.。。。。【松下加兵卫吧】

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
public class Car extends Frame
{
int x=80,y=80;
Image image; public void window() //生成窗口
{ try {
image = new ImageIcon(new URL("file:C:\\Documents and Settings\\Administrator\\桌面\\lesson5\\car.jpg")).getImage();
} catch (MalformedURLException ex) {
//Logger.getLogger(mCar.class.getName()).log(Level.SEVERE, null, ex);
}
setSize(600,500);
setVisible(true);
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e){
dispose();
System.exit(0);
}}
);
addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent e){
//******************************此行以下输入您的代码
if(e.getKeyCode()==KeyEvent.VK_UP)
y=y-10;
if(e.getKeyCode()==KeyEvent.VK_DOWN)
y=y+10;
if(e.getKeyCode()==KeyEvent.VK_RIGHT)
x=x+10;
if(e.getKeyCode()==KeyEvent.VK_LEFT)
x=x-10;
if(e.getKeyCode()==KeyEvent.VK_S)
{y=y-10;
x=x+10;}
//**********************************
repaint();
}
} ); }
public void paint(Graphics g)//在窗口中画图
{
g.drawImage(image, x, y, this);
}
public static void main(String[] args)//主方法，java的应用程序必须有且只有一个主方法
{
Car a=new Car();
a.window();
}
}I

送TA礼物

1楼2013-10-09 12:10回复

package prj24_1;
import java.util.Random; import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.lcdui.game.GameCanvas;
import javax.microedition.lcdui.game.Sprite; public class CarRaceCanvas extends GameCanvas implements CommandListener,Runnable { private Graphics gra;
/************************用户汽车和5种对手汽车*************************/
private Sprite myCar;
private Sprite[] enemy = new Sprite[5];
/************************命令按钮***********************************/
private Command cmdStart = new Command("开始游戏", Command.SCREEN, 1);
private Command cmdStop = new Command("暂停游戏", Command.SCREEN, 1);
/************************游戏线程***********************************/
private Thread game;
private boolean loop = true; private int road;
private Random rnd = new Random();
private int score = 100;
private Font font = null; public CarRaceCanvas() {
super(true);
this.prepareResource();
this.addCommand(cmdStart);
this.setCommandListener(this);
gra = this.getGraphics();
font = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_BOLD, Font.SIZE_LARGE);
} public void prepareResource() {
/************************载入图片***********************************/
try {
Image myImage = Image.createImage("/mycar.gif");
myCar = new Sprite(myImage);
for (int i = 0; i < enemy.length; i++) {
Image enImg = Image.createImage("/enemy.gif");
enemy[i] = new Sprite(enImg);
} } catch (Exception ex) {
