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java记事本代码解读 java记事本代码讲解
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java简单记事本源代码 带解释
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
class test implements ActionListener
{
JFrame frame;
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26,b27,b28,b29,b30,b31;
JTextArea ta;
JPanel p1,p2,p3,p4;
JMenuBar mb;
JMenu m1,m2,m3;
JMenuItem mt1,mt2,mt3,mt4,mt5,mt6,mt7;
JRadioButton rb1,rb2;
ButtonGroup bg;
Double d1=0.0,d2=0.0,d3=0.0,d4=1.0,d5=1.0;
String s1="",s2="",s3="",s4="";
int a=0;
char c1;
int i=0;
public static void main(String[] args)
{
test that=new test();
that.go();
}
public void go()
{
frame=new JFrame("计算器");
Container cp= frame.getContentPane();
cp.setLayout(new FlowLayout());
b1=new JButton("7");b2=new JButton("8");b3=new JButton("9");b4=new JButton("/");b5=new JButton("1/x");b6=new JButton("sin");b7=new JButton("log");
b8=new JButton("4");b9=new JButton("5");b10=new JButton("6");b11=new JButton("*");b12=new JButton("x^y");b13=new JButton("cos");b14=new JButton("ln");
b15=new JButton("1");b16=new JButton("2");b17=new JButton("3");b18=new JButton("-");b19=new JButton(new ImageIcon("lanying.gif"));b20=new JButton("tan");b21=new JButton("x^3");
b22=new JButton("0");b23=new JButton("+/-");b24=new JButton(".");b25=new JButton("+");b26=new JButton("√x");b27=new JButton("cot");b28=new JButton("x^2");
b29=new JButton("Backspace");b30=new JButton("C");b31=new JButton("=");
mb=new JMenuBar();
m1=new JMenu("文件(F)");m2=new JMenu("编辑(E)");m3=new JMenu("帮助(H)");
mt1=new JMenuItem("清零");mt2=new JMenuItem("退出");mt3=new JMenuItem("复制");mt4=new JMenuItem("粘贴");mt5=new JMenuItem("版本");mt6=new JMenuItem("标准型");mt7=new JMenuItem("科学型");
ta=new JTextArea(1,30);
p1=new JPanel();p2=new JPanel();p3=new JPanel();p4=new JPanel();
rb1=new JRadioButton("科学型");rb2=new JRadioButton("标准型");
bg=new ButtonGroup();
b1.setForeground(Color.blue);b1.setBackground(Color.white);b2.setForeground(Color.blue);b2.setBackground(Color.white);
b3.setForeground(Color.blue);b3.setBackground(Color.white);b8.setForeground(Color.blue);b8.setBackground(Color.white);
b9.setForeground(Color.blue);b9.setBackground(Color.white);b10.setForeground(Color.blue);b10.setBackground(Color.white);
b15.setForeground(Color.blue);b15.setBackground(Color.white);b16.setForeground(Color.blue);b16.setBackground(Color.white);
b17.setForeground(Color.blue);b17.setBackground(Color.white);b22.setForeground(Color.blue);b22.setBackground(Color.white);
b23.setForeground(Color.blue);b23.setBackground(Color.white);b24.setForeground(Color.blue);b24.setBackground(Color.white);
b4.setForeground(Color.red);b4.setBackground(Color.white);b11.setForeground(Color.red);b11.setBackground(Color.white);
b18.setForeground(Color.red);b18.setBackground(Color.white);b25.setForeground(Color.red);b25.setBackground(Color.white);
b5.setForeground(Color.blue);b5.setBackground(Color.white);b6.setForeground(Color.blue);b6.setBackground(Color.white);
b7.setForeground(Color.blue);b7.setBackground(Color.white);b12.setForeground(Color.blue);b12.setBackground(Color.white);
