java应用小程序计算器

最新问答

• Loli心的怪蜀黎

  以前用JBuilder2006写的 记事本 应该可以帮你 记的类名一样要和文件名一样
  要给我加分哦
  import java.io.*;
  import java.util.Calendar;
  import java.awt.*;
  import java.awt.event.*;
  
  import javax.swing.*;
  public class NoteBook extends JFrame implements ActionListener,ItemListener,WindowListener,MouseListener{
  Container c = this.getContentPane();
  JMenuBar jmb = new JMenuBar();
  JColorChooser jcc = new JColorChooser();
  
  JMenu jm1 = new JMenu("文件(F)");
  JMenu jm2 = new JMenu("编辑(E)");
  JMenu jm3 = new JMenu("格式(O)");
  JMenu jm4 = new JMenu("查看(V)");
  JMenu jm5 = new JMenu("帮助(H)");
  
  JMenuItem jmi1 = new JMenuItem("新建(N)");
  JMenuItem jmi2 = new JMenuItem("打开(O)");
  JMenuItem jmi3 = new JMenuItem("保存(S)");
  JMenuItem jmi4 = new JMenuItem("退出(X)");
  
  JMenuItem jmi5 = new JMenuItem("撤消(U)");
  JMenuItem jmi6 = new JMenuItem("复制(C)");
  JMenuItem jmi7 = new JMenuItem("粘贴(P)");
  JMenuItem jmi8 = new JMenuItem("剪切(T)");
  JMenuItem jmi12 = new JMenuItem("日期和时间");
  
  JMenuItem jmi9 = new JMenuItem("字体(E)");
  JCheckBoxMenuItem jcbmi = new JCheckBoxMenuItem("自动换行(W)");
  
  JMenuItem jmi10 = new JMenuItem("删除(S)");
  
  JMenuItem jmi11 = new JMenuItem("背景颜色(H)");
  
  JTextArea jta = new JTextArea(15,15);
  
  JScrollPane jsp = new JScrollPane(jta);
  //PupolMenu pm = new Pupolmenu();
  
  NoteBook(){
  this.addWindowListener(this);
  c.setLayout(new BorderLayout());
  c.add(jmb,BorderLayout.NORTH);
  this.setTitle("新建 文本文档");
  jmb.add(jm1);
  jm1.setMnemonic('f');
  jm1.addActionListener(this);
  jmb.add(jm2);
  jm2.setMnemonic('e');
  jmb.add(jm3);
  jm3.setMnemonic('o');
  jmb.add(jm4);
  jm4.setMnemonic('v');
  jmb.add(jm5);
  jm5.setMnemonic('h');
  
  jm1.add(jmi1);
  jmi1.addActionListener(this);
  jmi1.setAccelerator(KeyStroke.getKeyStroke('N',Event.CTRL_MASK,false));
  jm1.addSeparator();
  jm1.add(jmi2);
  jmi2.setAccelerator(KeyStroke.getKeyStroke('O',Event.CTRL_MASK,false));
  jmi2.addActionListener(this);
  jm1.addSeparator();
  jm1.add(jmi3);
  jmi3.setAccelerator(KeyStroke.getKeyStroke('S',Event.CTRL_MASK,false));
  jmi3.addActionListener(this);
  jm1.addSeparator();
  jm1.add(jmi4);
  jmi1.setMnemonic('n');
  jmi2.setMnemonic('o');
  jmi3.setMnemonic('s');
  jmi4.setMnemonic('x');
  jmi4.addActionListener(this);
  
  jm2.add(jmi5);
  jm2.addSeparator();
  jm2.add(jmi6);
  jm2.addSeparator();
  jm2.add(jmi7);
  jm2.addSeparator();
  jm2.add(jmi8);
  jm2.add(jmi12);
  jmi12.addActionListener(this);
  
  jm3.add(jcbmi);
  jcbmi.addItemListener(this);
  jm3.addSeparator();
  jm3.add(jmi9);
  
  jm4.add(jmi10);
  jmi10.addActionListener(this);
  
  jm5.add(jmi11);
  jmi11.addActionListener(this);
  
  c.add(jsp);
  this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
  this.setSize(500,500);
  this.setVisible(true);
  
  }
  public void actionPerformed(ActionEvent e){
  if(e.getSource()==jmi1){
  jta.setText("");
  this.setTitle("无标题 - 记事本");
  }
  if(e.getSource()==jmi2){
  File f1;
  JFileChooser jfc1 = new JFileChooser();
  int num1 = jfc1.showOpenDialog(this);
  if(num1==JFileChooser.APPROVE_OPTION){
  try{
  f1 = jfc1.getSelectedFile();
  this.setTitle(f1.getName());
  FileReader fr = new FileReader(f1);
  BufferedReader br = new BufferedReader(fr);
  String str;
  while((str = br.readLine())!=null){
  jta.setText(str);
  }
  fr.close();
  br.close();
  }catch(FileNotFoundException e1){
  e1.printStackTrace();
  }catch(IOException e2){
  e2.printStackTrace();
  }
  }
  }
  if(e.getSource()==jmi3){
  File f2 = null;
  JFileChooser jfc2 = new JFileChooser();
  int num2 = jfc2.showSaveDialog(this);
  if(num2==JFileChooser.APPROVE_OPTION){
  f2=jfc2.getSelectedFile();
  this.setTitle(f2.getName());
  try{
  FileWriter fw = new FileWriter(f2);
  BufferedWriter bw = new BufferedWriter(fw);
  
  bw.write(jta.getText());
  bw.close();
  fw.close();
  }catch(IOException e2){
  e2.printStackTrace();
  }
  }
  