ex.printStackTrace();
}
for (int i = 0; i < enemy.length; i++) {
setEnemy(i);
}
//将用户汽车画在界面正中央
myCar.setPosition((this.getWidth()-myCar.getWidth())/2,
(this.getHeight()-myCar.getHeight())/2);
}
//设定第en个对手汽车的随机位置
public void setEnemy(int en) {
int x, y;
while (true) {
x = rnd.nextInt((int) this.getWidth() - enemy[en].getWidth());
//取纵坐标为界面高度-10倍范围内的随机数
y = -rnd.nextInt(this.getHeight()*10);
for (int j = 0; j < enemy.length; j++) {
//不能让汽车和别的对手汽车重叠
if (j != en && enemy [j].collidesWith(enemy [en], true)){
continue;
}
}
enemy [en].setPosition(x, y);
break;
}
} public void commandAction(Command cmd, Displayable dis) {
if (cmd == cmdStart) {
loop = true;
game = new Thread(this);
game.start();
this.removeCommand(cmdStart);
this.addCommand(cmdStop);
} else if (cmd == cmdStop) {
loop = false;
game = null;
this.removeCommand(cmdStop);
this.addCommand(cmdStart);
}
} public void run() {
while (loop) {
drawScreen();
int state = this.getKeyStates();
switch(state){
case GameCanvas.LEFT_PRESSED:
myCar.move(-10, 0);
break;
case GameCanvas.RIGHT_PRESSED:
myCar.move(10, 0);
break;
case GameCanvas.UP_PRESSED:
myCar.move(0, -10);
break;
case GameCanvas.DOWN_PRESSED:
myCar.move(0, 10);
break;
}
try {
Thread.sleep(50);
} catch (Exception e) {
}
}
} public void drawScreen() {
//将界面背景用灰色清空
gra.setColor(120, 120, 120);
gra.fillRect(0, 0, this.getWidth(), this.getHeight());
//画道路
drawRoad();
//画出当前分数
gra.setColor(255,0,0);
gra.setFont(font);
gra.drawString("当前分数："+score, this.getWidth()/2, 0, Graphics.TOP|Graphics.HCENTER);
//对手车辆下移
for (int i = 0; i < enemy.length; i++) {
enemy[i].move(0, 15);
enemy[i].paint(gra);
if (enemy[i].getY() > this.getHeight()){
setEnemy(i);
}
//判断是否碰撞
check(enemy[i]);
}
myCar.paint(gra);
this.flushGraphics();
} public void drawRoad() {
road += 80;
//画道路中间的白线
gra.setColor(255, 255, 255);
gra.fillRect((int) this.getWidth()/2-10, road, 20, 150);
if (road >= this.getHeight()) {
road = -150;
}
} public void check(Sprite en) {
if (myCar.collidesWith(en, true)) {
score--;
//如果用户汽车左侧撞到对手汽车
if (myCar.getX() > en.getX()) {
en.move(-20, 0);
myCar.move(20, 0);
}
//如果用户汽车右侧撞到对手汽车
else {
en.move(20, 0);
myCar.move(-20, 0);
}
}
if(score==0){
loop = false;
game = null;
//将界面背景用灰色清空
gra.setColor(120, 120, 120);
gra.fillRect(0, 0, this.getWidth(), this.getHeight());
gra.setColor(255,0,0);
gra.setFont(font);
gra.drawString("您输了", this.getWidth()/2, 0, Graphics.TOP|Graphics.HCENTER);
this.removeCommand(cmdStart);
this.removeCommand(cmdStop);
}
}
}
I

