounds(5, 5, 200, 30);
		JLabel dateLabel = new JLabel("日付");
		dateLabel.setBounds(5, 35, 100, 25);
		JLabel dataLabel = new JLabel("データ");
		dataLabel.setBounds(5, 65, 100, 25);
		
		this.dateField = new JTextField();
		this.dateField.setBounds(115, 35, 150, 25);
		this.dataField = new JTextField();
		this.dataField.setBounds(115, 65, 150, 25);
		
		JButton registBtn = new JButton("登録");
		registBtn.setBounds(190, 105, 75, 25);
		registBtn.addActionListener(this);
		
		this.panel.add(titleLabel);
		this.panel.add(dateLabel);
		this.panel.add(dataLabel);
		this.panel.add(this.dateField);
		this.panel.add(this.dataField);
		this.panel.add(registBtn);
		
		return this.panel;
	}

	public void actionPerformed(ActionEvent ae) {
		if(ae.getActionCommand() == "登録") {
			System.out.println("登録クリック");
			
			try {
				File file = new File("system.data");
				FileWriter fw = new FileWriter(file, true);
				
				System.out.println("日付=" + this.dateField.getText() + ",データ=" + this.dataField.getText());
				fw.write(this.dateField.getText() + "," + this.dataField.getText() + "\n");
				
				fw.close();
				this.setVisible(false);
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}