1.Thập phân sang nhị phân  2

2.Gui len 1 so neu so do la so nguyen thi cho phep dang ky con k thi bao loi 5(9%)

3.Máy tính  8(19%)

4.Giải phương trình  11(29%)

5Nhị phân sang thập phân 14(40%)

6.CHƯƠNG TRÌNH KIỂM TRA SỐ NGUYÊN TỐ18(54%)

7.CHƯƠNG TRÌNH PHẦN BLUTOOTH 22(66%)

8.Sắp xếp từ bé đến lớn 27(82%)

9.Chuyển từ hoa sang thường 31(90%)

1.Thập phân sang nhị phân

sevlet

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

    protected void doGet (HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

  PrintWriter out=response.getWriter();

  String t3=request.getParameter("so");

  int so=0;

  so=Integer.parseInt(t3);

  String so_doi=Integer.toBinaryString(so);

out.print(so_doi);

    }

}

////////////////////////////////////////////////////////////////////////////////////////////////////////////////

client

package hac;

import javax.microedition.midlet.*;

import javax.microedition.midlet.*;

import java.io.*;

import javax.microedition.lcdui.*;

import javax.microedition.io.Connector;

import javax.microedition.io.HttpConnection;

public class Midlet extends MIDlet implements Runnable, CommandListener{

  HttpConnection con;

      Thread dk,dn;

      Form fr;

      Display di;

      TextField t1;

      StringItem st;

      Command c1,c2;

      InputStream in;

    public void startApp() {

      di=Display.getDisplay(this);

      fr=new Form("Tuyen");

      t1=new TextField("nhapso","",10,TextField.ANY);

      c1=new Command("Send",Command.OK,1);

      c2=new Command("Exit",Command.EXIT,1);

      st=new StringItem("","");

      fr.append(st);

      fr.append(t1);

      fr.addCommand(c1);

      fr.addCommand(c2);

      fr.setCommandListener(this);

      di.setCurrent(fr);

    }

    public void pauseApp() {

    }

    public void destroyApp(boolean unconditional) {

    }

    public void commandAction(Command c, Displayable d) {

        if(c==c1){

        dk=new Thread(this);

        dk.start(); }

        if(c==c2)this.notifyDestroyed();

    }

    public void run(){

    try{

        String url,t3,t4;

        t3=t1.getString();

    +t3;

     con=(HttpConnection)Connector.open(url);

     con.setRequestMethod(HttpConnection.GET);

     ByteArrayOutputStream data=new  ByteArrayOutputStream();

     in=con.openInputStream();

     int ch;

     while((ch=in.read())!=-1)

    {data.write(ch);}

     byte b[]=data.toByteArray();

     String s=new String(b);

     st.setText("ket qua:"+s);

     }catch(Exception e){}

    }

   }

2.Gui len 1 so neu so do la so nguyen thi cho phep dang ky con k thi bao loi

* Server

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class NewServlet extends HttpServlet {

    protected void doGet (HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

  PrintWriter out=response.getWriter();

  String t3=request.getParameter("so");

int so= Integer.parseInt(t3);

int d=0;

for(int i=2;i<=so/2;i++)

    if(so%i==0)d++;

if(d==0)

    out.print("ok");

    }

}

/////////////////////////////////////////////////////////////////////////////////////////////////////////

* Client

package hac;

import javax.microedition.midlet.*;

import javax.microedition.midlet.*;

import java.io.*;

import javax.microedition.lcdui.*;

import javax.microedition.io.Connector;

import javax.microedition.io.HttpConnection;

public class Midlet extends MIDlet implements Runnable, CommandListener{

  HttpConnection con;

      Thread dk;

      Form fr,f1;

      Display di;

      TextField t1,t2,t3;

      StringItem st;

      Command c1,c2,c3;

      InputStream in;

    public void startApp() {

      di=Display.getDisplay(this);

      fr=new Form("Tuyen");

      t1=new TextField("nhapso","",10,TextField.NUMERIC);

      c1=new Command("Send",Command.OK,1);

      c2=new Command("Exit",Command.EXIT,1);

      st=new StringItem("","");

      fr.append(st);

      fr.append(t1);

      fr.addCommand(c1);

      fr.addCommand(c2);

      fr.setCommandListener(this);

      di.setCurrent(fr);

      f1=new Form("Dangky");

      t2=new TextField("User","",10,TextField.ANY);

      t3=new TextField("Pass","",10,TextField.PASSWORD);

      c3=new Command("Dangky",Command.OK,1);

      f1.addCommand(c3);

      f1.addCommand(c2);

      f1.append(t3);

      f1.append(t2);

      f1.setCommandListener(this);

    }

    public void pauseApp() {

    }

    public void destroyApp(boolean unconditional) {

    }

 public void commandAction(Command c, Displayable d) {

        if(c==c1){

        dk=new Thread(this);

        dk.start(); }

        if(c==c3){st.setText("Hello")}

        if(c==c2)this.notifyDestroyed();

