案例3：JAVA GUI 随机点名程序

先开发一个姓名维护的界面，输入学生的姓名，每行录入一个学生姓名，点击保存的时候将学生的姓名保存到一个txt文件中。

再开发一个点名的程序，从维护好的txt文件中，随机读取一个学生的姓名显示出来，表示该学生已被点名。

1.维护名称

 

2.随机点名

 

 

3.源码 

CallNamePage.java

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//GUI界面 package CallName; import java.awt.Toolkit; import java.awt.event.*;   import javax.swing.*; //点名程序 public class CallNamePage extends JFrame {     JTextField txt11 = new JTextField();     JButton btn = new JButton("随机点名");     JButton btn2 = new JButton("姓名维护");       public CallNamePage() {         super("标题");         final JLabel lab = new JLabel("点名中....");         lab.setBounds(120, 40, 120, 40);         txt11.setBounds(120, 100, 120, 40);         btn.setBounds(120, 160, 120, 40);         btn2.setBounds(120, 210, 120, 40);         //事件         btn.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent ee) {                 lab.setText("新的幸运儿已经产生");                 CallNameTool tool  =new CallNameTool();                 try{                     txt11.setText(tool.DoCallName());                 }                 catch(Exception ex)                 {                     JOptionPane.showMessageDialog(null, "点名失败");                 }             }         });         btn2.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent ee) {                 CallNameSetting st=new CallNameSetting();                 st.CenterPanel();             }         });           // 将控件添加到容器         JPanel p = new JPanel();         p.setLayout(null);         // 布局标题         p.add(lab);         p.add(txt11);         p.add(btn);         p.add(btn2);         getContentPane().add(p);         setSize(400, 400);         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         setVisible(true);       }       // 将界面开始位置显示到屏幕中间     public void CenterPanel() {         int width = Toolkit.getDefaultToolkit().getScreenSize().width;         int height = Toolkit.getDefaultToolkit().getScreenSize().height;         this.setLocation(width / 2, height / 4);     }   }

　　

CallNameSetting.java

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//游戏主界面 package CallName; import java.awt.Toolkit; import java.awt.event.*;   import javax.swing.*;   //点名设置界面 public class CallNameSetting extends JFrame {     // 输入用户列表     JLabel tip=new JLabel("提示：按每个姓名为一行进行维护。");     JTextArea txt11=new JTextArea();     // 功能按钮     JButton btnSave = new JButton("保存设置");     JButton btnBegin = new JButton("开始点名");       public CallNameSetting() {         super("点名设置");         tip.setBounds(20, 10, 220, 20);         txt11.setBounds(20, 40, 220, 200);           btnSave.setBounds(20, 270, 100, 20);         btnBegin.setBounds(150, 270, 100, 20);           btnSave.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent ee) {                 CallNameTool tool=new CallNameTool();                 try{                     tool.SaveCallName(txt11.getText());                     JOptionPane.showMessageDialog(null, "已保存！");                 }                 catch(Exception ex)                 {                     //                     JOptionPane.showMessageDialog(null, "保存失败");                 }             }         });                   btnBegin.addActionListener(new ActionListener() {             public void actionPerformed(ActionEvent ee) {                 CallNamePage cp=new CallNamePage();                 cp.CenterPanel();             }         });           // 将控件添加到容器         JPanel p = new JPanel();         p.setLayout(null);         p.add(tip);         p.add(txt11);                   p.add(btnSave);         p.add(btnBegin);                   getContentPane().add(p);         setSize(300, 400);         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);         setVisible(true);                   //初始化姓名列表         CallNameTool tool=new CallNameTool();         try{             String result=tool.GetCallName();             txt11.setText(result);         }         catch(Exception ex)         {             //             JOptionPane.showMessageDialog(null, "读取用户配置文件失败");         }                 }       // 程序入口     public static void main(String[] args) {         CallNameSetting s = new CallNameSetting();         s.CenterPanel();     }       // 将界面开始位置显示到屏幕中间     public void CenterPanel() {         int width = Toolkit.getDefaultToolkit().getScreenSize().width;         int height = Toolkit.getDefaultToolkit().getScreenSize().height;         this.setLocation(width / 2, height / 4);     } }

　　

CallNameTool.java

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package CallName; import java.io.BufferedReader; import java.io.File; import java.io.FileOutputStream; import java.io.FileReader; import java.io.IOException; import java.util.ArrayList; import java.util.Random; //实现点名功能 public class CallNameTool {     //随机读取一个姓名     public static String DoCallName() throws IOException {         BufferedReader br=new BufferedReader(new FileReader("name.txt"));         ArrayList<String> array=new ArrayList<>();         String line;         //读取文件内容到ArrayList         while ((line= br.readLine())!=null){             array.add(line);             }             br.close();             //随机返回一个姓名             Random r=new Random();             int index = r.nextInt(array.size());             String name = array.get(index);             return name;         }           //读取所有姓名     public static String GetCallName() throws IOException {         BufferedReader br=new BufferedReader(new FileReader("name.txt"));         String result="";         String line;         //读取文件内容到ArrayList         while ((line= br.readLine())!=null){             result+=line+"\n";             }             br.close();             return result;         }           //保存姓名     public static void SaveCallName(String content) throws IOException {         String word = content;         FileOutputStream fileOutputStream = null;         File file = new File("name.txt");         if(!file.exists()){             file.createNewFile();         }         fileOutputStream = new FileOutputStream(file);         fileOutputStream.write(word.getBytes("gbk"));         fileOutputStream.flush();         fileOutputStream.close();     } }