java swing一篇轻松学习（高考后可以自学）

前言：

本文会将swing从0到jdbc操作全部讲完，希望能对大家有所帮助。

环境与工具：

系统环境：win10

开发工具：Eclipse IDE for Java Developers - 2020-09

数据库：MySQL5.6

正文：

目录

前言：

环境与工具：

正文：

1、swing窗口和面板容器

窗口：(JFrame)

​编辑

面板：(JPanel)

2、swing布局管理setLayout

边框布局BorderLayout

​编辑

流式布局管理器FlowLayout

卡片布局CardLayout

网格布局GridLayout

3、swing标签JLabel

4、swing按钮

5、swing的表单操作（文本框、文本域、单选、复选、下拉）

文本框JTextField：

文本域JTextArea：

单选框JRadioButton：

复选框JCheckBox：

下拉JComboBox：

6、swing列表框JList

7、swing事件监听Event

8、swing菜单JMenu

9、swing工具栏JToolBar

10、swing文件选择器JFileChooser

11、swing对话框JOptionPane

​编辑 ​编辑​编辑​编辑

12、swing表格JTable

随便创建一个java项目就行，swing包是自带的。

1、swing窗口和面板容器

窗口：(JFrame)

这里是类继承【JFrame】，然后完成基本设置，一定要显示true，不然看不见。

package com.item.swings;import java.awt.Container;import javax.swing.JFrame;import javax.swing.JLabel;public class Action extends JFrame{private static final long serialVersionUID = 1L;public Action() {//设置显示窗口标题setTitle("大标题，就是左上角显示的标题");//设置窗口显示尺寸setSize(666,200); //设置窗口是否可以关闭setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //创建一个标签JLabel lable=new JLabel("lable就是一个文本");//获取本窗口的内容窗格Container c=getContentPane();//将lable标签组件添加到内容窗格上c.add(lable);//设置本窗口是否可见setVisible(true);}public static void main(String[] args) {new Action();}}

面板：(JPanel)

是一种中间层容器，它能容纳组件并将组件组合在一起，但它本身必须添加到其他容器中使用。

package com.item.swings;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Component;import java.awt.Container;import java.awt.Dimension;import java.awt.FlowLayout;import java.awt.Font;import java.awt.LayoutManager;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;public class Action1 extends JFrame{private static final long serialVersionUID = 1L;public Action1() {// TODO Auto-generated constructor stubsetTitle("面板测试");//设置窗口位置和大小·前面俩是x y轴,后面俩是长高setBounds(600, 300, 1200, 200);//创建一个面板对象JPanel jp=new JPanel();//创建一个文本标签JLabel jl=new JLabel("祝愿程序员都会开心幸福安康。");jl.setFont(new Font("黑体",Font.BOLD,66));jl.setLayout(new FlowLayout(FlowLayout.CENTER));jp.setBackground(Color.pink);//设置背景色·喜欢粉色jp.add(jl);//将标签添加到面板add(jp);//将面板添加到窗口setVisible(true);//设置窗口可见setDefaultCloseOperation(EXIT_ON_CLOSE);//别忘关闭窗口}public static void main(String[] args) {new Action1();}}

2、swing布局管理setLayout

边框布局BorderLayout

也就是需要自己定制位置：

package com.item.swings;import java.awt.BorderLayout;import javax.swing.JButton;import javax.swing.JFrame;public class Action2 extends JFrame{private static final long serialVersionUID = 1L;public Action2() {// TODO Auto-generated constructor stubsetSize(400,200);//为Frame窗口设置布局为边框布局:BorderLayoutsetLayout(new BorderLayout());JButton button1=new JButton ("上·一般写标题或菜单");JButton button2=new JButton("左·写菜单的比较多，但不一定用");JButton button3=new JButton("中·表格信息");JButton button4=new JButton("右·很少用到");JButton button5=new JButton("下·备案号啥的");//上n下s左w右e中centeradd(button1,BorderLayout.NORTH);add(button2,BorderLayout.WEST);add(button3,BorderLayout.CENTER);add(button4,BorderLayout.EAST);add(button5,BorderLayout.SOUTH);setBounds(300,200,600,300);setVisible(true);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}public static void main(String[] args) {new Action2();}}

