Swing的相关简介

import java.awt.FlowLayout;import java.awt.Frame;import java.awt.Menu;import java.awt.MenuBar;import java.awt.MenuItem;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import javax.swing.JOptionPane;public class Test29 {public static void main(String[] args) {new MenuDeom();    }}class MenuDeom {    MenuDeom() {        init();    }private Frame f;private MenuBar mBar;private Menu menu;private Menu subMenu; // 这是要当作二级菜单的,放在 menu 下private MenuItem mItem1;private MenuItem mItem2;private void init() {        f = new Frame("窗口标题");        f.setBounds(20, 20, 400, 500);        f.setLayout(new FlowLayout());        mBar = new MenuBar(); // 创建一个菜单栏menu = new Menu("文件"); // 创建一个菜单mItem1 = new MenuItem("打开");        mItem2 = new MenuItem("退出");        menu.add(mItem1);        menu.add(mItem2);        subMenu = new Menu();        subMenu.add(new MenuItem("退出"));        menu.add(subMenu);        mBar.add(menu);        f.setMenuBar(mBar);        f.setVisible(true);        initEvent();    }private void initEvent() {        f.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {                System.exit(0);            }        });        mItem1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {                System.out.println("第一个响应了");                JOptionPane.showMessageDialog(null, "这是第一个菜单的响应");            }        });        mItem2.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {                System.out.println("第二个响应了");                JOptionPane.showMessageDialog(null, "这是第二个菜单的响应");            }        });    }}

import java.awt.FileDialog;import java.awt.Frame;import java.awt.Menu;import java.awt.MenuBar;import java.awt.MenuItem;import java.awt.TextArea;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.File;import java.io.FileReader;import java.io.FileWriter;class FileDlgDemo {    FileDlgDemo() {        init();    }private Frame f;private MenuBar mBar;private Menu fileMenu;private MenuItem openItem, saveItem, closeItem;private TextArea txtArea;private FileDialog openFileDlg; // 文件打开对话框private FileDialog saveFileDlg; // 文件保存对话框private File file;private void init() {        f = new Frame("记事本");        f.setBounds(50, 50, 400, 200);        mBar = new MenuBar();        fileMenu = new Menu("文件");        openItem = new MenuItem("打开");        saveItem = new MenuItem("保存");        closeItem = new MenuItem("退出");        fileMenu.add(openItem);        fileMenu.add(saveItem);        fileMenu.add(closeItem);        mBar.add(fileMenu);        f.setMenuBar(mBar);        f.setVisible(true);        openFileDlg = new FileDialog(f, "文件打开对话框", FileDialog.LOAD);        saveFileDlg = new FileDialog(f, "文件保存对话框", FileDialog.SAVE);        txtArea = new TextArea();        f.add(txtArea);        initEvent();    }private void initEvent() {        f.addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {                System.exit(0);            }        });// 打开openItem.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try {                    openFileDlg.setVisible(true);                    String driStr = openFileDlg.getDirectory();                    String fileName = openFileDlg.getFile();// System.out.println(driStr+":"+fileName);BufferedReader br = new BufferedReader(new FileReader(                            driStr + fileName));             <a>本文来源gao*daima.com搞@代#码&网6</a>       String str = null;while ((str = br.readLine()) != null) {                        txtArea.append(str + "\r\n");                    }                    br.close();                } catch (Exception ex) {                    ex.printStackTrace();                }            }        });// 文件保存saveItem.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {try {                    saveFileDlg.setVisible(true);                    String dirStr = saveFileDlg.getDirectory();                    String fileName = saveFileDlg.getFile();if (fileName != null && dirStr != null) {                        file = new File(dirStr, fileName);                        BufferedWriter bw = new BufferedWriter(new FileWriter(file));                        String content = txtArea.getText();                        bw.write(content);                        bw.close();                    }                } catch (Exception ex) {                    ex.printStackTrace();                }            }        });    }}public class Test30 {public static void main(String[] args) {new FileDlgDemo();    }}