b13.setForeground(Color.blue);b13.setBackground(Color.white);b14.setForeground(Color.blue);b14.setBackground(Color.white);
b19.setForeground(Color.blue);b19.setBackground(Color.white);b20.setForeground(Color.blue);b20.setBackground(Color.white);
b21.setForeground(Color.blue);b21.setBackground(Color.white);b26.setForeground(Color.blue);b26.setBackground(Color.white);
b27.setForeground(Color.blue);b27.setBackground(Color.white);b28.setForeground(Color.blue);b28.setBackground(Color.white);
b29.setForeground(Color.red);b29.setBackground(Color.white);b30.setForeground(Color.red);b30.setBackground(Color.white);
b31.setForeground(Color.red);b31.setBackground(Color.white);
bg.add(rb1);bg.add(rb2);
p1.setBackground(Color.yellow);
cp.setBackground(Color.CYAN);
m1.setMnemonic(KeyEvent.VK_F);m2.setMnemonic(KeyEvent.VK_E);m3.setMnemonic(KeyEvent.VK_H);
m1.add(mt6);m1.add(mt7);m1.addSeparator();m1.add(mt1);m1.addSeparator();m1.add(mt2);m2.add(mt3);m2.addSeparator();m2.add(mt4);m3.add(mt5);
mb.add(m1);mb.add(m2);mb.add(m3);
frame.setJMenuBar(mb);
p2.setLayout(new GridLayout(4,7));
p3.setLayout(new GridLayout(1,3));
ta.setEditable(false);
p1.add(ta);
p2.add(b1);p2.add(b2);p2.add(b3);p2.add(b4);p2.add(b5);p2.add(b6);p2.add(b7);
p2.add(b8);p2.add(b9);p2.add(b10);p2.add(b11);p2.add(b12);p2.add(b13);p2.add(b14);
p2.add(b15);p2.add(b16);p2.add(b17);p2.add(b18);p2.add(b19);p2.add(b20);p2.add(b21);
p2.add(b22);p2.add(b23);p2.add(b24);p2.add(b25);p2.add(b26);p2.add(b27);p2.add(b28);
p3.add(b29);p3.add(b30);p3.add(b31);
Border etched=BorderFactory.createEtchedBorder();
Border border=BorderFactory.createTitledBorder(etched,"计算类型");
p4.add(rb1);p4.add(rb2);
p4.setBorder(border);
b2.setActionCommand("8");
b2.addActionListener(this);
cp.add(p1);cp.add(p4);cp.add(p2);cp.add(p3);
frame.setSize(400,330);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
b1.setActionCommand("7");
b1.addActionListener(this);
b2.setActionCommand("8");
b2.addActionListener(this);
b3.setActionCommand("9");
b3.addActionListener(this);
b4.setActionCommand("/");
b4.addActionListener(this);
b5.setActionCommand("1/x");
b5.addActionListener(this);
b6.setActionCommand("sin");
b6.addActionListener(this);
b7.setActionCommand("log");
b7.addActionListener(this);
b8.setActionCommand("4");
b8.addActionListener(this);
b9.setActionCommand("5");
b9.addActionListener(this);
b10.setActionCommand("6");
b10.addActionListener(this);
b11.setActionCommand("*");
b11.addActionListener(this);
b12.setActionCommand("x^y");
b12.addActionListener(this);
b13.setActionCommand("cos");
b13.addActionListener(this);
b14.setActionCommand("ln");
b14.addActionListener(this);
b15.setActionCommand("1");
b15.addActionListener(this);
b16.setActionCommand("2");
b16.addActionListener(this);
b17.setActionCommand("3");
b17.addActionListener(this);
b18.setActionCommand("-");
b18.addActionListener(this);
b19.setActionCommand("x!");
b19.addActionListener(this);
b20.setActionCommand("tan");
b20.addActionListener(this);
b21.setActionCommand("x^3");