咱们一般用的是上左右结构：

流式布局管理器FlowLayout

自己从上到下从左到右排序：

package com.item.swings;import java.awt.BorderLayout;import java.awt.Color;import java.awt.FlowLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;public class Action3 extends JFrame{private static final long serialVersionUID = 1L;public Action3() {// TODO Auto-generated constructor stubsetTitle("流式布局");setSize(400,200);        JPanel jPanel=new JPanel();//创建面板        JButton btn1=new JButton("1");//创建按钮        JButton btn2=new JButton("2");        JButton btn3=new JButton("3");        JButton btn4=new JButton("4");        JButton btn5=new JButton("5");        JButton btn6=new JButton("6");        JButton btn7=new JButton("7");        //按钮背景色        btn7.setBackground(Color.BLUE);        //按钮文字颜色        btn7.setForeground(Color.WHITE);        JButton btn8=new JButton("8");        JButton btn9=new JButton("9");        jPanel.add(btn1);//面板中添加按钮        jPanel.add(btn2);        jPanel.add(btn3);        jPanel.add(btn4);        jPanel.add(btn5);        jPanel.add(btn6);        jPanel.add(btn7);        jPanel.add(btn8);        jPanel.add(btn9);        //向JPanel添加FlowLayout布局管理器，将组件间的横向和纵向间隙都设置为20像素        jPanel.setLayout(new FlowLayout(FlowLayout.LEADING,20,20));        jPanel.setBackground(Color.pink);    //设置背景色        add(jPanel);    //添加面板到容器        setBounds(300,200,300,150);    //设置容器的大小        setVisible(true);        setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action3();}}

由于没有设置固定锁死的边框，所以可以拖拽。测试一下流，看看拉宽的效果：

卡片布局CardLayout

这个能用于切换，毕竟【cards.add(p1,"card1");】可以通过判断来处理：

package com.item.swings;import java.awt.BorderLayout;import java.awt.CardLayout;import java.awt.Color;import java.awt.FlowLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;public class Action4 extends JFrame{private static final long serialVersionUID = 1L;public Action4() {// TODO Auto-generated constructor stubsetTitle("卡牌布局");setSize(400,200);JPanel p1=new JPanel();    //面板1JPanel p2=new JPanel();    //面板2JPanel cards=new JPanel(new CardLayout());    //卡片式布局的面板p1.add(new JButton("登录按钮"));p1.add(new JButton("注册按钮"));p1.add(new JButton("找回密码按钮"));p2.add(new JTextField("用户名文本框",20));p2.add(new JTextField("密码文本框",20));p2.add(new JTextField("验证码文本框",20));cards.add(p1,"card1");    //向卡片式布局面板中添加面板1cards.add(p2,"card2");    //向卡片式布局面板中添加面板2CardLayout cl=(CardLayout)(cards.getLayout());cl.show(cards,"card1");    //调用show()方法显示面板1//cl.show(cards,"card2");    //调用show()方法显示面板2add(cards);setBounds(300,200,400,200);setVisible(true);setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action4();}}

package com.item.swings;import java.awt.BorderLayout;import java.awt.CardLayout;import java.awt.Color;import java.awt.FlowLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;public class Action4 extends JFrame{private static final long serialVersionUID = 1L;public Action4() {// TODO Auto-generated constructor stubsetTitle("卡牌布局");setSize(400,200);JPanel p1=new JPanel();    //面板1JPanel p2=new JPanel();    //面板2JPanel cards=new JPanel(new CardLayout());    //卡片式布局的面板p1.add(new JButton("登录按钮"));p1.add(new JButton("注册按钮"));p1.add(new JButton("找回密码按钮"));p2.add(new JTextField("用户名文本框",20));p2.add(new JTextField("密码文本框",20));p2.add(new JTextField("验证码文本框",20));cards.add(p1,"card1");    //向卡片式布局面板中添加面板1cards.add(p2,"card2");    //向卡片式布局面板中添加面板2CardLayout cl=(CardLayout)(cards.getLayout());//cl.show(cards,"card1");    //调用show()方法显示面板1cl.show(cards,"card2");    //调用show()方法显示面板2add(cards);setBounds(300,200,400,200);setVisible(true);setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action4();}}

