JAVA学习第十二天

又是很多天没有写东西了，现把前篇所写的代码改为Applet小程序发上来算是凑数吧。虽然这些天也学了一点点东西，但是少的可怜到不足以用一篇博文来写。告诫自己：一定要坚持！！！

 

一、java程序与Applet小程序其实没有太大区别，只是把你的java程序放在一个extends applet的类里面而已。

二、把main方法改为public void init()。注意，java程序的main方法是在主类里，现在init方法是在extends applet的类里。

三、你的一些静态变量也要换个位置，放到extends applet类的变量定义部分。

四、注意你所用的一些其他资源，如图标等也要更换相应路径。

五、以上心得纯属个人理解，不足取信。

 

 

更改后的代码如下，有兴趣的朋友自行对比：

 

import java.applet.Applet; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class myapp extends Applet { public static JFrame f; public class myswingtest extends JFrame { Container cp; JMenuBar mymenubar; JMenu menufile,menuedit,menuhelp,menufont,menucolor; JMenuItem miopen,misave,miexit,miabout; JCheckBoxMenuItem cbmibold,cbmiitalic,cbmi15; JRadioButtonMenuItem rbmired,rbmigreen,rbmiblue; ButtonGroup bg,bg1; JLabel jlname,jltel,jlstatle,jlsex,jllove,jljob; JComboBox jckjob; JCheckBox jcbgame,jcbnet,jcbreading; JTextField jtname,jttel; JTextArea jta; JButton jbok,jbclose,jbcls; JScrollPane jsp; JRadioButton jrbman,jrbwomen,jrbno; public myswingtest(String s) { super(s); setBounds(206, 100, 600, 500); setDefaultCloseOperation(DISPOSE_ON_CLOSE); mymenubar=new JMenuBar(); menufile=new JMenu("File");menuedit=new JMenu("Edit");menuhelp=new JMenu("Help"); menufont=new JMenu("Font");menucolor=new JMenu("Color"); miopen=new JMenuItem("open");misave=new JMenuItem("save");miexit=new JMenuItem("exit"); miabout=new JMenuItem("about"); rbmired=new JRadioButtonMenuItem("red");rbmigreen=new JRadioButtonMenuItem("green"); rbmiblue=new JRadioButtonMenuItem("blue"); cbmibold=new JCheckBoxMenuItem("bold");cbmiitalic=new JCheckBoxMenuItem("italic"); cbmi15=new JCheckBoxMenuItem("size15"); bg=new ButtonGroup();bg1=new ButtonGroup(); bg.add(rbmired);bg.add(rbmigreen);bg.add(rbmiblue); jlname=new JLabel("姓名: ");jltel =new JLabel("电话: ");jlstatle=new JLabel("您还没有选择文本区的字体格式,默认为正常宋体12号。"); jlsex=new JLabel("性别");jllove=new JLabel("爱好");jljob=new JLabel("职务："); jckjob=new JComboBox(); jckjob.addItem("学生"); jckjob.addItem("技术人员"); jckjob.addItem("业余爱好者"); jbok=new JButton("ok");jbclose=new JButton("close");jbcls=new JButton("clear"); jta=new JTextArea(8, 50); jsp=new JScrollPane(jta); jtname=new JTextField("请输入你的姓名",20);jttel=new JTextField(20); jrbman=new JRadioButton("男性");jrbwomen=new JRadioButton("女性");jrbno=new JRadioButton("暂不公开"); bg1.add(jrbman);bg1.add(jrbwomen);bg1.add(jrbno); jcbgame=new JCheckBox("玩游戏");jcbnet=new JCheckBox("上网");jcbreading=new JCheckBox("阅读"); //建立菜单栏 setJMenuBar(mymenubar); mymenubar.add(menufile);mymenubar.add(menuedit);mymenubar.add(menuhelp); menufile.add(miopen);menufile.add(misave);menufile.addSeparator();menufile.add(miexit); menuedit.add(menufont);menuedit.add(menucolor); menufont.add(cbmibold); menufont.addSeparator(); menufont.add(cbmiitalic);menufont.addSeparator();menufont.add(cbmi15); menucolor.add(rbmired);menucolor.addSeparator();menucolor.add(rbmigreen);menucolor.addSeparator();menucolor.add(rbmiblue); menuhelp.add(miabout); cp=getContentPane(); cp.setLayout(null); Color mycolor=new Color(155,188,100); jlname.setBounds(40, 40, 80, 20); jtname.setBounds(120, 40, 100, 20); jlsex.setBounds(300, 40, 50, 20); jllove.setBounds(430, 40, 80, 20); jltel.setBounds(45, 80, 80, 20); jttel.setBounds(120, 80, 100, 20); jrbman.setBounds(300, 70, 100, 20); jrbman.setBackground(mycolor); jcbgame.setBounds(430, 70, 100, 20); jcbgame.setBackground(mycolor); jljob.setBounds(40, 120, 80, 20); jckjob.setBounds(120, 120, 100, 20); jrbwomen.setBounds(300, 95, 100, 20); jrbwomen.setBackground(mycolor); jcbnet.setBounds(430, 95, 120, 20); jcbnet.setBackground(mycolor); jrbno.setBounds(300, 120, 100, 20); jrbno.setBackground(mycolor); jcbreading.setBounds(430, 