记事本部分功能实现：
代码：
package zy123;
public class Text {
public static void main(String[] args) {
new TextPad();
}
}
package zy123;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream ;
import javax.swing.*;
public class TextPad implements ActionListener{
JFrame frame;
JMenuBar bar;
JMenu fileMenu,editMenu;
JMenuItem newItem, openItem, saveItem, saveasItem, closeItem;
ImageIcon newIcon, openIcon, saveIcon, saveasIcon, closeIcon;
JScrollPane scroll;
JTextArea area;
JFileChooser chooser;
File file;
public TextPad() {
frame = new JFrame("记事本");
bar = new JMenuBar();
fileMenu = new JMenu("文件");
editMenu = new JMenu("编辑");
newIcon = new ImageIcon("d:" + File.separator + "Textpad" + File.separator + "1.jpg");
openIcon = new ImageIcon("d:" + File.separator + "Textpad" + File.separator + "2.jpg");
saveIcon = new ImageIcon("d:" + File.separator + "Textpad" + File.separator + "3.jpg");
saveasIcon = new ImageIcon("d:" + File.separator + "Textpad" + File.separator + "4.jpg");
closeIcon = new ImageIcon("d:" + File.separator + "Textpad" + File.separator + "5.jpg");
newItem = new JMenuItem("新建(N)", newIcon);
openItem = new JMenuItem("打开(O)", openIcon);
saveItem = new JMenuItem("保存(S)", saveIcon);
saveasItem = new JMenuItem("另存为(A)", saveasIcon);
closeItem = new JMenuItem("退出(x)",closeIcon);
area=new JTextArea();
scroll=new JScrollPane(area);
newItem.setMnemonic(KeyEvent.VK_N);
openItem.setMnemonic(KeyEvent.VK_O);
saveItem.setMnemonic(KeyEvent.VK_S);
saveasItem.setMnemonic(KeyEvent.VK_A);
closeItem.setMnemonic(KeyEvent.VK_X);
newItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_DOWN_MASK));
openItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, InputEvent.CTRL_DOWN_MASK));
saveItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_DOWN_MASK));
saveasItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A, InputEvent.CTRL_DOWN_MASK));
closeItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X, InputEvent.CTRL_DOWN_MASK));
fileMenu.add(newItem);
fileMenu.add(openItem);
fileMenu.add(saveItem);
fileMenu.add(saveasItem);
fileMenu.addSeparator();
fileMenu.add(closeItem);
newItem.addActionListener(this);
openItem.addActionListener(this);
saveItem.addActionListener(this);
saveasItem.addActionListener(this);
closeItem.addActionListener(this);
bar.add(fileMenu);
bar.add(editMenu);
frame.setJMenuBar(bar);
frame.add(scroll);
frame.setSize(600, 400);
frame.setVisible(true);
}
public void actionPerformed(ActionEvent event) {
Object obj=event.getSource();
if(obj instanceof JMenuItem) {
JMenuItem item=(JMenuItem) obj;
if(item==newItem) {
new TextPad();
}else if(item==openItem) {
chooser=new JFileChooser();
chooser.showOpenDialog(null);
file=chooser.getSelectedFile();
try {
FileInputStream fis =new FileInputStream(file);
byte[]b = new byte[fis.available()];
fis.read(b);
area.append(new String(b));
fis.close();
}catch(FileNotFoundException e) {
e.printStackTrace();
}catch(IOException e) {
e.printStackTrace();
}
}else if(item == saveItem) {
if(file!=null) {
try {
PrintStream out = new PrintStream(new FileOutputStream(file));
out.print(this.area.getText());
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
}else if(item == saveasItem) {
chooser.showSaveDialog(null);
file = chooser.getSelectedFile();
if(!file.exists()) {
try {
if(!file.exists()) {
file.createNewFile();
}
FileOutputStream fos=new FileOutputStream(file);
byte[] b = area.getText().getBytes();
fos.write(b);
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}else if(item == closeItem) {
System.exit(1);
}
}
}
}
运行图：
按照老师上课的讲解以及代码照着写的 相当于自己重新复习了一遍 也更有了理解
本周课程总结：
事件处理监听处理
菜单组件JMenu JMenuBar JMenuItem
图型界面内容大致就快已经结束了 又学到很多新的知识和语法用法