b21.addActionListener(this);
b22.setActionCommand("0");
b22.addActionListener(this);
b23.setActionCommand("+/-");
b23.addActionListener(this);
b24.setActionCommand(".");
b24.addActionListener(this);
b25.setActionCommand("+");
b25.addActionListener(this);
b26.setActionCommand("√x");
b26.addActionListener(this);
b27.setActionCommand("cot");
b27.addActionListener(this);
b28.setActionCommand("x^2");
b28.addActionListener(this);
b29.setActionCommand("Backspace");
b29.addActionListener(this);
b30.setActionCommand("C");
b30.addActionListener(this);
b31.setActionCommand("=");
b31.addActionListener(this);
rb1.setActionCommand("kxx");
rb1.addActionListener(this);
rb2.setActionCommand("bzx");
rb2.addActionListener(this);
}
public void actionPerformed(ActionEvent e) //throws Exception
{
if (e.getActionCommand()=="bzx")
{
b5.setEnabled(false);b6.setEnabled(false);b7.setEnabled(false);
b12.setEnabled(false);b13.setEnabled(false);b14.setEnabled(false);
b19.setEnabled(false);b20.setEnabled(false);b21.setEnabled(false);
b26.setEnabled(false);b27.setEnabled(false);b28.setEnabled(false);
}
if (e.getActionCommand()=="kxx")
{
b5.setEnabled(true);b6.setEnabled(true);b7.setEnabled(true);
b12.setEnabled(true);b13.setEnabled(true);b14.setEnabled(true);
b19.setEnabled(true);b20.setEnabled(true);b21.setEnabled(true);
b26.setEnabled(true);b27.setEnabled(true);b28.setEnabled(true);
}
if (e.getActionCommand()=="1")
{
ta.append("1");
}
if (e.getActionCommand()=="2")
{
ta.append("2");
}
if (e.getActionCommand()=="3")
{
ta.append("3");
}
if (e.getActionCommand()=="4")
{
ta.append("4");
}
if (e.getActionCommand()=="5")
{
ta.append("5");
}
if (e.getActionCommand()=="6")
{
ta.append("6");
}
if (e.getActionCommand()=="7")
{
ta.append("7");
}
if (e.getActionCommand()=="8")
{
ta.append("8");
}
if (e.getActionCommand()=="9")
{
ta.append("9");
}
if (e.getActionCommand()=="0")
{
ta.append("0");
}
if (e.getActionCommand()=="+")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=1;
}
if (e.getActionCommand()=="-")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=2;
}
if (e.getActionCommand()=="*")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=3;
}
if (e.getActionCommand()=="/")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=4;
}
if (e.getActionCommand()=="=")
{
s2=ta.getText();
d2=Double.parseDouble(s2);
if(i==1)
{
d3=d1+d2;
ta.setText( d3.toString());
}
if(i==2)
{
d3=d1-d2;
ta.setText( d3.toString());
}
if(i==3)
{
d3=d1*d2;
ta.setText( d3.toString());
}
if(i==4)
{
if(d2==0.0)
ta.setText("ERROR");
else
{
d3=d1/d2;
ta.setText( d3.toString());
}
}
if (i==5)
{
s2=ta.getText();
d2 = Double.parseDouble(s2);
for (int l=1;l=d2 ; l++)
{
d5=d5*d1;
}
ta.setText( d5.toString());
}
}
if (e.getActionCommand()=="C")
{
ta.setText("");
d4=1.0;
d5=1.0;
}
/*if (e.getActionCommand()=="Backspace")
{
s3=ta.getText();
a=s3.length();
//ta.cut(ta.select(a-1,a));
s4=ta.getText(1,3);
ta.setText(s4);
}
*/
if (e.getActionCommand()=="1/x")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=1/d1;
ta.setText( d2.toString());
}
if (e.getActionCommand()==".")
