import java.awt.Dimension; import java.awt.HeadlessException; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.File; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import javax.swing.JFileChooser; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swin
![Java @ mock - テキストエディタソースver1.0](https://cdn-ak-scissors.b.st-hatena.com/image/square/45c4684c76601e94abbe94966d9d5a26153b8fbd/height=288;version=1;width=512/https%3A%2F%2Fimg.atwiki.jp%2F_img%2Fog_image.png)