120, 100, 20); jcbreading.setBackground(mycolor); jsp.setBounds(15, 160, 560, 150); jlstatle.setBounds(10, 325, 570, 30); jbok.setBounds(100, 370, 100, 30); jbclose.setBounds(400, 370, 100, 30); jbcls.setBounds(250, 370, 100, 30); jta.setBackground(new Color(188, 188, 100)); //add imageicon menufont.setIcon(new ImageIcon("image/font.gif")); menucolor.setIcon(new ImageIcon("image/color.gif")); misave.setIcon(new ImageIcon("image/open.gif")); miopen.setIcon(new ImageIcon("image/save.gif")); miexit.setIcon(new ImageIcon("image/close.gif")); jlname.setIcon(new ImageIcon("image/name.png")); jlsex.setIcon(new ImageIcon("image/sex.gif")); jllove.setIcon(new ImageIcon("image/love.gif")); jltel.setIcon(new ImageIcon("image/tel.gif")); jljob.setIcon(new ImageIcon("image/job.gif")); jbok.setIcon(new ImageIcon("image/ok.gif")); jbok.setIconTextGap(10); jbclose.setIcon(new ImageIcon("image/close.gif")); jbclose.setIconTextGap(10); cp.add(jlname);cp.add(jtname);cp.add(jlsex);cp.add(jllove);cp.add(jltel);cp.add(jttel); cp.add(jrbman);cp.add(jcbgame);cp.add(jljob);cp.add(jckjob);cp.add(jrbwomen); cp.add(jcbnet);cp.add(jrbno);cp.add(jcbreading);cp.add(jsp);cp.add(jlstatle); cp.add(jbok);cp.add(jbclose);cp.add(jbcls); cp.setBackground(mycolor); mymenubar.setBackground(new Color(118,168,88)); JLabel myline=new JLabel();//画个JLabel做分隔线 myline.setBounds(0, 410, 600, 1); myline.setBorder(BorderFactory.createLineBorder(Color.BLACK)); cp.add(myline); JLabel myline1=new JLabel();//画个JLabel做分隔线 myline1.setBounds(260, 0, 1, 160); myline1.setBorder(BorderFactory.createLineBorder(Color.BLACK)); cp.add(myline1); JLabel myline2=new JLabel();//画个JLabel做分隔线 myline2.setBounds(400, 0, 1, 160); myline2.setBorder(BorderFactory.createLineBorder(Color.BLACK)); cp.add(myline2); jta.setLineWrap(true); jlstatle.setBorder(BorderFactory.createLineBorder(Color.BLACK)); //为菜单添加热键、访问键 menufile.setMnemonic('F'); menuedit.setMnemonic('E'); menuhelp.setMnemonic('H'); miopen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,ActionEvent.CTRL_MASK)); misave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,ActionEvent.CTRL_MASK)); miexit.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_E,ActionEvent.CTRL_MASK)); //添加监视器 ml myml =new ml(); jbclose.addActionListener(myml); jbcls.addActionListener(myml); addWindowListener(myml); jtname.addFocusListener(myml); jttel.addFocusListener(myml); jcbgame.addItemListener(myml); jcbnet.addItemListener(myml); jcbreading.addItemListener(myml); jrbman.addItemListener(myml); jrbwomen.addItemListener(myml); jrbno.addItemListener(myml); jckjob.addItemListener(myml); miexit.addActionListener(myml); miopen.addActionListener(myml); misave.addActionListener(myml); miabout.addActionListener(myml); rbmiblue.addActionListener(myml); rbmigreen.addActionListener(myml); rbmired.addActionListener(myml); cbmi15.addActionListener(myml); cbmibold.addActionListener(myml); cbmiitalic.addActionListener(myml); } //事件处理 public class ml implements WindowListener,ItemListener,FocusListener,ActionListener { int fonttype = 0,fontsize=12;String fontcolor="黑色"; @Override public void windowActivated(WindowEvent e) { // TODO Auto-generated method stub jta.append("the window is activated /n"); } @Override public void windowClosed(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowClosing(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowDeactivated(WindowEvent e) { // TODO Auto-generated method stub jta.append("the window is deactivated /n"); } @Override public void windowDeiconified(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowIconified(WindowEvent e) { // TODO Auto-generated method stub } @Override public void windowOpened(WindowEvent e) { // TODO Auto-generated method stub jta.append("the window is opened /n"); } @Override public void itemStateChanged(ItemEvent e) { // TODO Auto-generated method stub if (e.getItemSelectable()==jcbgame) { if(jcbgame.isSelected()==true) {jta.append("您选择了玩游戏。