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java语言基础代码字典 java字典用法
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如何一步一步学习java 知乎
其实Java要学的技术非常多，比如Java编程，多线程，前端开发，Java框架等等，需要你一步一步由浅及深的学习，现在有Java基础部分，再来就是javaweb，还有Java框架的学习，学习时，不要着急，心态很重要，还有就是配合书籍视频等，多敲代码练习，最好是再学习些大数据的知识，对你以后找工作会有很大的帮助。
相关问答
Q1: JAVA代码中如何封装数据字典。
Map可以实现类似数据库的功能。比如一个人的姓名和年龄信息你可以存在一个Map里面，就像这样：
MapString, Integer map = new HashMapString, Integer();
map.put("张三", 40);
System.out.println("张三的年龄是：" + map.get("张三");
Q2: Java培训都学哪些知识?
Java培训一般会从以下四个方面着手。1、掌握Java语言的使用：语言语法、程序逻辑，OOP（面向对象）思想，封装、继承、多态，集合框架、泛型、File I\O技术，多线程技术、socket网络编程，XML技术。编程有关的操作系统基本使用，HTML5规范、HTML5文档结构、HTML5元素、Web语义化；CSS3规范、CSS3选择器、层叠与继承、盒模型与视觉格式化模型、现代CSS布局、CSS3基本属性千锋教育就有线上免费Java线上公开课。 2、掌握Java Web开发技术：Java开发中使用到的Web前端技术，HTML5+CSS3，JavaScript操作BOM和DOM，JQuery的选择器、事件处理、动画效果，MySQL数据库技术，JDBC技术、JSP、Servlet、EL和JSTL、过滤器和监听器、AJax异步请求等，Linux技术、SVN、Linux环境下项目发布部署等。3、掌握使用流行框架SSM\SSH技术实现企业级项目开发：重点学习MyBatis、Spring、Spring MVC框架的应用，Git、Java设计模式等，重点学习Struts2 、Spring、Hibernate框架的应用，Maven、Oracle数据库应用技术，了解大数据生态体系，Hadoop基础入门。4、JavaWeb框架：Spring体系结构、Spring IOC、AOP、FactoryBean与BeanFactory、声明性事务处理、Spring 5新特性。Maven与Gradle的使用。Spring Boot自动配置、Spring Boot CLI与Initializr、Spring Boot Starter、Actuator。SpringMVC工作原理和工作流程；拦截器、数据绑定转换和格式化、全局异常处理、转发与重定向、AJAX请求处理。如果想了解更多相关知识，建议到千锋教育了解一下。千锋教育总部位于北京，已在18个城市成立分公司，现有教研讲师团队300余人，每年培养泛IT人才近2万人，十年间累计培养超10余万泛IT人才 。
Q3: 我们老师有期末课程设计，关于Java源程序代码的英汉字典的，跪求您的帮忙我只有这么多的财富值，我可充话
package zyhz;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.sql.*;
import java.io.*;
import com.sun.media.sound.*;
public class Dictionary {
public Dictionary() {
}
public static void main(String[] args)
{
dicFrame frame = new dicFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
}
class dicFrame extends JFrame
{
public dicFrame()
{
setTitle("Dictionary");
setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);
panel = new JPanel();
add(panel);
//菜单栏
JMenu fileMenu = new JMenu("文件");
JMenuItem ECItem = new JMenuItem("英汉字典");
ECItem.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
text2.setText("请在上面输入英文！！！！");
}
});
JMenuItem CEItem = new JMenuItem("汉英字典");
CEItem.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
text2.setText("请在上面输入中文！！！！");
}
});
//备份词库
JMenuItem BackupItem = new JMenuItem("备份词库");
BackupItem.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException ce) {
System.out.println(ce);
}
url = "jdbc:odbc:test";
String fileName;
chooser = new JFileChooser();
frame = new JFrame();
chooser.setDialogTitle("备份词库为");
try {
flag = chooser.showSaveDialog(frame);
} catch (HeadlessException h) {
System.out.println("Save File Dialog ERROR!");
}
if (flag == JFileChooser.APPROVE_OPTION) {
f = chooser.getSelectedFile();
fileName = chooser.getName(f);
fileName = chooser.getSelectedFile().getPath();
try {
File saveFile = new File(fileName);
FileWriter fw = new FileWriter(saveFile);
try
{
con = DriverManager.getConnection(url);
s = con.createStatement();
rs = s.executeQuery("SELECT * from 字典 ");
while (rs.next()) {
String a = rs.getString("单词");
String b = rs.getString("词语解释");
text2.append(a+b+"\n");
}
rs.close();
} catch (Exception ea) {
text2.setText("查询数据失败");
}
fw.write(text2.getText());
fw.close();
} catch (IOException ec) {
text2.setText(fileName);
}
text2.setText("词库备份成功！");
}
}
});
fileMenu.add(ECItem);
fileMenu.add(CEItem);
fileMenu.add(BackupItem);
fileMenu.addSeparator();
//退出监听器
fileMenu.add(new
AbstractAction("退出")
{
public void actionPerformed(ActionEvent event)
{
System.exit(0);
}
});
JMenu editMenu = new JMenu("编辑");
JMenuItem addItem = new JMenuItem("添加词汇");
addItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,InputEvent.CTRL_MASK));
//菜单栏增加监听器
addItem.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
if(text1.getText().equals(""))
text2.setText("没有输入内容！请重新增加！！！");
else
{
String s=text1.getText().trim();
String s1=text2.getText().trim();
text2.setText(new add().jadd(text1.getText().trim(),text2.getText().trim()));
text2.append(s+"\n"+s1+";"+" "+"//"+"该内容已增加！！！");
}
}
});
//菜单栏修改监听器
JMenuItem updateItem = new JMenuItem("修改词汇");
updateItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_U,InputEvent.CTRL_MASK));
updateItem.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
if(text1.getText().equals(""))
text2.setText("没输入所要修改的内容！请重新输入！！！！");
else{
String s=text1.getText().trim();
text2.setText(new update().jupdate(text1.getText().trim(),
text2.getText().trim()));
text2.append(s+" "+"//"+"该内容已修改！！！");
}
}
});
//菜单栏删除监听器
JMenuItem deleteItem = new JMenuItem("删除词汇");
deleteItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_D,InputEvent.CTRL_MASK));
deleteItem.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
if(text1.getText().equals(""))
text2.setText("没输入所要删除的内容！请重新输入！！！！");
else{
String s=text1.getText().trim();
text2.setText(new delete().jdelete(text1.getText().trim()));
text2.append(s+" "+"//"+"该内容已删除！！！");
}
}
});
editMenu.add(addItem);
editMenu.add(updateItem);
editMenu.add(deleteItem);
JMenu helpMenu = new JMenu("Help");
helpMenu.setMnemonic('H');
aboutItem = new JMenuItem("About");
aboutItem.setMnemonic('A');
aboutItem.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
new guanyu();
}
});
helpMenu.add(aboutItem);
menubar = new JMenuBar();
setJMenuBar(menubar);
menubar.add(fileMenu);
menubar.add(editMenu);
menubar.add(helpMenu);
//工具栏
label = new JLabel("请输入：");
text1= new JTextField("");
selectButton = new JButton("查询");
//工具栏查询监听器
selectButton.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
if(text1.getText().equals(""))
text2.setText("没有输入查询内容！请重新输入！！！");
else text2.setText(new select().jselect(text1.getText().trim()));
}
});
//工具栏增加监听器
addButton = new JButton("增加");
addButton.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
if(text1.getText().equals(""))
text2.setText("没有输入内容！请重新增加！！！");
else
{
String s=text1.getText().trim();
String s1=text2.getText().trim();
text2.setText(new add().jadd(text1.getText().trim(),text2.getText().trim()));
text2.append(s+"\n"+s1+";"+" "+"//"+"该内容已增加！！！");
}
}
});
//工具栏修改监听器
updateButton = new JButton("修改");
updateButton.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
if(text1.getText().equals(""))
text2.setText("没输入所要修改的内容！请重新输入！！！！");
else{
String s=text1.getText().trim();
text2.setText(new update().jupdate(text1.getText().trim(),
text2.getText().trim()));
text2.append(s+" "+"//"+"该内容已修改！！！");
}
}
});
//工具栏删除监听器
deleteButton = new JButton("删除");
deleteButton.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
if(text1.getText().equals(""))
text2.setText("没输入所要删除的内容！请重新输入！！！！");
else{
String s=text1.getText().trim();
text2.setText(new delete().jdelete(text1.getText().trim()));
text2.append(s+" "+"//"+"该内容已删除！！！");
}
}
});
soundButton = new JButton("读音");
soundButton.addActionListener(new
AbstractAction(){
public void actionPerformed(ActionEvent event)
{
JavaSoundAudioClip player;
try{
strsound = text2.getText().trim();
FileInputStream ff = new FileInputStream("sound//"+strsound+".wav");
player = new JavaSoundAudioClip(ff);
player.play();
}
catch(Exception e) {
System.out.println("error");
e.printStackTrace();
}
}
});
//万年历
dateButton = new JButton("万年历");
dateButton.addActionListener(new
AbstractAction() {
public void actionPerformed(ActionEvent event)
{
new calendar();
}
});
toolbar = new JToolBar();
add(toolbar,BorderLayout.NORTH);
toolbar.add(label);
toolbar.add(text1);
toolbar.add(selectButton);
toolbar.add(addButton);
toolbar.add(updateButton);
toolbar.add(deleteButton);
toolbar.add(soundButton);
toolbar.add(dateButton);
text2 = new JTextArea(8,40);
text2.setLineWrap(true);
JScrollPane scroll = new JScrollPane(text2);
add(scroll,BorderLayout.CENTER);
//快捷菜单 剪切，复制，粘贴
JPopupMenu popup= new JPopupMenu();
text2.setComponentPopupMenu(popup);
popup.add(new
AbstractAction("剪切",new ImageIcon("cut.gif"))
{
public void actionPerformed(ActionEvent event)
{
text2.cut();
}
});
popup.add(new
AbstractAction("复制",new ImageIcon("copy.gif"))
{
public void actionPerformed(ActionEvent event)
{
text2.copy();
}
});
popup.add(new
AbstractAction("粘贴",new ImageIcon("paste.gif"))
{
public void actionPerformed(ActionEvent event)
{
text2.paste();
}
});
text1.setComponentPopupMenu(popup);
