求大神帮忙，一个点餐系统想改写为java applet，但不知怎么改

Question

你只需要把客户端做成 applet 即可，服务器不需要直接面对客户

Answer 1

现在问题是我不太会改，我看了下百度的，很多人是继承了java.applet,但我文件继承了Frame,
java又不能多继承，真的不太会改，最重要是我完全没接触过Applet，能帮我改一下吗

Answer 2

package main;
import game.framework.Animation;
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.lang.Thread.State;
import java.net.URL;
import java.util.ArrayList;
import java.util.Random;
import javax.swing.JButton;
import javax.swing.JPanel;//add speedboost
public class Main extends Applet implements Runnable, KeyListener{
    enum GameState {
        Running, Dead
    }
    static GameState state = GameState.Running;
private Background bg2, bg1;
private boolean restart = false;    
private Player player;
private SpeedBoost sb1;
private Image image;
private Image backsprite1, backsprite2;
private Image player1, dad1, dad2, dad3;
private Image player2;
private Image player3;
private Image back1;
private Image back2, endscreen;
private Image back3, coin, bigcoin;
 private Image back4, sbimg;
 public Image tilebase, platform;
 private Block block1, block2, block3, block4;
private Coin coin1, coin2, coin3, coin4, coin5;
private LargeCoin bc1; 
//use for the base...
private Dad dad;
private Graphics second;
private Animation playwalk, dadwalk;
private URL base;
private Platform plat1, plat2, plat3, plat4, plat5, plat6, plat7;
public static int score = 1, coinsint = 1;
public static String score2, coins = "1";
public static int scorespeed = 1;
public int hs1, hs2, hs3, hs4, hs5, totcoins;
public String hs1s, hs2s, hs3s, hs4s, hs5s, totcoinss;
public Ends ends;
    @Override
        public void init() {
        setSize(800, 480);
        setBackground(Color.WHITE);
        setFocusable(true);
        addKeyListener(this);
        Frame frame = (Frame) this.getParent().getParent();
        frame.setTitle("Game v1.2.2");
        try {
            base = getDocumentBase();
        } catch (Exception e) {
            // TODO: handle exception
        }        endscreen = getImage(base, "data/endscreen.png");        coin = getImage(base, "data/coin.png");
  bigcoin = getImage(base, "data/bigcoin.png");      tilebase = getImage(base, "data/tilebase.png");
 platform = getImage(base, "data/blocksmall.png");
       back1 = getImage(base, "data/back1.png");
        back2 = getImage(base, "data/back2.png");
        back3 = getImage(base, "data/back3.png");
        back4 = getImage(base, "data/back4.png");`enter code here`        sbimg = getImage(base, "data/speedboost.png");
        player1 = getImage(base, "data/player1.png");
        player2 = getImage(base, "data/player2.png");
        player3 = getImage(base, "data/player3.png");        dad1 = getImage(base, "data/dad1.png");
        dad2 = getImage(base, "data/dad2.png");
        dad3 = getImage(base, "data/dad3.png");        backsprite1 = back1;
        backsprite2 = back2;        playwalk = new Animation();
      playwalk.addFrame(player1, 80);
      playwalk.addFrame(player2, 80);
      playwalk.addFrame(player3, 80);dadwalk = new Animation();
dadwalk.addFrame(dad1, 80);
dadwalk.addFrame(dad2, 80);
dadwalk.addFrame(dad3, 80);
    }
public void animate() {
    playwalk.update(15); 
dadwalk.update(15);
    }
@Override
        public void start() {
    state = state.Running;
          ends = new Ends(-3, 0);
                 //create objects at positions
            @Override
                public void stop() {
                // TODO Auto-generated method stub
            }            @Override
            public void destroy() {
                // TODO Auto-generated method stub
            }            @Override
            public void run() {
                if (state == GameState.Running) {
                while (true) {
                    //selecting sprites for the background                    //updates go here
if(bg1.getBgX() < -2100){
    bg1.setBgX(2100);
}
 if(bg2.getBgX() < -2100){
    bg2.setBgX(2100);
} //backgrounds arent working
 if(bg1.getBgX() > 2000){
                           Random rand = new Random();                            int  nel = rand.nextInt(4) + 1;
                             if(nel == 1){
                                backsprite1 = back1;
                             }if(nel == 2){
                                 backsprite1 = back2;
                             }if(nel == 3){
                                 backsprite1 = back3;
                             }if(nel == 4){
                                backsprite1 = back4;
                             }
                    }                    player.update();                    dad.update();                    bg1.update();
                   bg2.update();                   coin1.update();
                   coin2.update();
                   coin3.update();
                   coin4.update();
                   coin5.update();
                   plat1.update();
                    plat2.update();
                    plat3.update();
                    plat4.update();
                    plat5.update();
                    plat6.update();
                    plat7.update();                    if(Block.lives < 0){
                        state = GameState.Dead; }                    animate();
                    repaint();
                    try {
                        Thread.sleep(17);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }            }
            @Override
            public void update(Graphics g) {
                if (image == null) {
                    image = createImage(this.getWidth(), this.getHeight());
                    second = image.getGraphics();
                }
   
