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给你个做好了的Java的源程序的记事本，自己看看就行了的，不怎么难的···
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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();
}
}
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import java.awt.image.*;
import java.awt.geom.*;
import java.util.*;
class Car{
Image img;
int x, y;
Dimension dim;
Car(Image img){
this.img=img;
}
Car(Image img, int x, int y){
this.img=img; this.x=x; this.y=y;
}
Car(Image img, int x, int y, Dimension dim){
this(img, x, y);
this.dim=dim;
}
void draw(Graphics g, ImageObserver observer){
g.drawImage(img, x, y, observer);
}
int getX(){ return x;}
int getY(){ return y;}
void setX(int x){this.x=x;}
void setY(int y){this.y=y;}
void setLocation(int x, int y){
this.x=x; this.y=y;
}
int getWidth(){ return img.getWidth(null);}
int getHeight(){ return img.getHeight(null);}
Rectangle2D getRectangle(){
return new Rectangle2D.Float(x, y, getWidth(), getHeight());
}
void move(int dx, int dy){
x+=dx;
y+=dy;
if(dim!=null){
if(x0)x=0;
if(x+getWidth()dim.getWidth())
x=(int)dim.getWidth()-getWidth();
}
}
boolean intersects(Car car){
return getRectangle().intersects(car.getRectangle());
}
boolean intersects(int x, int y){
return getRectangle().intersects(x, y, getWidth(), getHeight());
}
}
public class CarRace extends Applet implements KeyListener, Runnable{
Image buff;
Canvas screen;
Graphics2D gs, gb;
Car redCar;
Car[] enemy=new Car[20];
Button bStart;
Thread game;
boolean loop=true;
Dimension dim=new Dimension(200, 300);
int road;
Random rnd=new Random();
public void init(){
prepareResource();
setBackground(Color.blue);
initScreen();
add(screen);
bStart=new Button("霸烙 矫累");
add(bStart);
bStart.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
screen.requestFocus();
if(!game.isAlive())
game.start();
}
});
}
void prepareResource(){
Image imgRed=getImage(getCodeBase(),"images/red_car.gif");
Image imgBlue=getImage(getCodeBase(),"images/blue_car.gif");
Image imgGreen=getImage(getCodeBase(),"images/green_car.gif");
MediaTracker mt=new MediaTracker(this);
try{
mt.addImage(imgRed, 0);
mt.addImage(imgBlue, 1);
mt.addImage(imgGreen, 2);
mt.waitForAll();
}catch(Exception e){}
buff=createImage((int)dim.getWidth(), (int)dim.getHeight());
gb=(Graphics2D)buff.getGraphics();
redCar=new Car(imgRed, 80,250, dim);
for(int i=0;i10;i++){
enemy[i]=new Car(imgBlue, 0, 0);
}
for(int i=10;ienemy.length;i++){
enemy[i]=new Car(imgGreen, 0, 0);
}
for(int i=0;ienemy.length;i++){
setEnemy(i);
}
game=new Thread(this);
}
public void stop(){
loop=false;
}
public void run(){
while(loop){
drawScreen();
try{ Thread.sleep(50);}catch(Exception e){}
}
}
void initScreen(){
screen=new Canvas(){
public void paint(Graphics g){
if(gs==null){
gs=(Graphics2D)screen.getGraphics();
}
drawScreen();
}
};
screen.setSize(dim);
screen.addKeyListener(this);
}
void setEnemy(int en){
int x, y;
next:while(true){
x=rnd.nextInt((int)dim.getWidth()-enemy[en].getWidth());
y=-rnd.nextInt(5000)-200;
for(int j=0;jenemy.length;j++){
if(j!=en enemy[j].intersects(x, y))continue next;
}
enemy[en].setLocation(x, y);
break;
}
}
void check(Car en){
if(redCar.intersects(en)){
if(redCar.getX()en.getX()){
en.move(-20, 0);
redCar.move(20, 0);
}
else{
en.move(20,0);
redCar.move(-20, 0);
}
}
}
synchronized void drawScreen(){
gb.clearRect(0, 0, (int)dim.getWidth(), (int)dim.getHeight());
gb.setPaint(new Color(100, 100, 100));
gb.fillRect(0, 0, (int)dim.getWidth(), (int)dim.getHeight());
drawRoad();
for(int i=0;ienemy.length;i++){
enemy[i].move(0, 15);
enemy[i].draw(gb, screen);
if(enemy[i].getY()dim.getHeight())
setEnemy(i);
check(enemy[i]);
}
redCar.draw(gb, screen);
gs.drawImage(buff, 0,0, screen);
}
void drawRoad(){
road+=80;
gb.setPaint(Color.yellow);
gb.fillRect((int)dim.getWidth()/2, road,10,150);
if(road=dim.getHeight())road=-150;
}
public void keyPressed(KeyEvent ke){
if(ke.getKeyCode()==KeyEvent.VK_LEFT){
redCar.move(-10,0);
}
else if(ke.getKeyCode()==KeyEvent.VK_RIGHT){
redCar.move(10,0);
}
}
public void keyReleased(KeyEvent ke){}
public void keyTyped(KeyEvent ke){}
}
这个是一个典型的Applet,文件名应该是CarRace.java,需要图片作为车子等等,本人也是别人给的,但是还要个.html文件来运行它,代码为:
Applet code="CarRace.class" width=250 height=350
/Applet
请楼主采纳
package com.test01;
import java.util.Scanner;
public class oop5 { public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
// int x = 9;
// int y = 1;
int x = sc.nextInt();
int y = sc.nextInt();
int z;
z = add(x, y);
System.out.println("x的值为：" + x);
System.out.println("y的值为：" + y);
System.out.println("二者之和为：" + z);
}
/** 四种小算法 */
// 加法运算
public static int add(int a, int b) {
int c;
c = a + b;
return c;
}
// 减法运算
public static int jian(int d, int v) {
int m;
m = d - v;
return m;
}
// 乘积运算
public static int addAdd(int q, int w) {
int e;
e = q * w;
return e;
}
// 除法运算
public static int chu(int p, int k) {
int f;
f = p / k;
return f;
}
}