  }
  if(e.getSource()==jmi4){
  int a = JOptionPane.showConfirmDialog(this,"文件已被改变，是否要保存？","提示",JOptionPane.YES_NO_CANCEL_OPTION);
  if(a==1){
  this.dispose();
  }else if(a==0){
  File f2 = null;
  JFileChooser jfc2 = new JFileChooser();
  int num2 = jfc2.showSaveDialog(this);
  if(num2==JFileChooser.APPROVE_OPTION){
  f2=jfc2.getSelectedFile();
  this.setTitle(f2.getName());
  try{
  FileWriter fw = new FileWriter(f2);
  BufferedWriter bw = new BufferedWriter(fw);
  
  bw.write(jta.getText());
  bw.close();
  fw.close();
  }catch(IOException e2){
  e2.printStackTrace();
  }
  this.dispose();
  }
  
  }
  }
  if(e.getSource()==jmi12){
  Calendar c1 =Calendar.getInstance();
  int y = c1.get(Calendar.YEAR);
  int m = c1.get(Calendar.MONTH);
  int d = c1.get(Calendar.DATE);
  int h = c1.get(Calendar.HOUR);
  int m1 = c1.get(Calendar.MINUTE);
  int m2 = m+1;
  jta.setText(y+"年"+m2+"月"+d+"日"+h+":"+m1);
  }
  if(e.getSource()==jmi11){
  Color ccc = JColorChooser.showDialog(this,"color",Color.BLACK);
  jta.setSelectedTextColor(ccc);
  jta.setBackground(ccc);
  }
  if(e.getSource()==jmi10){
  jta.replaceRange("",jta.getSelectionStart(),jta.getSelectionEnd());
  }
  
  }
  public void itemStateChanged(ItemEvent e2){
  if(e2.getItemSelectable()==jcbmi){
  jta.setLineWrap(true);
  }else
  jta.setLineWrap(false);
  
  }
  public static void main(String[] args){
  new NoteBook();
  }
  public void windowOpened(WindowEvent arg0) {
  
  }
  public void windowClosing(WindowEvent arg0) {
  
  int a = JOptionPane.showConfirmDialog(this,"文件已被改变，是否要保存？","提示",JOptionPane.YES_NO_CANCEL_OPTION);
  if(a==1){
  this.dispose();
  }else if(a==0){
  File f2 = null;
  JFileChooser jfc2 = new JFileChooser();
  int num2 = jfc2.showSaveDialog(this);
  if(num2==JFileChooser.APPROVE_OPTION){
  f2=jfc2.getSelectedFile();
  this.setTitle(f2.getName());
  try{
  FileWriter fw = new FileWriter(f2);
  BufferedWriter bw = new BufferedWriter(fw);
  
  bw.write(jta.getText());
  bw.close();
  fw.close();
  }catch(IOException e2){
  e2.printStackTrace();
  }
  }
  if(a==2){
  ////????/????????????????????????????????????????????????????????????????//
  }
  }
  }
  public void windowClosed(WindowEvent arg0) {
  
  }
  public void windowIconified(WindowEvent arg0) {
  // TODO Auto-generated method stub
  
  }
  public void windowDeiconified(WindowEvent arg0) {
  // TODO Auto-generated method stub
  
  }
  public void windowActivated(WindowEvent arg0) {
  // TODO Auto-generated method stub
  
  }
  public void windowDeactivated(WindowEvent arg0) {
  // TODO Auto-generated method stub
  
  }
  public void mouseClicked(MouseEvent arg0) {
  // TODO Auto-generated method stub
  
  }
  public void mousePressed(MouseEvent arg0) {
  // TODO Auto-generated method stub
  
  }
  public void mouseReleased(MouseEvent arg0) {
  // TODO Auto-generated method stub
  
  }
  public void mouseEntered(MouseEvent arg0) {
  // TODO Auto-generated method stub
  
  }
  public void mouseExited(MouseEvent arg0) {
  // TODO Auto-generated method stub
  
  }
  }

  浏览 213赞 50时间 2023-08-05
• 无敌小雷神

  随便找一本学习java的书上都会有相应的例子的
  记得《java核心技术》卷1上就有现成的

  浏览 482赞 94时间 2023-06-15
• whahappy502

  百度

  浏览 450赞 133时间 2022-06-19