                second.setColor(getBackground());
                second.fillRect(0, 0, getWidth(), getHeight());
                second.setColor(getForeground());
                paint(second);                g.drawImage(image, 0, 0, this);
            }
            @Override
            public void paint(Graphics g) {
                if (state == GameState.Running) {
                //main graphics identifyers here
            // first are drawn below last
                 //need to make the platform lower down, see class for explanation                    g.drawImage(backsprite1, bg1.getBgX(), bg1.getBgY(), this);
                    g.drawImage(backsprite2, bg2.getBgX(), bg2.getBgY(), this);
                 g.drawImage(playwalk.getImage(), player.getCenterX(), player.getCenterY(), this);                 g.drawImage(platform, plat1.getCenterX(), plat1.getCenterY(), this);
                    g.drawImage(platform, plat2.getCenterX(), plat2.getCenterY(), this);
                    g.drawImage(platform, plat3.getCenterX(), plat3.getCenterY(), this);
                    g.drawImage(platform, plat4.getCenterX(), plat4.getCenterY(), this);
                    g.drawImage(platform, plat5.getCenterX(), plat5.getCenterY(), this);
                    g.drawImage(platform, plat6.getCenterX(), plat6.getCenterY(), this);
                    g.drawImage(platform, plat7.getCenterX(), plat7.getCenterY(), this);                    g.drawImage(sbimg, sb1.getCenterX(), sb1.getCenterY(), this);                    g.drawImage(bigcoin, bc1.centerX, bc1.centerY, this);                    g.drawImage(dadwalk.getImage(), dad.centerX, dad.centerY, this);           g.drawImage(tilebase, block1.getCenterX(), block1.getCenterY(), this);
            g.drawImage(tilebase, block2.getCenterX(), block2.getCenterY(), this);
            g.drawImage(tilebase, block3.getCenterX(), block3.getCenterY(), this);
            g.drawImage(tilebase, block4.getCenterX(), block4.getCenterY(), this);            g.drawImage(coin, coin1.getCenterX(), coin1.getCenterY(), this);
            g.drawImage(coin, coin2.getCenterX(), coin2.getCenterY(), this);
            g.drawImage(coin, coin3.getCenterX(), coin3.getCenterY(), this);
            g.drawImage(coin, coin4.getCenterX(), coin4.getCenterY(), this);
            g.drawImage(coin, coin5.getCenterX(), coin5.getCenterY(), this);            g.setColor(Color.MAGENTA);
            g.drawString(score2, 700, 25);
            Font font = new Font("Serif", Font.PLAIN, 36);
            g.setFont(font);            g.drawString(coins, 20, 25);
            }else if (state == GameState.Dead) {
                totcoins += coinsint;
                coinsint = 0;
                hs1s = String.valueOf(hs1);
                hs2s = String.valueOf(hs2);
                hs3s = String.valueOf(hs3);
                hs4s = String.valueOf(hs4);
                hs5s = String.valueOf(hs5);
                totcoinss = String.valueOf(totcoins);
                if(score > hs1){
                    hs1 = score;
                }else if(score > hs2){
                    hs2 = score;
                }else if(score > hs3){
                        hs3 = score;
                    }else if(score > hs4){
                        hs4 = score;
                    }else if(score > hs5){
                        hs5 = score;
                    }
                scorespeed = 0;
              //format this shit up in here
                //when restart is init, then this will be tested
                g.setColor(Color.BLACK);
                g.fillRect(0, 0, 800, 480);
            g.setColor(Color.WHITE);
            g.drawString(hs1s, 230, 220);
            g.drawString(hs2s, 230, 250);
            g.drawString(hs3s, 230, 280);
            g.drawString(hs4s, 230, 310);
            g.drawString(hs5s, 230, 340);
           g.drawString(totcoinss, 700, 100);
           g.drawImage(endscreen, ends.cornX, ends.cornY, this);                }            }
    //fix the android stuff
}参照这个试试