{
ta.append(".");
}
if (e.getActionCommand()=="+/-")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=0-d1;
ta.setText( d2.toString());
}
if (e.getActionCommand()=="x^2")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=d1*d1;
ta.setText( d2.toString());
}
if (e.getActionCommand()=="x^3")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=d1*d1*d1;
ta.setText( d2.toString());
}
if (e.getActionCommand()=="x^y")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
ta.setText("");
i=5;
// d2=d1*d1*d1;
// ta.setText( d2.toString());
}
if (e.getActionCommand()=="√x")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=Math.sqrt(d1);
ta.setText( d2.toString());
}
if (e.getActionCommand()=="x!")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
if (d10)
{
ta.setText( "error");
}
else if (d1==0)
{
ta.setText( "0.0");
}
else {
for (int k=1;k=d1 ;k++ )
d4=d4*k;
ta.setText( d4.toString());
}
}
if (e.getActionCommand()=="sin")
{
s1=ta.getText();
d1 = Double.parseDouble(s1);
d2=Math.sin(3.1415926*d1/180);
ta.setText( d2.toString());
}
}
}
相关问答
Q1: JAVA记事本代码，老师让做成ppt讲解，求大神指出里面的重点和需要讲解的地方，最好详细点
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import javax.swing.*;
public class MyNotepad implements ActionListener{
private JFrame frame=new JFrame("新记事本");
private JTextArea jta=new JTextArea();
private String result="";
private boolean flag=true;
private File f;
private JButton jb=new JButton("开始");
private JTextField jtf=new JTextField(15);
private JTextField jt=new JTextField(15);
private JButton jbt=new JButton("替换为");
private JButton jba=new JButton("全部替换");
private Icon ic=new ImageIcon("D:\\java课堂笔记\\GUI\\11.gif");
private String value;
private int start=0;
private JFrame jf=new JFrame("查找");
private JFrame jfc=new JFrame("替换");
@Override
public void actionPerformed(ActionEvent e) {
String comm=e.getActionCommand();
if("新建".equals(comm)){
if(!(frame.getTitle().equals("新记事本"))){
if(!flag){
write();
newNew();
}else{
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
write();
}
}
}else if(!(jta.getText().isEmpty())){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
write();
newNew();
}
}else{
newNew();
}
}else if("打开".equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
jfc.setDialogType(JFileChooser.OPEN_DIALOG);
int returnVal = jfc.showOpenDialog(null);
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
frame.setTitle(f.getName());
result=read();
flag=false;
value=result;
jta.setText(result);
}
}else if("保存".equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
if(flag){
int returnVal = jfc.showDialog(null,"保存为");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
flag=false;
write();
}
}else{
write();
}
}else if("另存".equals(comm)){
JFileChooser jfc=new JFileChooser("D:\\java课堂笔记");
int returnVal = jfc.showDialog(null,"另存");
if(returnVal == JFileChooser.APPROVE_OPTION) {//选择文件后再执行下面的语句，保证了程序的健壮性
f=jfc.getSelectedFile();
write();
}
}else if("退出".equals(comm)){
System.exit(0);
}else if("撤销".equals(comm)){
jta.setText(value);
}else if("剪切".equals(comm)){
value=jta.getText();
jta.cut();
}else if("复制".equals(comm)){
jta.copy();
}else if("粘贴".equals(comm)){
value=jta.getText();
jta.paste();
}else if("删除".equals(comm)){
value=jta.getText();
jta.replaceSelection(null);
}else if("全选".equals(comm)){
jta.selectAll();
}else if("查找".equals(comm)){
value=jta.getText();
jf.add(jtf,BorderLayout.CENTER);
jf.add(jb,BorderLayout.SOUTH);
jf.setLocation(300,300);
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("替换".equals(comm)){
value=jta.getText();
GridLayout gl=new GridLayout(3,3);
JLabel jl1=new JLabel("查找内容:");
JLabel jl2=new JLabel("替换为:");
jfc.setLayout(gl);
jfc.add(jl1);
jfc.add(jtf);
jfc.add(jb);
jfc.add(jl2);
jfc.add(jt);
jfc.add(jbt);
JLabel jl3=new JLabel();
JLabel jl4=new JLabel();
jfc.add(jl3);
jfc.add(jl4);
jfc.add(jba);
jfc.setLocation(300,300);
jfc.pack();
jfc.setVisible(true);
jfc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}else if("版本".equals(comm)){
JDialog jd=new JDialog(frame,"关于对话框");
jd.setSize(200,200);