}
public static final int DEFAULT_WIDTH = 400;
public static final int DEFAULT_HEIGHT = 250;
private JPanel panel;
private JMenuBar menubar;
private JToolBar toolbar;
private JLabel label;
private JTextField text1;
private JTextArea text2;
private JButton selectButton;
private JButton addButton;
private JButton updateButton;
private JButton deleteButton;
private JButton soundButton;
private JButton dateButton;
private JMenuItem aboutItem;
private Connection con;
private String url;
private Statement s;
private ResultSet rs;
public BufferedWriter Buffer;
private JFileChooser chooser;
private File f;
private JFrame frame;
private int flag;
private boolean b1;
private String strsound;
}
//查询类
class select {
private Connection con;
private String url;
private PreparedStatement pstmt;
private String sql,zz;
private ResultSet rs;
select() {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException ce) {
System.out.println(ce);
}
url = "jdbc:odbc:test";
}
public String jselect(String str) {
try {
con = DriverManager.getConnection(url);
sql = "select 词语解释 from 字典 where 单词=?";
pstmt= con.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
pstmt.setString(1,str);
rs = pstmt.executeQuery();
while (rs.next()) {
System.out.print(rs.getString(1));
zz=rs.getString(1);
System.out.println(" ");
}
rs.close();
pstmt.close();
con.close();
} catch (SQLException ce) {
System.out.println(ce);}
return zz;
}
}
//增加类
class add {
private Connection con;
private String url;
private PreparedStatement pstmt;
private String sql,sql1,zz;
private ResultSet rs;
add() {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException ce) {
System.out.println(ce);
}
url = "jdbc:odbc:test";
}
public String jadd(String str1,String str2) {
try {
con = DriverManager.getConnection(url);
sql = "insert into 字典 values(?,?)";
pstmt= con.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
pstmt.setString(1,str1);
pstmt.setString(2,str2);
pstmt.executeUpdate();
Statement s = con.createStatement();
sql1 = "SELECT * FROM 字典 ";
rs = s.executeQuery(sql1);
while (rs.next()) {
System.out.print(rs.getString(1));
System.out.print(rs.getString(2));
System.out.println(" ");
}
rs.close();
pstmt.close();
con.close();
} catch (SQLException ce) {
System.out.println(ce);}
return zz;
}
}
//修改类
class update {
private Connection con;
private String url;
private PreparedStatement pstmt;
private String sql,sql1,zz;
private ResultSet rs;
update() {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException ce) {
System.out.println(ce);
}
url = "jdbc:odbc:test";
}
public String jupdate(String str1,String str2) {
try {
con = DriverManager.getConnection(url);
sql = "UPDATE 字典 SET 词语解释=? WHERE 单词=?";
pstmt= con.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
pstmt.setString(1,str1);
pstmt.setString(2,str2);
pstmt.executeUpdate();
Statement s = con.createStatement();
sql1 = "SELECT * FROM 字典 ";
rs = s.executeQuery(sql1);
while (rs.next()) {
System.out.print(rs.getString(1));
System.out.print(rs.getString(2));
System.out.println(" ");
}
rs.close();
pstmt.close();
con.close();
} catch (SQLException ce) {
System.out.println(ce);}
return zz;
}
}
//删除类
class delete {
private Connection con;
private String url;
private PreparedStatement pstmt;
private String sql,sql1,zz;
private ResultSet rs;
delete() {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException ce) {
System.out.println(ce);
}
url = "jdbc:odbc:test";
}
public String jdelete(String str1) {
try {
con = DriverManager.getConnection(url);
sql = "delete 字典 WHERE 单词=?";
pstmt= con.prepareStatement(sql,ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
pstmt.setString(1,str1);
pstmt.executeUpdate();
Statement s = con.createStatement();
sql1 = "SELECT * FROM 字典 ";
rs = s.executeQuery(sql1);
while (rs.next()) {
System.out.print(rs.getString(1));
System.out.print(rs.getString(2));
System.out.println(" ");
}
rs.close();
pstmt.close();
con.close();
} catch (SQLException ce) {
System.out.println(ce);}
return zz;
}
}
还有个数据库，如果你能留个邮箱，我把整份程序传给你~希望能帮到你
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