(支付宝30rmb)java简单记事本。有注释最好。
发布网友
发布时间：2022-04-25 03:28
共3个回答
热心网友
时间：2023-10-23 07:56
我有代码
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class MyNotepad implements ActionListener {
private JFrame frame = new JFrame("新记事本");
private JTextArea jta = new JTextArea();
private String result = "";
private boolean flag = true;
private File f;
private JButton jb = new JButton("开始");
private JTextField jtf = new JTextField(15);
private JTextField jt = new JTextField(15);
private JButton jbt = new JButton("替换为");
private JButton jba = new JButton("全部替换");
private Icon ic = new ImageIcon("D:\\java课堂笔记\\GUI\\11.gif");
private String value;
private int start = 0;
private JFrame jf = new JFrame("查找");
private JFrame jfc = new JFrame("替换");
@Override
public void actionPerformed(ActionEvent e) {
String comm = e.getActionCommand();
//新建命令要执行动作
if ("新建".equals(comm)) {
if (!(frame.getTitle().equals("新记事本"))) {
if (!flag) {
write();
newNew();
} else {
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null, "保存为");
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
flag = false;
write();
}
}
} else if (!(jta.getText().isEmpty())) {
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null, "保存为");
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
flag = false;
write();
newNew();
}
} else {
newNew();
}
} else if ("打开".equals(comm)) {//打开命令要执行动作
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
jfc.setDialogType(JFileChooser.OPEN_DIALOG);
int returnVal = jfc.showOpenDialog(null);
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
frame.setTitle(f.getName());
result = read();
flag = false;
value = result;
jta.setText(result);
}
} else if ("保存".equals(comm)) {//保存命令要执行动作
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
if (flag) {
int returnVal = jfc.showDialog(null, "保存为");
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
flag = false;
write();
}
} else {
write();
}
} else if ("另存".equals(comm)) {//另存命令要执行动作
JFileChooser jfc = new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null, "另存");
if (returnVal == JFileChooser.APPROVE_OPTION) {// 选择文件后再执行下面的语句，保证了程序的健壮性
f = jfc.getSelectedFile();
write();
}
} else if ("退出".equals(comm)) {
System.exit(0);
} else if ("撤销".equals(comm)) {
jta.setText(value);
} else if ("剪切".equals(comm)) {
value = jta.getText();
jta.cut();
} else if ("复制".equals(comm)) {
jta.copy();
} else if ("粘贴".equals(comm)) {
value = jta.getText();
jta.paste();
} else if ("删除".equals(comm)) {
value = jta.getText();
jta.replaceSelection(null);
} else if ("全选".equals(comm)) {
jta.selectAll();
} else if ("查找".equals(comm)) {
value = jta.getText();
jf.add(jtf, BorderLayout.CENTER);
jf.add(jb, BorderLayout.SOUTH);
jf.setLocation(300, 300);
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
} else if ("替换".equals(comm)) {
value = jta.getText();
GridLayout gl = new GridLayout(3, 3);
JLabel jl1 = new JLabel("查找内容:");
JLabel jl2 = new JLabel("替换为:");
jfc.setLayout(gl);
jfc.add(jl1);
jfc.add(jtf);
jfc.add(jb);
jfc.add(jl2);
jfc.add(jt);
jfc.add(jbt);
JLabel jl3 = new JLabel();
JLabel jl4 = new JLabel();
jfc.add(jl3);
jfc.add(jl4);
jfc.add(jba);
jfc.setLocation(300, 300);
jfc.pack();
jfc.setVisible(true);
jfc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
} else if ("版本".equals(comm)) {
JDialog jd = new JDialog(frame, "关于对话框");
jd.setSize(200, 200);
JLabel l = new JLabel("~~~~~~~~~~~~~~~你好~~~~~~~~~~~~~~~");
jd.add(l, BorderLayout.CENTER);
jd.setLocation(100, 200);
jd.setSize(300, 300);
jd.setVisible(true);
// jd.pack();
jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
} else if ("开始".equals(comm) || "下一个".equals(comm)) {
String temp = jtf.getText();
int s = value.indexOf(temp, start);
if (value.indexOf(temp, start) != -1) {
jta.setSelectionStart(s);
jta.setSelectionEnd(s + temp.length());
jta.setSelectedTextColor(Color.GREEN);
start = s + 1;
jb.setText("下一个");
// value=value.substring(s+temp.length());//不能截取字串
} else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
} else if ("替换为".equals(comm)) {
String temp = jtf.getText();
int s = value.indexOf(temp, start);
if (value.indexOf(temp, start) != -1) {
jta.setSelectionStart(s);
jta.setSelectionEnd(s + temp.length());
jta.setSelectedTextColor(Color.GREEN);
start = s + 1;
jta.replaceSelection(jt.getText());
} else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
} else if ("全部替换".equals(comm)) {
String temp = jta.getText();
temp = temp.replaceAll(jtf.getText(), jt.getText());
jta.setText(temp);
}
}
public String read() {
String temp = "";
try {
FileInputStream fis = new FileInputStream(f.getAbsolutePath());
byte[] b = new byte[1024];
while (true) {
int num = fis.read(b);
if (num == -1)
break;
temp = temp + new String(b, 0, num);
}
fis.close();
} catch (Exception e1) {
e1.printStackTrace();
}
return temp;
}
public void write() {
try {
FileOutputStream fos = new FileOutputStream(f);
fos.write(jta.getText().getBytes());
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void newNew() {
frame.dispose();
new MyNotepad();
flag = true;
}
public MyNotepad() {
JMenuBar jmb = new JMenuBar();
String[] menuLab = { "文件", "编辑", "帮助" };
String[][] menuItemLab = { { "新建", "打开", "保存", "另存", "退出" },
{ "撤销", "剪切", "复制", "粘贴", "删除", "全选", "查找", "替换" }, { "版本" } };
for (int i = 0; i < menuLab.length; i++) {
JMenu menu = new JMenu(menuLab[i]);
jmb.add(menu);
for (int j = 0; j < menuItemLab[i].length; j++) {
JMenuItem jmi = new JMenuItem(menuItemLab[i][j]);
menu.add(jmi);
jmi.addActionListener(this);
}
}
frame.setJMenuBar(jmb);
jta.setLineWrap(true);// 自动换行
JScrollPane jsp = new JScrollPane(jta);// 滚动窗口面板
frame.add(jsp);
jb.addActionListener(this);
jbt.addActionListener(this);
jba.addActionListener(this);
frame.setLocation(200, 50);
frame.setSize(620, 660);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new MyNotepad();
}
}
热心网友
时间：2023-10-23 07:56
用GUI吗？这个真的很简单的，建议你还是自己看看书吧
热心网友
时间：2023-10-23 07:57
直接去淘宝买啊！追问怎么买
追答去淘宝上搜课程设计之类的，然后进入问客服就行了