4楼2013-10-09 12:14

import lejos.nxt.Motor;
import lejos.robotics.navigation.TachoPilot;
import lejos.util.Delay;
public class LALALA {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
TachoPilot s=new
TachoPilot(5.6f,16.0f,Motor.A,Motor.C,true);
s.setSpeed(500);//设置马达速度
s.forward();//前进
Delay.msDelay(1000);
s.backward();//后退
Delay.msDelay(1000);
s.rotate(90);//转向90度
s.travel(-60);//机器人后退60厘米
s.steer(50,360);//转圈，速度50，转圈360度
}
}

5楼2013-10-16 11:33

import lejos.nxt.SensorPort;
import lejos.nxt.SoundSensor;
import lejos.util.Delay;
public class Test {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
SoundSensor a=new SoundSensor(SensorPort.S1);
while(true)
{ System.out.println(a.readValue());
Delay.msDelay(1000);}
}
}

6楼2013-10-16 11:34

a是声音传感器；s是机器人

7楼2013-10-16 11:59

//package Caishu;
import java.util.Scanner;
public class Guess {
/**
* @param args
*/
public static void main(String[] args) {
int b = (int) (Math.random()*10+1);
Scanner input=new Scanner(System.in);
System.out.println("请输入1个10以内的数字：");
int a = input.nextInt();
int i=1;
while( a != b && i<10)
{
System.out.println(a>b?"大了":"小了");
System.out.println("请输入1个10以内的数字：");
a = input.nextInt();
i++;
}
String s = "";
if(i<2)
{
s="你猜对了，你是牛人";
}else if(i<5)
{
s="你猜对了，你的成绩不错";
}else s="10次都猜不中你是脑残";
System.out.println("结果是："+b+"你猜的次数为："+i+","+s);
}
}

