程序运行出现使用了未经检查或不安全的操作
import javax.swing.*;import java.awt.event.*;
import java.awt.*;
import *;
public class jishiben{
public static void main(String args[]){
FirstWindow win=new FirstWindow("记事本");
}
}
class FirstWindow extends JFrame implements ActionListener{
JMenuBar menubar;
JTextArea text;
JFileChooser fileChooser;
JMenu menu,menu1,menu3,menu4;
JPopupMenu menu2;
JMenuItem itemOpen,itemSave,itemSave2,itemExit,itemCopy,itemCut,itemPaste,itemQuanxuan,
itemPCopy,itemPCut,itemPPaste,itemPQuanxuan,itemZi,itemGuanyu;
JCheckBoxMenuItem itemHang;//复选按钮换行
FirstWindow(String s){
setTitle(s);
setSize(160,170);
setLocation(600,400);
setBounds(120,100,600,400);
text=new JTextArea();
menubar=new JMenuBar();
menu=new JMenu("文件");
menu1=new JMenu("编辑");
menu3=new JMenu("格式");
menu4=new JMenu("帮助");
menu2=new JPopupMenu();
itemOpen=new JMenuItem("打开");
itemSave=new JMenuItem("保存");
itemExit=new JMenuItem("退出");
itemSave2=new JMenuItem("另存为");
itemCopy=new JMenuItem("复制");
itemCut=new JMenuItem("剪切");
itemPaste=new JMenuItem("粘贴");
itemQuanxuan=new JMenuItem("全选");
itemPCopy=new JMenuItem("复制");
itemPCut=new JMenuItem("剪切");
itemPPaste=new JMenuItem("粘贴");
itemPQuanxuan=new JMenuItem("全选");
itemHang=new JCheckBoxMenuItem("自动换行");
itemZi=new JMenuItem("字体");
itemGuanyu=new JMenuItem("关于记事本");
itemOpen.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O,InputEvent.CTRL_MASK));
itemSave.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S,InputEvent.CTRL_MASK));
itemCopy.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_C,InputEvent.CTRL_MASK));
itemCut.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_X,InputEvent.CTRL_MASK));
itemPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));
itemPaste.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_V,InputEvent.CTRL_MASK));
itemQuanxuan.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_A,InputEvent.CTRL_MASK));
menu.add(itemOpen);
menu.addSeparator();
menu.add(itemSave);
menu.addSeparator();
menu.add(itemSave2);
menu.addSeparator();
menu.add(itemExit);
menubar.add(menu);
setJMenuBar(menubar);
menu1.add(itemCopy);
menu1.addSeparator();
menu1.add(itemCut);
menu1.addSeparator();
menu1.add(itemPaste);
menu1.addSeparator();
menu1.add(itemQuanxuan);
menubar.add(menu1);
setJMenuBar(menubar);
menu2.add(itemPCopy);
menu2.addSeparator();
menu2.add(itemPCut);
menu2.addSeparator();
menu2.add(itemPPaste);
menu2.addSeparator();
menu2.add(itemPQuanxuan);
menu3.add(itemHang);
menu3.addSeparator();
menu3.add(itemZi);
menubar.add(menu3);
menu4.add(itemGuanyu);
menubar.add(menu4);
setJMenuBar(menubar);
add(text);
text.addMouseListener(new MouseAdapter(){
public void mousePressed(MouseEvent e){
if(e.getModifiers()==InputEvent.BUTTON3_MASK)
menu2.show(text,e.getX(),e.getY());
}
});
add(new JScrollPane(text),BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
itemOpen.addActionListener(this);
itemExit.addActionListener(this);
itemSave.addActionListener(this);
itemSave2.addActionListener(this);
itemCopy.addActionListener(this);
itemCut.addActionListener(this);
itemPaste.addActionListener(this);
itemQuanxuan.addActionListener(this);
itemPQuanxuan.addActionListener(this);
itemPCopy.addActionListener(this);
itemPCut.addActionListener(this);
itemPPaste.addActionListener(this);
itemPQuanxuan.addActionListener(this);
itemHang.addActionListener(this);