网格布局GridLayout

也就是【CSS的栅格化】布局类似

package com.item.swings;import java.awt.BorderLayout;import java.awt.CardLayout;import java.awt.Color;import java.awt.FlowLayout;import java.awt.Font;import java.awt.GridLayout;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField;public class Action4 extends JFrame{private static final long serialVersionUID = 1L;public Action4() {// TODO Auto-generated constructor stubsetTitle("网格布局");setSize(400,200);        JPanel panel=new JPanel();//创建面板        //指定面板的布局为GridLayout，4行4列，间隙为10        panel.setLayout(new GridLayout(4,4,10,10));        Font font = new Font("黑体",Font.BOLD,50);        panel.add(new JButton("7"));//添加按钮        panel.add(new JButton("8"));        panel.add(new JButton("9"));        panel.add(new JButton("/"));        panel.add(new JButton("4"));        panel.add(new JButton("5"));        panel.add(new JButton("6"));        panel.add(new JButton("*"));        panel.add(new JButton("1"));        panel.add(new JButton("2"));        panel.add(new JButton("3"));        panel.add(new JButton("-"));        panel.add(new JButton("0"));        panel.add(new JButton("."));        JButton butResult = new JButton("=");        butResult.setFont(font);        panel.add(butResult);        panel.add(new JButton("+"));        add(panel);    //添加面板到容器        setBounds(300,200,666,300);        setVisible(true);        setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action4();}}

3、swing标签JLabel

package com.item.swings;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;public class Action6 extends JFrame{private static final long serialVersionUID = 1L;public Action6() {// TODO Auto-generated constructor stubsetTitle("测试");setSize(400,200);JPanel jp=new JPanel();    //创建面板        JLabel label1=new JLabel("1、普通标签");    //创建标签        JLabel label2=new JLabel();        label2.setText("2、调用setText()方法");        //创建既含有文本又含有图标的JLabel对象        jp.add(label1);//添加标签到面板        jp.add(label2);        add(jp);        setBounds(300,200,400,100);        setVisible(true);        setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action6();}}

4、swing按钮

package com.item.swings;import java.awt.Color;import java.awt.Dimension;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.SwingConstants;public class Action7 extends JFrame{private static final long serialVersionUID = 1L;public Action7() {// TODO Auto-generated constructor stubsetTitle("按鈕");setSize(400,200);JPanel jp=new JPanel();    //创建JPanel对象        JButton btn1=new JButton("我是普通按钮");    //创建JButton对象        JButton btn2=new JButton("我是带背景颜色按钮");        JButton btn3=new JButton("我是不可用按钮");        JButton btn4=new JButton("我是底部对齐按钮");        jp.add(btn1);        btn2.setBackground(Color.YELLOW);    //设置按钮背景色        jp.add(btn2);        btn3.setEnabled(false);    //设置按钮不可用        jp.add(btn3);        Dimension preferredSize=new Dimension(160, 60);    //设置尺寸        btn4.setPreferredSize(preferredSize);    //设置按钮大小        btn4.setVerticalAlignment(SwingConstants.BOTTOM);    //设置按钮垂直对齐方式        jp.add(btn4);        add(jp);        setBounds(300, 200, 600, 300);        setVisible(true);        setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action7();}}

5、swing的表单操作（文本框、文本域、单选、复选、下拉）

文本框JTextField：

package com.item.swings;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.SwingConstants;public class Action8 extends JFrame{private static final long serialVersionUID = 1L;public Action8() {// TODO Auto-generated constructor stubsetTitle("文本输入框");setSize(600,300);JPanel jp=new JPanel();    //创建面板        JTextField txtfield1=new JTextField();    //创建文本框        txtfield1.setText("普通文本框");    //设置文本框的内容        JTextField txtfield2=new JTextField(28);        txtfield2.setFont(new Font("楷体",Font.BOLD,16));    //修改字体样式        txtfield2.setText("指定长度和字体的文本框");        JTextField txtfield3=new JTextField(30);        txtfield3.setText("居中对齐");        txtfield3.setHorizontalAlignment(JTextField.CENTER);    //居中对齐        jp.add(txtfield1);        jp.add(txtfield2);        jp.add(txtfield3);        add(jp);        setVisible(true);        setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action8();}}