10楼2013-10-23 12:06

import java.lang.*;
import java.awt.*;
import java.io.*;
import java.awt.datatransfer.*;
import java.awt.event.*;
import javax.swing.JColorChooser;
import javax.swing.JOptionPane;
public class NoteBook extends Frame implements ActionListener
{
private MenuItem filenew=new MenuItem("新建");
private MenuItem fileopen=new MenuItem("打开");
private MenuItem filesave=new MenuItem("保存");
private MenuItem fileexit=new MenuItem("退出");
private MenuItem editselectall=new MenuItem("全选");
private MenuItem editcopy=new MenuItem("复制");
private MenuItem editcut=new MenuItem("剪切");
private MenuItem editpaste=new MenuItem("粘贴");
private MenuItem color = new MenuItem("背景颜色");
private MenuItem about = new MenuItem("关于");
private TextArea area=new TextArea();
String fileName = null;
Toolkit toolKit=Toolkit.getDefaultToolkit();
Clipboard clipBoard=toolKit.getSystemClipboard();
private FileDialog openFileDialog= new FileDialog(this,"打开文件",FileDialog.LOAD);
private FileDialog saveAsFileDialog=new FileDialog(this,"文件存为",FileDialog.SAVE);
private class WindowCloser extends WindowAdapter
{
public void windowClosing(WindowEvent we)
{ System.exit(0);}
}
private void setup()
{
Menu file=new Menu("文件");
file.add(filenew); filenew.addActionListener(this);
file.add(fileopen); fileopen.addActionListener(this);
file.add(filesave); filesave.addActionListener(this);
file.addSeparator();
file.add(fileexit); fileexit.addActionListener(this);
Menu edit=new Menu("编辑");
edit.add(editselectall); editselectall.addActionListener(this);
edit.addSeparator();
edit.add(editcopy); editcopy.addActionListener(this);
edit.add(editcut); editcut.addActionListener(this);
edit.add(editpaste); editpaste.addActionListener(this);
Menu help=new Menu("帮助");
help.add(color); color.addActionListener(this);
help.addSeparator();
help.add(about); about.addActionListener(this);

12楼2013-10-23 12:11

收起回复

MenuBar bar=new MenuBar();
bar.add(file);
bar.add(edit);
bar.add(help);
setMenuBar(bar);
setLayout(new BorderLayout());
add("Center",area);
}
public NoteBook()
{
super("哈哈哈记事本");
setup();
addWindowListener(new WindowCloser());
setSize(400,500);
show();
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==filenew)
area.setText("");
if(e.getSource()==fileopen)
{
openFileDialog.show();
fileName=openFileDialog.getDirectory()+openFileDialog.getFile();
if(fileName != null)
readFile(fileName);
}
if(e.getSource()==filesave)
{
if(fileName != null)
writeFile(fileName);
}
if(e.getSource()==fileexit)
System.exit(0);
if(e.getSource()==editselectall)
area.selectAll();
if(e.getSource()==editcopy)
{
String text=area.getSelectedText();
StringSelection selection=new StringSelection(text);
clipBoard.setContents(selection,null);
}
if(e.getSource()==editcut)
{
String text=area.getSelectedText();
StringSelection selection=new StringSelection(text);
clipBoard.setContents(selection,null);
area.replaceRange("",area.getSelectionStart(),area.getSelectionEnd());
}
if(e.getSource()==editpaste)
{
Transferable contents=clipBoard.getContents(this);
if(contents==null) return;
String text;
text="";
try{
text=(String)contents.getTransferData(DataFlavor.stringFlavor);
}catch(Exception exception){
}
area.replaceRange(text,area.getSelectionStart(),area.getSelectionEnd());
}
if(e.getSource()==color)
{
Color ccc = JColorChooser.showDialog(this,"color",Color.BLACK);
area.setBackground(ccc);
}
if(e.getSource()==about)
{
JOptionPane.showMessageDialog(area,"本软件版权归郭培培所有");
}
}
public void readFile(String fileName)
{
area.setText("");
try{
BufferedReader in=new BufferedReader(new FileReader(fileName));
String line;
while((line=in.readLine())!=null)
area.append(line+"\n");
in.close();
area.setCaretPosition(0);
}catch(IOException e){
System.out.println("打开文件错误");
}
}
public void writeFile(String fileName)
{
try{
File file = new File (fileName);
FileWriter writeOut = new FileWriter(file);
writeOut.write(area.getText());
writeOut.close();
}catch(IOException e){
System.out.println("写文件错误");
}
}
public static void main(String srgs[])
{
NoteBook f=new NoteBook();
}
}