itemZi.addActionListener(this);
itemGuanyu.addActionListener(this);
setVisible(true);
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==itemCopy||e.getSource()==itemPCopy)
text.copy();
else if(e.getSource()==itemCut||e.getSource()==itemPCut)
text.cut();
else if(e.getSource()==itemPaste||e.getSource()==itemPPaste)
text.paste();
else if(e.getSource()==itemQuanxuan||e.getSource()==itemPQuanxuan){
int end=text.getText().length();
text.setSelectionStart(0);
text.setSelectionEnd(end);
}
else if(e.getSource()==itemOpen){
JFileChooser chooser=new JFileChooser("D:/");
int n=chooser.showOpenDialog(null);
if(n==JFileChooser.APPROVE_OPTION){
File file=chooser.getSelectedFile();
try{ FileReader readfile=new FileReader(file);
BufferedReader in=new BufferedReader(readfile);
String s=null;
while((s=in.readLine())!=null)
text.append(s+"\n");
}
catch(IOException ee){}
}
}
else if(e.getSource()==itemSave||e.getSource()==itemSave2){
JFileChooser chooser=new JFileChooser("D:/");
int n=chooser.showSaveDialog(text);
if(n==JFileChooser.APPROVE_OPTION){
try {File file=chooser.getSelectedFile();
FileWriter tofile=new FileWriter(file + ".txt");
BufferedWriter out = new BufferedWriter(tofile);
out.write(text.getText());
out.flush();
out.close(); }
catch (IOException ee){}
}
}
else if(e.getSource()==itemExit)
System.exit(0);
else if(e.getSource()==itemHang){
if(itemHang.isSelected())
text.setLineWrap(true);
else
text.setLineWrap(false);
}
else if(e.getSource()==itemZi){
class dialog extends JDialog implements ItemListener,ActionListener{
JComboBox list;
JTextArea text;
Font font;
JButton yes,cancel;
JComponent com;
JTextArea textzi;
dialog(JComponent com){
setModal(true);
yes=new JButton("Yes");
cancel=new JButton("cancel");
yes.addActionListener(this);
cancel.addActionListener(this);
textzi=new JTextArea(2,25);
GraphicsEnvironment ge=GraphicsEnvironment.getLocalGraphicsEnvironment();
String fontName[]=ge.getAvailableFontFamilyNames();
list=new JComboBox();
for(int i=0;i<fontName.length;i++)
list.addItem(fontName[i]);
list.addItemListener(this);
Container con=getContentPane();
con.setLayout(new FlowLayout());
Box boxH1=Box.createHorizontalBox(),
boxH2=Box.createHorizontalBox(),
boxH3=Box.createHorizontalBox();
Box boxBase=Box.createVerticalBox();
boxH1.add(list);
boxH2.add(text);
boxH3.add(yes);
boxH3.add(cancel);
boxBase.add(boxH1);
boxBase.add(boxH2);
boxBase.add(boxH3);
con.add(boxBase);
setBounds(100,100,280,170);
validate();
}
public void itemStateChanged(ItemEvent e){
String name=(String)list.getSelectedItem();
font=new Font(name,Font.PLAIN,14);
textzi.setFont(font);
textzi.setText("字体预览");
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==yes){
com.setFont(font);
setVisible(false);
}
else if(e.getSource()==cancel){
setVisible(false);
}
}
}
Dialog dialog=new JDialog();
dialog.setVisible(true);
}
else if(e.getSource()==itemGuanyu){
JLabel lab1,lab2,lab3;
Dialog dialog=new JDialog();
dialog.setTitle("关于记事本");
dialog.setBounds(200,200,250,150);
dialog.setModal(true);
dialog.setLayout(new GridLayout(3, 1));
lab1 = new JLabel("记事本版本");
lab2 = new JLabel("NQ1.0");
lab3 = new JLabel(" 2012.11");
lab1.setHorizontalAlignment(JLabel.CENTER);
lab2.setHorizontalAlignment(JLabel.CENTER);
lab3.setHorizontalAlignment(JLabel.CENTER);
dialog.add(lab1);
dialog.add(lab2);
dialog.add(lab3);
dialog.setVisible(true);
}
}
}