文本域JTextArea：

package com.item.swings;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.SwingConstants;public class Action8 extends JFrame{private static final long serialVersionUID = 1L;public Action8() {// TODO Auto-generated constructor stubsetTitle("文本输入框");setSize(600,300);JPanel jp=new JPanel();    //创建一个JPanel对象        JTextArea jta=new JTextArea("请输入内容",7,30);        jta.setLineWrap(true);    //设置文本域中的文本为自动换行        jta.setForeground(Color.BLACK);    //设置组件的背景色        jta.setFont(new Font("楷体",Font.BOLD,16));    //修改字体样式        jta.setBackground(Color.YELLOW);    //设置按钮背景色        JScrollPane jsp=new JScrollPane(jta);    //将文本域放入滚动窗口        Dimension size=jta.getPreferredSize();    //获得文本域的首选大小        jsp.setBounds(110,90,size.width,size.height);        jp.add(jsp);    //将JScrollPane添加到JPanel容器中        add(jp);    //将JPanel容器添加到JFrame容器中        setBackground(Color.pink);        setSize(400,200);    //设置JFrame容器的大小        setVisible(true);        setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action8();}}

单选框JRadioButton：

package com.item.swings;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import javax.swing.ButtonGroup;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JRadioButton;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.SwingConstants;public class Action8 extends JFrame{private static final long serialVersionUID = 1L;public Action8() {// TODO Auto-generated constructor stubsetTitle("文本输入框");setSize(800,100);JPanel panel=new JPanel();    //创建面板        JLabel label1=new JLabel("今日翻牌子：");        JRadioButton rb1=new JRadioButton("海棠");    //创建JRadioButton对象        JRadioButton rb2=new JRadioButton("夏竹");    //创建JRadioButton对象        JRadioButton rb3=new JRadioButton("秋香",true);    //创建JRadioButton对象        JRadioButton rb4=new JRadioButton("冬梅");    //创建JRadioButton对象        label1.setFont(new Font("华文行楷",Font.BOLD,26));    //修改字体样式        ButtonGroup group=new ButtonGroup();        //添加JRadioButton到ButtonGroup中        group.add(rb1);        group.add(rb2);        panel.add(label1);        panel.add(rb1);        panel.add(rb2);        panel.add(rb3);        panel.add(rb4);        add(panel);           setBackground(Color.pink);        setVisible(true);        setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action8();}}

复选框JCheckBox：

package com.item.swings;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import javax.swing.ButtonGroup;import javax.swing.JButton;import javax.swing.JCheckBox;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JRadioButton;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.SwingConstants;public class Action8 extends JFrame{private static final long serialVersionUID = 1L;public Action8() {// TODO Auto-generated constructor stubsetTitle("文本输入框");setSize(800,100);JPanel jp=new JPanel();    //创建面板        JLabel label=new JLabel("嵩山秘术·初子决：");        label.setFont(new Font("华文行楷",Font.BOLD,26));    //修改字体样式        JCheckBox chkbox1=new JCheckBox("拙石", true);    //创建指定文本和状态的复选框        JCheckBox chkbox2=new JCheckBox("璞玉");    //创建指定文本的复选框        JCheckBox chkbox3=new JCheckBox("破梦", true);         JCheckBox chkbox4=new JCheckBox("灭神");         JCheckBox chkbox5=new JCheckBox("诸佛", true);        JCheckBox chkbox6=new JCheckBox("戳魔");        jp.add(label);        jp.add(chkbox1);        jp.add(chkbox2);        jp.add(chkbox3);        jp.add(chkbox4);        jp.add(chkbox5);        jp.add(chkbox6);        add(jp);        setBackground(Color.pink);        setVisible(true);        setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action8();}}

下拉JComboBox：

package com.item.swings;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import javax.swing.ButtonGroup;import javax.swing.JButton;import javax.swing.JCheckBox;import javax.swing.JComboBox;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JRadioButton;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.SwingConstants;public class Action8 extends JFrame{private static final long serialVersionUID = 1L;public Action8() {// TODO Auto-generated constructor stubsetTitle("文本输入框");setSize(800,100);JPanel jp=new JPanel();    //创建面板JLabel label1=new JLabel("幸福模式：");    //创建标签JComboBox cmb=new JComboBox();    //创建JComboBoxcmb.addItem("--请选择--");    //向下拉列表中添加一项cmb.addItem("长命百岁");cmb.addItem("幸福安康");cmb.addItem("颐养天年");jp.add(label1);jp.add(cmb);add(jp);setBackground(Color.pink);setVisible(true);setDefaultCloseOperation(EXIT_ON_CLOSE);}public static void main(String[] args) {new Action8();}}