13楼2013-10-23 12:12

收起回复

import lejos.nxt.Motor;
import lejos.nxt.SensorPort;
import lejos.nxt.UltrasonicSensor;
import lejos.robotics.navigation.TachoPilot;
import lejos.util.Delay;
public class CREDO {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
UltrasonicSensor a=new UltrasonicSensor(SensorPort.S1);
TachoPilot r=new
TachoPilot(5.6f,16.0f,Motor.A,Motor.C,true);
r.setSpeed(300);
while(true)
{
if(a.getDistance()>30)
{
r.forward();
Delay.msDelay(100);
}
else
r.rotate(90);
}
}
}
机器人遇障碍转向I

17楼2013-10-30 11:17

/**********主角过关***************/
switch (GameMap.guan) {
case 0:
if(x_mali.getX()>=192) {
GameMap.guan = GameMap.tow;
x_guan++;
x_mali.setPosition(mali_X, mali_Y);
map.til_back02.setPosition(0, 0);
map.til_peng02.setPosition(0, 0);
map.til_zhebi02.setPosition(0, 0);
for(int i=0;i<map.map_peng01_h;i++) {
for(int j=0;j<map.map_peng01_w;j++) {
if(pengkuai[i][j]==0)continue;
else pengkuai[i][j] = 0;
}
}
for(int i=0;i<enemyN;i++) {
guaichuxian[i] = false;
enemy[i] = null;
}
DIR = R;
sfkillstate = false;
sfkill = false;
x_mali_arrout = false;
x_mali_state = zhanli;
mapmoveX = 0;
gametime01 = 0;
gametime02 = 100;
}
break;
case 1:
if(x_mali.getX()>=192) {
}
break;
}
/********当主角到地图移动量X的某个值开始刷怪***********/
switch (GameMap.guan) {
case 0:
if(!guaichuxian[0]&&!guaichuxian[1]&&!guaichuxian[2]&&mapmoveX==0) {
enemy[0] = new GameEnemy(0,200,180);
enemy[1] = new GameEnemy(0,200,140);
enemy[2] = new GameEnemy(0,200,220);
guaichuxian[0] = true;
guaichuxian[1] = true;
guaichuxian[2] = true;
}
if(!guaichuxian[3]&&!guaichuxian[4]&&!guaichuxian[5]&&mapmoveX==168) {
enemy[3] = new GameEnemy(1,300,180);
enemy[4] = new GameEnemy(2,300,220);
enemy[5] = new GameEnemy(2,360,180);
guaichuxian[3] = true;
guaichuxian[4] = true;
guaichuxian[5] = true;
}
if(!guaichuxian[0]&&!guaichuxian[1]&&mapmoveX==504) {
enemy[0] = new GameEnemy(1,300,180);
enemy[1] = new GameEnemy(1,300,220);
guaichuxian[0] = true;
guaichuxian[1] = true;
}
if(!guaichuxian[2]&&!guaichuxian[3]&&!guaichuxian[4]&&!guaichuxian[5]&&mapmoveX==1000) {
enemy[2] = new GameEnemy(0,300,180);
enemy[3] = new GameEnemy(0,300,220);
enemy[4] = new GameEnemy(2,360,140);
enemy[5] = new GameEnemy(2,400,160);
guaichuxian[2] = true;
guaichuxian[3] = true;
guaichuxian[4] = true;
guaichuxian[5] = true;
}
if(!guaichuxian[0]&&!guaichuxian[1]&&mapmoveX==1400) {
enemy[0] = new GameEnemy(0,140,100);
enemy[1] = new GameEnemy(0,180,80);
guaichuxian[0] = true;
guaichuxian[1] = true;
}
break;
case 1:
if(!guaichuxian[0]&&!guaichuxian[1]&&mapmoveX==652) {
enemy[0] = new GameEnemy(0,240,100);
enemy[1] = new GameEnemy(0,300,80);
guaichuxian[0] = true;
guaichuxian[1] = true;
}
if(!guaichuxian[2]&&!guaichuxian[3]&&!guaichuxian[4]&&mapmoveX==860) {
enemy[2] = new GameEnemy(1,140,100);
enemy[3] = new GameEnemy(0,160,90);
enemy[4] = new GameEnemy(1,180,80);
guaichuxian[2] = true;
guaichuxian[3] = true;
guaichuxian[4] = true;
}
if(!guaichuxian[5]&&!guaichuxian[0]&&!guaichuxian[1]&&mapmoveX==1180) {
enemy[5] = new GameEnemy(1,340,100);
enemy[0] = new GameEnemy(2,360,90);
enemy[1] = new GameEnemy(1,380,80);
guaichuxian[5] = true;
guaichuxian[0] = true;
guaichuxian[1] = true;
}
if(!guaichuxian[2]&&!guaichuxian[3]&&!guaichuxian[4]&&mapmoveX==1516) {
enemy[2] = new GameEnemy(1,140,100);
enemy[3] = new GameEnemy(2,160,90);
enemy[4] = new GameEnemy(1,180,80);
guaichuxian[2] = true;
guaichuxian[3] = true;
guaichuxian[4] = true;
}
break;
}
/******怪物逻辑******/
for(int i=0;i<enemyN;i++) {
if(enemy[i] == null)continue;
else {
enemy[i].logic(mapmoveX);
switch (enemy[i].type) {
case 0: if(enemy[i].sp_mogu01.getX()<-30)guaichuxian[i] = false; break;
case 1: if(enemy[i].sp_mogu02.getX()<-30)guaichuxian[i] = false; break;
case 2: if(enemy[i].sp_wugui.getX()<-30)guaichuxian[i] = false; break;
}
}
}
for(int i=0;i<flashN;i++) {
if(flash[i] == null)continue;
else {
flash[i].logic(mapmoveX);
switch (flash[i].type) {
case 0: if(flash[i].sfxiaoshi)jinbichuxian[i] = false; break;
case 1: if(flash[i].sfxiaoshi)shitouchuxian[i] = false; break;
}
}
}
if(z == 120)z = 0;I