JLabel l=new JLabel("哈哈哈哈哈哈哈哈哈哈呵呵呵呵呵呵呵呵呵呵呵呵呵");
jd.add(l,BorderLayout.CENTER);
jd.setLocation(100,200);
jd.setSize(300,300);
jd.setVisible(true);
// jd.pack();
jd.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
}else if("开始".equals(comm)||"下一个".equals(comm)){
String temp=jtf.getText();
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){
jta.setSelectionStart(s);
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);
start=s+1;
jb.setText("下一个");
// value=value.substring(s+temp.length());//不能截取字串
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
}else if("替换为".equals(comm)){
String temp=jtf.getText();
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){
jta.setSelectionStart(s);
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);
start=s+1;
jta.replaceSelection(jt.getText());
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
}else if("全部替换".equals(comm)){
String temp=jta.getText();
temp=temp.replaceAll(jtf.getText(), jt.getText());
jta.setText(temp);
}
}
public String read(){
String temp="";
try {
FileInputStream fis = new FileInputStream(f.getAbsolutePath());
byte[] b=new byte[1024];
while(true){
int num=fis.read(b);
if(num==-1)break;
temp=temp+new String(b,0,num);
}
fis.close();
} catch (Exception e1) {
e1.printStackTrace();
}
return temp;
}
public void write(){
try {
FileOutputStream fos=new FileOutputStream(f);
fos.write(jta.getText().getBytes());
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void newNew(){
frame.dispose();
new MyNotepad();
flag=true;
}
public MyNotepad(){
JMenuBar jmb=new JMenuBar();
String[] menuLab={"文件","编辑","帮助"};
String[][] menuItemLab={{"新建","打开","保存","另存","退出"},
{"撤销","剪切","复制","粘贴","删除","全选","查找","替换"},
{"版本"}};
for(int i=0;imenuLab.length;i++){
JMenu menu=new JMenu(menuLab[i]);
jmb.add(menu);
for(int j=0;jmenuItemLab[i].length;j++){
JMenuItem jmi=new JMenuItem(menuItemLab[i][j]);
menu.add(jmi);
jmi.addActionListener(this);
}
}
frame.setJMenuBar(jmb);
jta.setLineWrap(true);//自动换行
JScrollPane jsp=new JScrollPane(jta);//滚动窗口面板
frame.add(jsp);
jb.addActionListener(this);
jbt.addActionListener(this);
jba.addActionListener(this);
frame.setLocation(200,50);
frame.setSize(620,660);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
new MyNotepad();
}
}
Q2: 百度知道谁可以帮我注释一段Java记事本代码谢谢了！事成之后有重谢！！！
else if("开始".equals(comm)||"下一个".equals(comm)){//点击java记事本代码解读的按钮为开始或下一个
String temp=jtf.getText();//取得输入框的内容
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){//判断输入框的内容是否在记事本中存在
jta.setSelectionStart(s);//选中查找的内容
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);//使选中的内容高亮
start=s+1;
jb.setText("下一个");
// value=value.substring(s+temp.length());//不能截取字串
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
}else if("替换为".equals(comm)){//跟上面差不多
String temp=jtf.getText();
int s=value.indexOf(temp,start);
if(value.indexOf(temp,start)!=-1){
jta.setSelectionStart(s);
jta.setSelectionEnd(s+temp.length());
jta.setSelectedTextColor(Color.GREEN);//使选中的内容高亮
start=s+1;
jta.replaceSelection(jt.getText());//替换选中的内容
}else {
JOptionPane.showMessageDialog(jf, "查找完毕!", "提示", 0, ic);
jf.dispose();
}
}else if("全部替换".equals(comm)){
String temp=jta.getText();
temp=temp.replaceAll(jtf.getText(), jt.getText());
jta.setText(temp);
}
好java记事本代码解读了。你在看看把。
Q3: java记事本代码谁能解释一下？ if（!（frame.getTitle（）.equals（“记事本”
自己写的java记事本代码解读，有问题可以hi：
import java.awt.BorderLayout;
import java.awt.FileDialog;
import java.awt.Font;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.border.TitledBorder;
/*因为根据个人的电脑路径可能有所偏差java记事本代码解读，没有源路径的情况下，设置默认保存路径为D盘根目录下
* 若要选择保存其java记事本代码解读他地方，可以选择 另存为*/
public class TestDemo extends JFrame {
private static final long serialVersionUID = -5355432125621015300L;
private String url = null;//文件路径
private String str=null;//复制或剪切 的字符串
private StringSelection stringSelection=null;
private Clipboard clipboard=new Clipboard(str);
private Transferable transferable=null;
private DataFlavor flavor=null;
public TestDemo() {
init();
}
private void init() {
setTitle("java记事本代码解读我的记事本");
setSize(500, 600);
setContentPane(createContentPane());//添加主面板
}
/*创建主面板*/