Answer 3

Quote: 引用 8 楼 defonds 的回复:

但是我的class继承了frame，java不能多继承，那applet怎么继承，还是不懂

Answer 4

版主，能改出来么，我自己今天弄了一早上还是不行
对不起版主，有个小问题，我想把服务端也做一个窗口出来，就加了了点东西，但为什么窗口打开瞬间又关闭了，一执行了start()就会这样
import java.awt.BorderLayout;
import java.awt.Frame;
import java.awt.TextArea;
import java.io.*;
import java.net.*;
import java.util.*;public class Server extends Frame{

boolean started = false;
ServerSocket ss = null;
TextArea taContent = new TextArea();

List<Client> clients = new ArrayList<Client>();

public static void main(String[] args) {
new Server().launchFrame();
}

public void launchFrame() {
setLocation(400, 300);
this.setSize(300, 300);
add(taContent, BorderLayout.NORTH);

setVisible(true);
start();
}


public void start() {
try {
ss = new ServerSocket(8888);
started = true;
} catch (BindException e) {
//System.out.println("1");
//System.out.println("2");
System.exit(0);
} catch (IOException e) {
e.printStackTrace();
}

try {

while(started) {
Socket s = ss.accept();
Client c = new Client(s);
System.out.println("a client connected!");
new Thread(c).start();
clients.add(c);
//dis.close();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
ss.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}

class Client implements Runnable {
private Socket s;
private DataInputStream dis = null;
private DataOutputStream dos = null;
private boolean bConnected = false;

public Client(Socket s) {
this.s = s;
try {
dis = new DataInputStream(s.getInputStream());
dos = new DataOutputStream(s.getOutputStream());
bConnected = true;
} catch (IOException e) {
e.printStackTrace();
}
}

public void send(String str) {
try {
dos.writeUTF(str);
} catch (IOException e) {
clients.remove(this);
//System.out.println("3");
//e.printStackTrace();
}
}

public void run() {
try {
while(bConnected) {
String str = dis.readUTF();
System.out.println(str);
for(int i=0; i<clients.size(); i++) {
Client c = clients.get(i);
c.send(str);
//System.out.println(" a string send !");
}
/*
for(Iterator<Client> it = clients.iterator(); it.hasNext(); ) {
Client c = it.next();
c.send(str);
}
*/
/*
Iterator<Client> it = clients.iterator();
while(it.hasNext()) {
Client c = it.next();
c.send(str);
}
*/
}
} catch (EOFException e) {
System.out.println("Client closed!");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(dis != null) dis.close();
if(dos != null) dos.close();
if(s != null)  {
s.close();
//s = null;
}

} catch (IOException e1) {
e1.printStackTrace();
}


}
}

}
}