20楼2013-10-30 12:14

/******主角超出屏幕死亡判断******/
if(x_mali.getY()>309&&!sfkillstate) {
index = 0;
x_mali_state = kill;
kill_state = U;
sfkillstate = true;
z = 0;
mid_kill = miclei.musiclong("kill");
miclei.musicstart(mid_kill);
}
/******主角逻辑******/
switch (x_mali_state) {
case zhanli:
/******主角站立状态碰到怪物死亡判断******/
for(int i=0;i<enemyN;i++) {
if(enemy[i] == null||enemy[i].sfkill)continue;
else {
switch (enemy[i].type) {
case 0:
if(!enemy[i].sfkill&&x_mali.collidesWith(enemy[i].sp_mogu01, true)) {
index = 0;
x_mali_state = kill;
kill_state = U;
sfkillstate = true;
z = 0;
mid_kill = miclei.musiclong("kill");
miclei.musicstart(mid_kill);
}
break;
case 1:
if(!enemy[i].sfkill&&x_mali.collidesWith(enemy[i].sp_mogu02, true)) {
index = 0;
x_mali_state = kill;
kill_state = U;
sfkillstate = true;
z = 0;
mid_kill = miclei.musiclong("kill");
miclei.musicstart(mid_kill);
}
break;
case 2:
if(!enemy[i].sfkill&&x_mali.collidesWith(enemy[i].sp_wugui, true)) {
index = 0;
x_mali_state = kill;
kill_state = U;
sfkillstate = true;
z = 0;
mid_kill = miclei.musiclong("kill");
miclei.musicstart(mid_kill);
}
break;
}
}
}
z++;
x_mali.setFrame(2);
break;
case yidong:
/******主角移动状态碰到怪物死亡判断******/
for(int i=0;i<enemyN;i++) {
if(enemy[i] == null||enemy[i].sfkill)continue;
else {
switch (enemy[i].type) {
case 0:
if(!enemy[i].sfkill&&x_mali.collidesWith(enemy[i].sp_mogu01, true)) {
index = 0;
x_mali_state = kill;
kill_state = U;
sfkillstate = true;
z = 0;
mid_kill = miclei.musiclong("kill");
miclei.musicstart(mid_kill);
}
break;
case 1:
if(!enemy[i].sfkill&&x_mali.collidesWith(enemy[i].sp_mogu02, true)) {
index = 0;
x_mali_state = kill;
kill_state = U;
sfkillstate = true;
z = 0;
mid_kill = miclei.musiclong("kill");
miclei.musicstart(mid_kill);
}
break;
case 2:
if(!enemy[i].sfkill&&x_mali.collidesWith(enemy[i].sp_wugui, true)) {
index = 0;
x_mali_state = kill;
kill_state = U;
sfkillstate = true;
z = 0;
mid_kill = miclei.musiclong("kill");
miclei.musicstart(mid_kill);
}
break;
}
}
}
z++;
switch (DIR) {
/******主角右移动逻辑******/
case R:
/******主角换帧******/
x_mali.nextFrame();
if(x_mali.getFrame() >= 3)x_mali.setFrame(0);
/******主角右移动地图移动判断******/
switch (GameMap.guan) {
case 0:
if(map.til_back01.getX()>-1740&&x_mali.getX()>=120) {
map.til_back01.move(-malisudu, 0);
map.til_peng01.move(-malisudu, 0);
map.til_zhebi01.move(-malisudu, 0);
mapmoveX+=4;
x_mali.move(-malisudu, 0);
/******主角右移动怪物移动判断******/
for(int i=0;i<enemyN;i++) {
if(enemy[i] == null)continue;
else {
switch (enemy[i].type) {
case 0: enemy[i].sp_mogu01.move(-malisudu, 0); break;
case 1: enemy[i].sp_mogu02.move(-malisudu, 0); break;
case 2: enemy[i].sp_wugui.move(-malisudu, 0); break;
}
}
}
}
break;
case 1:
if(map.til_peng02.getX()>-1740&&x_mali.getX()>=120) {
map.til_back02.move(-malisudu, 0);
map.til_peng02.move(-malisudu, 0);
map.til_zhebi02.move(-malisudu, 0);
mapmoveX+=4;
x_mali.move(-malisudu, 0);
/******主角右移动怪物移动判断******/
for(int i=0;i<enemyN;i++) {
if(enemy[i] == null)continue;
else {
switch (enemy[i].type) {
case 0: enemy[i].sp_mogu01.move(-malisudu, 0); break;
case 1: enemy[i].sp_mogu02.move(-malisudu, 0); break;
case 2: enemy[i].sp_wugui.move(-malisudu, 0); break;
}
}
}
}
break;
}
break;I

21楼2013-10-30 12:14

import java.awt.*;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.swing.JColorChooser;
import javax.swing.JOptionPane;
public class NoteBook extends Frame implements ActionListener
{
TextArea area=new TextArea();
//文件菜单项
MenuItem filenew=new MenuItem("新建");
MenuItem fileopen=new MenuItem("打开");
MenuItem filesave=new MenuItem("保存");
MenuItem fileexit=new MenuItem("退出");
//编辑菜单项
MenuItem editselectall=new MenuItem("全选");
MenuItem editcopy=new MenuItem("复制");
MenuItem editcut=new MenuItem("剪切");
MenuItem editpaste=new MenuItem("粘贴");
//11111111111111111111111111111111111111