6、swing列表框JList

package com.item.swings;import java.awt.BorderLayout;import java.awt.Color;import java.awt.Dimension;import java.awt.Font;import javax.swing.ButtonGroup;import javax.swing.JButton;import javax.swing.JCheckBox;import javax.swing.JComboBox;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JList;import javax.swing.JPanel;import javax.swing.JRadioButton;import javax.swing.JScrollPane;import javax.swing.JTextArea;import javax.swing.JTextField;import javax.swing.ListSelectionModel;import javax.swing.SwingConstants;import javax.swing.border.EmptyBorder;public class Action8 extends JFrame{private static final long serialVersionUID = 1L;public Action8() {// TODO Auto-generated constructor stubsetTitle("文本输入框");setBounds(500,100,500,200);    //设置窗体位置和大小        JPanel contentPane=new JPanel();    //创建内容面板        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));    //设置面板的边框        contentPane.setLayout(new BorderLayout(0, 0));    //设置内容面板为边界布局        setContentPane(contentPane);    //应用内容面板        JScrollPane scrollPane=new JScrollPane();    //创建滚动面板        contentPane.add(scrollPane,BorderLayout.CENTER);    //将面板增加到边界布局中央        JList list=new JList();        //限制只能选择一个元素        list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);        scrollPane.setViewportView(list);    //在滚动面板中显示列表        String[] listData=new String[12];    //创建一个含有12个元素的数组        for (int i=0;i

package com.item.swings;import java.awt.BorderLayout;import java.awt.Font;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JList;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;public class demo9 extends JFrame{JList list;JLabel label;JButton button1;int clicks=0;public demo9(){setTitle("动作事件监听器示例");setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setBounds(500,300,400,200);JPanel contentPane=new JPanel();contentPane.setBorder(new EmptyBorder(5,5,5,5));contentPane.setLayout(new BorderLayout(0,0));setContentPane(contentPane);label=new JLabel("还未点击过");label.setFont(new Font("楷体",Font.BOLD,16));    //修改字体样式contentPane.add(label, BorderLayout.SOUTH);button1=new JButton("我是普通按钮");    //创建JButton对象button1.setFont(new Font("黑体",Font.BOLD,16));    //修改字体样式button1.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){label.setText("按钮被单击了 "+(clicks++)+" 次");}});new Thread(new Runnable() {@Overridepublic void run() {while (true) {try {Thread.sleep(1000);} catch (InterruptedException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}label.setText("自动点击了1次，当前 "+(clicks++)+" 次");}}}).start();contentPane.add(button1);setVisible(true);}public static void main(String[] args){new demo9();}}

package com.item.swings;import java.awt.event.ActionEvent;import java.awt.event.KeyEvent;import javax.swing.JCheckBoxMenuItem;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.KeyStroke;public class demo10 extends JMenuBar{private static final long serialVersionUID = 1L;public demo10(){add(createFileMenu());    //添加文件菜单add(createEditMenu());    //添加编辑菜单setVisible(true);}public static void main(String[] agrs){JFrame frame=new JFrame("菜单栏");frame.setSize(300,200); frame.setJMenuBar(new demo10());frame.setVisible(true);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}//定义文件菜单private JMenu createFileMenu(){JMenu menu=new JMenu("文件(F)");menu.setMnemonic(KeyEvent.VK_F);    //设置快速访问符JMenuItem item=new JMenuItem("新建(N)",KeyEvent.VK_N);item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N,ActionEvent.CTRL_MASK));menu.add(item);item=new JMenuItem("打开(O)",KeyEvent.VK_O);item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,ActionEvent.CTRL_MASK));menu.add(item);item=new JMenuItem("保存(S)",KeyEvent.VK_S);item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,ActionEvent.CTRL_MASK));menu.add(item);menu.addSeparator();item=new JMenuItem("退出(E)",KeyEvent.VK_E);item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E,ActionEvent.CTRL_MASK));menu.add(item);return menu;}//定义“编辑”菜单private JMenu createEditMenu(){JMenu menu=new JMenu("编辑(E)");menu.setMnemonic(KeyEvent.VK_E);JMenuItem item=new JMenuItem("撤销(U)",KeyEvent.VK_U);item.setEnabled(false);menu.add(item);menu.addSeparator();item=new JMenuItem("剪贴(T)",KeyEvent.VK_T);menu.add(item);item=new JMenuItem("复制(C)",KeyEvent.VK_C);menu.add(item);menu.addSeparator();JCheckBoxMenuItem cbMenuItem=new JCheckBoxMenuItem("自动换行");menu.add(cbMenuItem);return menu;}}