private JPanel createContentPane() {
JPanel pane = new JPanel(new BorderLayout());
pane.add(BorderLayout.NORTH, createChocePane());//添加菜单栏
pane.add(createAreaPane());//添加文本编辑区域
return pane;
}
/*创建菜单栏，以及实现功能*/
private JPanel createChocePane() {
JPanel pane = new JPanel();
JMenuBar menuBar1 = new JMenuBar();
JMenu menu = new JMenu("文件");
menuBar1.add(menu);
JMenuItem menuIt1 = new JMenuItem("新建");
JMenuItem menuIt2 = new JMenuItem("打开");
JMenuItem menuIt3 = new JMenuItem("保存");
JMenuItem menuIt4 = new JMenuItem("另存为");
menu.add(menuIt1);
menu.add(menuIt2);
menu.add(menuIt3);
menu.add(menuIt4);
JMenuBar menuBar2 = new JMenuBar();
JMenu menu2 = new JMenu("编辑");
menuBar2.add(menu2);
JMenuItem menuIt5 = new JMenuItem("复制");
JMenuItem menuIt6 = new JMenuItem("剪切");
JMenuItem menuIt7 = new JMenuItem("粘帖");
menu2.add(menuIt5);
menu2.add(menuIt6);
menu2.add(menuIt7);
JMenuBar menuBar3 = new JMenuBar();
JMenu menu3 = new JMenu("帮助");
menuBar3.add(menu3);
JMenuItem menuIt8 = new JMenuItem("关于记事本");
menu3.add(menuIt8);
pane.add(menuBar1);
pane.add(menuBar2);
pane.add(menuBar3);
menuIt1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
testArea.setText(null);
}
});
menuIt2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
final FileDialog fd = new FileDialog(new JFrame(), "查找文件",
FileDialog.LOAD);
fd.setVisible(true);
if (fd.getDirectory() != null fd.getFile() != null) {
testArea.setText(null);
url = fd.getDirectory() + fd.getFile();
try {
BufferedReader in = new BufferedReader(new FileReader(
url));
for (int i = 0;; i++) {
testArea.append(in.readLine());
if (in.read() == -1) {
break;
} else
continue;
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
});
menuIt3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (url==null) {
url="D:\\新建 文本文档.txt";
}
File f = new File(url);
BufferedWriter out = null;
try {
out = new BufferedWriter(new FileWriter(url));
f.createNewFile();
out.append(testArea.getText());
out.flush();
} catch (IOException e1) {
e1.printStackTrace();
} finally {
try {
out.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
});
menuIt4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
FileDialog fd = new FileDialog(new JFrame(), "保存文本",
FileDialog.SAVE);
fd.setVisible(true);
if (url!=null) {
File f = new File(url);
BufferedWriter out = null;
try {
f.createNewFile();
out = new BufferedWriter(new FileWriter(url));
out.append(testArea.getText());
out.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
});
menuIt5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
str=testArea.getSelectedText();
stringSelection=new StringSelection(str);
clipboard.setContents(stringSelection, null);
}
});
menuIt6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
str=testArea.getSelectedText();
stringSelection=new StringSelection(str);
clipboard.setContents(stringSelection, null);
int start=testArea.getSelectionStart();
int end=testArea.getSelectionEnd();
testArea.replaceRange( null,start,end);
}
});
menuIt7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
transferable=clipboard.getContents(this);
flavor=DataFlavor.stringFlavor;
if (transferable.isDataFlavorSupported(flavor)) {
int start=testArea.getSelectionStart();
int end=testArea.getSelectionEnd();
testArea.replaceRange( null,start,end);
int pos=testArea.getCaretPosition();
try {
str=(String)transferable.getTransferData(flavor);
testArea.insert(str, pos);
} catch (UnsupportedFlavorException e1) {
e1.printStackTrace();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
});
menuIt8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog(null,"功能简单，绝对原创 ");
}
});
return pane;
}
JTextArea testArea;
private JScrollPane createAreaPane() {
JScrollPane pane = new JScrollPane();
pane.setBorder(new TitledBorder("编辑区域"));
testArea = new JTextArea();
testArea.setFont(new Font("宋体", Font.BOLD, 13));
testArea.setLineWrap(true);
pane.getViewport().add(testArea);
return pane;
}
public static void main(String[] args) {
TestDemo td = new TestDemo();
td.setVisible(true);
}
}
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