22楼2013-11-06 10:56

MenuItem color=new MenuItem("背景颜色");
MenuItem about=new MenuItem("关于");//菜单中显示部分
//11111111111111111111111111111111111111
String fileName = null;
Toolkit toolKit=Toolkit.getDefaultToolkit();
Clipboard clipBoard=toolKit.getSystemClipboard();
private FileDialog openFileDialog= new FileDialog(this,"打开文件",FileDialog.LOAD);
private FileDialog saveAsFileDialog=new FileDialog(this,"文件存为",FileDialog.SAVE);
private void setup()
{
//文件菜单将"新建、打开保存和退出”置于其中
Menu file=new Menu("文件");
file.add(filenew); filenew.addActionListener(this);
file.add(fileopen); fileopen.addActionListener(this);
file.add(filesave); filesave.addActionListener(this);
file.addSeparator();
file.add(fileexit); fileexit.addActionListener(this);
//编辑菜单将"全选、复制、剪切、粘贴”置于其中
Menu edit=new Menu("编辑");
edit.add(editselectall); editselectall.addActionListener(this);
edit.addSeparator();
edit.add(editcopy); editcopy.addActionListener(this);
edit.add(editcut); editcut.addActionListener(this);
edit.add(editpaste); editpaste.addActionListener(this);
//222222222222222222222222222

23楼2013-11-06 11:00

double r,s;
Scanner input=new Scanner(System.in);
r=input.nextDouble();
s=3.14*r*r;
System.out.println(s);
输入半径求面积

28楼2013-11-20 11:09

算法与程序设计笔试复习资料
一、 Java基础知识
1、Java是一种面向对象的高级语言，在Java的世界中，一切都离不开类和对象。
2、Java源文件的扩展名为 .java。
3、Java程序中的注释有两种：//……… 单行注释
/*………*/多行注释
4、Java中输出的写法：System.out.println(“hello”); //输出hello并
System.out.print (a); //输出变量a的值
二、类与对象
1、类(class)：类是组成Java程序的基本要素，编写java程序其实就是编写一个
或者多个类。类：类是具有共同特征和行为的对象的抽象
2、对象：而对象是类的一个实例，指的是具体的一个实实在在的东西。一个类可以创建多个对象。如下：“a”就是“Bug”类的一个对象，f就是“Flower”类的一个对象。对象需要创建：
Bug a = new Bug();
Flower f=new Flower();
3、方法：方法就是类的行为（就是这个类能做什么），move(),turn()就是“Bug”这个类的方法.
4、方法的调用
对象名.方法名（参数）;
例如：alice是Bug类的一个对象
alice.move();调用了alice的move()方法
alice.turn()调用了alice的turn()方法
5、Java的文件中如果需要调用其他类，需要将这个类import进来。
6、Java是面向对象的语言，面向对象的语言有如下三个特征：(选择题)
（1）封装性：Java中的类本身就是一种封装。只向用户提供一些属性和方法。用户不用关心方法的实现过程。
（2）继承性：在Java中，可以充分利用原有的程序代码，这一特征就是继承。
（3）多态性：子类继承父类后，如果需要可以在子类中重写父类中已有的方法，也可以在同一个类中有多具有相同方法名，而参数个数不同的方法。
三、变量的定义及赋值
1、变量
（1）在程序中经过操作其值允许改变的量称为变量。
（2）变量定义：
格式：数据类型变量名；
int a,b,c; //定义了三个整型变量a,b,c
double x; //定义了实数型变量x
int a=3,b=5;//定义变量的同时为变量赋初值
每个变量均具有: 名字、类型、一定大小的存储单元以及值
2、赋值运算符=
作用：计算右边的结果，赋给左边的变量
例如：x=3; //将3赋给变量x
x=x+1; //取出x的值，加1之后赋给变量x,此行执行完，x值为4
y=x+5; //y的值为9

31楼2013-11-27 11:12

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.。。。。

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