package com.item.swings;import javax.swing.*;import java.awt.*;import java.awt.event.*;import java.net.URL;import javax.swing.ImageIcon;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JToolBar;public class ToolBarDemo extends JPanel implements ActionListener{    protected JTextArea textArea;    protected String newline="\n";    static final private String OPEN="OPEN";    static final private String SAVE="SAVE";    static final private String NEW="NEW";       //事件监听器部分的代码省略，请查阅源文件    protected void displayResult(String actionDescription)    {        textArea.append(actionDescription+newline);    }    public static void main(String[] args)    {        JFrame.setDefaultLookAndFeelDecorated(true);        //定义窗体        JFrame frame=new JFrame("工具栏");        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        //定义面板        ToolBarDemo newContentPane=new ToolBarDemo();        newContentPane.setOpaque(true);        frame.setContentPane(newContentPane);        //显示窗体        frame.pack();        frame.setVisible(true);    }    @Override    public void actionPerformed(ActionEvent e)    {        // TODO 自动生成的方法存根    }    public ToolBarDemo()    {        super(new BorderLayout());        //创建工具栏        JToolBar toolBar=new JToolBar();        addButtons(toolBar);        //创建一个文本域，用来输出一些信息        textArea=new JTextArea(15, 30);        textArea.setEditable(false);        JScrollPane scrollPane=new JScrollPane(textArea);        //把组件添加到面板中        setPreferredSize(new Dimension(450, 110));        add(toolBar,BorderLayout.PAGE_START);        add(scrollPane,BorderLayout.CENTER);    }    protected void addButtons(JToolBar toolBar)    {        JButton button=null;        button=makeNavigationButton("test",NEW,"新建一个文件","新建");        toolBar.add(button);        button=makeNavigationButton("test",OPEN,"打开一个文件","打开");        toolBar.add(button);        button=makeNavigationButton("test",SAVE,"保存当前文件","保存");        toolBar.add(button);    }    protected JButton makeNavigationButton(String imageName,String actionCommand,String toolTipText,String altText)    {        //搜索图片        String imgLocation=imageName+".jpg";        URL imageURL=ToolBarDemo.class.getResource(imgLocation);        //初始化工具按钮        JButton button=new JButton();        //设置按钮的命令        button.setActionCommand(actionCommand);        //设置提示信息        button.setToolTipText(toolTipText);        button.addActionListener(this);        if(imageURL!=null)        {            //找到图像            button.setIcon(new ImageIcon(imageURL));        }        else        {            //没有图像            button.setText(altText);            System.err.println("Resource not found: "+imgLocation);        }        return button;    }}

package com.item.swings;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFileChooser;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;public class JFileChooserDemo{    private JLabel label=new JLabel("所选文件路径：");    private JTextField jtf=new JTextField(25);    private JButton button=new JButton("浏览");    public JFileChooserDemo()    {        JFrame jf=new JFrame("文件选择器");        JPanel panel=new JPanel();        panel.add(label);        panel.add(jtf);        panel.add(button);        jf.add(panel);        jf.pack();    //自动调整大小        jf.setVisible(true);        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);        button.addActionListener(new MyActionListener());    //监听按钮事件    }    //Action事件处理    class MyActionListener implements ActionListener    {        @Override        public void actionPerformed(ActionEvent arg0)        {            JFileChooser fc=new JFileChooser("F:\\");            int val=fc.showOpenDialog(null);    //文件打开对话框            if(val==fc.APPROVE_OPTION)            {                //正常选择文件                jtf.setText(fc.getSelectedFile().toString());            }            else            {                //未正常选择文件，如选择取消按钮                jtf.setText("未选择文件");            }        }    }    public static void main(String[] args)    {        new JFileChooserDemo();    }}

package com.item.swings;import javax.swing.JOptionPane;public class demo11{public demo11() {// TODO Auto-generated constructor stubJOptionPane.showMessageDialog(null,"用户名或密码错误！","错误 ",0);JOptionPane.showMessageDialog(null,"请注册或登录...","提示",1);JOptionPane.showMessageDialog(null,"普通会员无权执行删除操作！","警告",2);JOptionPane.showMessageDialog(null,"你是哪一位？请输入用户名","问题",3);JOptionPane.showMessageDialog(null,"扫描完毕，没有发现病毒！","提示",JOptionPane.PLAIN_MESSAGE);}public static void main(String[] args) {new demo11();}}