/n");} else {jta.append("您取消了对玩游戏的选择。/n");} } if (e.getItemSelectable()==jcbnet) { if(jcbnet.isSelected()==true) {jta.append("您选择了上网。/n");} else {jta.append("您取消了对上网的选择。/n");} } if (e.getItemSelectable()==jcbreading) { if(jcbreading.isSelected()==true) {jta.append("您选择了阅读。/n");} else {jta.append("您取消了对阅读的选择。/n");} } if (e.getItemSelectable()==jrbman) { if(jrbman.isSelected()==true) {jta.append("您选择了男性。/n");} } if (e.getItemSelectable()==jrbwomen) { if(jrbwomen.isSelected()==true) {jta.append("您选择了女性。/n");} } if (e.getItemSelectable()==jrbno) { if(jrbno.isSelected()==true) {jta.append("您选择了不公开性别。/n");} } if (e.getSource()==jckjob && e.getStateChange()==ItemEvent.SELECTED) {jta.append("你的身份为:"+jckjob.getSelectedItem()+"/n");} } @Override public void focusGained(FocusEvent e) { // TODO Auto-generated method stub if(e.getSource()==jtname) { jta.append("请输入你的姓名 /n"); jtname.selectAll(); } else if(e.getSource()==jttel) {jta.append("请输入你的电话号码 /n");} } @Override public void focusLost(FocusEvent e) { // TODO Auto-generated method stub if (e.getSource()==jtname && jtname.getText().length()==0) {jtname.setText("请输入你的姓名");} } @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub String m=e.getActionCommand(); if (m=="close"){ int fh=JOptionPane.showConfirmDialog(myswingtest.this, "您确定要退出吗？","系统提示",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE); if (fh==JOptionPane.YES_OPTION){System.exit(0);}} else if (m=="clear"){jta.setText(null);} else if (m=="exit"){ int ff=JOptionPane.showConfirmDialog(myswingtest.this, "您确定要退出吗？","系统提示",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE); if (ff==JOptionPane.YES_OPTION){System.exit(0);}} else if (m=="about"){ JOptionPane.showMessageDialog(myswingtest.this, "这是一个常用的Swing组件测试程序.", "关于...", JOptionPane.INFORMATION_MESSAGE);} else if (m=="bold" && cbmibold.isSelected()) { if(cbmiitalic.isSelected()) {fonttype=Font.ITALIC+Font.BOLD;}else {fonttype=Font.BOLD;} if(cbmi15.isSelected()) {fontsize=15;}else {fontsize=12;} } else if (m=="bold" && !cbmibold.isSelected()) { if(cbmiitalic.isSelected()) {fonttype=Font.ITALIC;}else {fonttype=Font.PLAIN;} if(cbmi15.isSelected()) {fontsize=15;}else {fontsize=12;} } else if (m=="italic" && cbmiitalic.isSelected()) { if(cbmibold.isSelected()) {fonttype=Font.ITALIC+Font.BOLD;}else {fonttype=Font.ITALIC;} if(cbmi15.isSelected()) {fontsize=15;}else {fontsize=12;} } else if (m=="italic" && !cbmiitalic.isSelected()) { if(cbmibold.isSelected()) {fonttype=Font.BOLD;}else {fonttype=Font.PLAIN;} if(cbmi15.isSelected()) {fontsize=15;}else {fontsize=12;} } else if (m=="size15") { if(cbmi15.isSelected()) {fontsize=15;}else {fontsize=12;} } else if(m=="red") {jta.setForeground(Color.RED);fontcolor="红色";} else if(m=="blue") {jta.setForeground(Color.BLUE);fontcolor="蓝色";} else if(m=="green") {jta.setForeground(Color.GREEN);fontcolor="绿色";} else if(m=="ok") { } jta.setFont(new Font("宋体", fonttype, fontsize)); jlstatle.setText("当前字体设置：宋体，"+String.valueOf(fonttype)+"，"+String.valueOf(fontsize)+"，颜色："+fontcolor); } } } public void init() { f=new myswingtest("test my swing component"); f.setVisible(true); f.setResizable(false); f.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { int jj=JOptionPane.showConfirmDialog(f, "你确定要退出吗？","系统提示",JOptionPane.YES_NO_OPTION,JOptionPane.QUESTION_MESSAGE); if (jj==JOptionPane.YES_OPTION)System.exit(0); } }); } }