          }

    public void run(){

    try{

        String url,t3,t4;

        t3=t1.getString();

    +t3;

     con=(HttpConnection)Connector.open(url);

     con.setRequestMethod(HttpConnection.GET);

     ByteArrayOutputStream data=new  ByteArrayOutputStream();

     in=con.openInputStream();

     int ch;

     while((ch=in.read())!=-1)

    {data.write(ch);}

     byte b[]=data.toByteArray();

     String s=new String(b);

     if(s.equals("ok")){di.setCurrent(f1);

     }

     else

     st.setText("xin loi ban qua den");

     }catch(Exception e){}

    }

   }

3.Máy tính

sevlet

import java.io.*;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.lang.*;

public class NewServlet extends HttpServlet {

    protected void doGet (HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

  PrintWriter out=response.getWriter();

  String t1=request.getParameter("a");

  String t2=request.getParameter("b");

  String t3=request.getParameter("c");

  int a=Integer.parseInt(t1);

  int b=Integer.parseInt(t2);

  String c=String.valueOf(t3);

float i;

  if(c.equals("+")){i=a+b; out.print(i);}

  if(c.equals("-")){i=a-b; out.print(i);}

  if(c.equals("x")){i=a*b;out.print(i);}

  if(c.equals(":")){i=a/b;out.print(i);}  

                   }

 }

Client

import javax.microedition.midlet.*;

import java.io.*;

import javax.microedition.lcdui.*;

import javax.microedition.io.Connector;

import javax.microedition.io.HttpConnection;

public class Midlet extends MIDlet implements Runnable, CommandListener{

  HttpConnection con;

      Thread dk;

      Form fr;

      Display di;

      TextField t1,t2,t3;

      StringItem st;

      Command c1,c2,c3;

      InputStream in;

    OutputStream out;

    String url=null;

    public void startApp() {

      di=Display.getDisplay(this);

      fr=new Form("Tuyen");

      t1=new TextField("nhap a:","",10,TextField.NUMERIC);

      t2=new TextField("nhap b:","",10,TextField.NUMERIC);

      t3=new TextField("nhap pt:","",10,TextField.ANY);

      c1=new Command("Send",Command.OK,1);

      c2=new Command("Exit",Command.EXIT,2);

      st=new StringItem("","");

      fr.append(st);

      fr.append(t1);

      fr.append(t2);

      fr.append(t3);

      fr.addCommand(c1);

      fr.addCommand(c2);

      fr.setCommandListener(this);

      di.setCurrent(fr);

    }

    public void pauseApp() {

    }

    public void destroyApp(boolean unconditional) {

    }

    public void commandAction(Command c, Displayable d) {

        if(c==c1){

        dk=new Thread(this);

        dk.start(); }

        if(c==c2)

            this.notifyDestroyed(); 

    }

    public void run(){

    try{

        String url,t6,t4,t5;

       int k,n;

        t4=t1.getString();

        t5=t2.getString();

        t6=t3.getString();

        k=Integer.parseInt(t4);

        n=Integer.parseInt(t5);

        String j=String.valueOf(t6);

url="http://localhost:8080/tuyen/NewServlet?a="+t4+"&b="+t5+"&c="+t6;

     con=(HttpConnection)Connector.open(url);

     con.setRequestMethod(HttpConnection.GET);

     ByteArrayOutputStream data=new  ByteArrayOutputStream();

     in=con.openInputStream();

     int ch;

     while((ch=in.read())!=-1)

    {data.write(ch);}

     byte b[]=data.toByteArray();

     String s=new String(b);

     st.setText(s);

     }catch(Exception e){}

    }

   }

4.Giải phương trình

Server

import java.io.*;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import java.lang.*;

public class NewServlet extends HttpServlet {

        protected void doGet (HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {   

  PrintWriter out=response.getWriter();

  String t1=request.getParameter("a");

  String t2=request.getParameter("b");

  String t3=request.getParameter("c");

  int a=Integer.parseInt(t1);

  int b=Integer.parseInt(t2);

  int c=Integer.parseInt(t3);

 float del;

 del=b*b-4*a*c;

  if(del

  if(del==0){float n=-b/(2*a); out.print(n);}

  if(del>0)

      {float n1,n2;

           n1=-b+ (float)Math.sqrt(del)/(2*a);

           n2=-b- (float)Math.sqrt(del)/(2*a);

           out.print(n1);

           out.print(n2);

                   }

      }

}

/////////////////////////////////////////////////////////////////////////////////////////////////////////

Client

import javax.microedition.midlet.*;

import java.io.*;

import javax.microedition.lcdui.*;

import javax.microedition.io.Connector;

import javax.microedition.io.HttpConnection;

public class Midlet extends MIDlet implements Runnable, CommandListener{

  HttpConnection con;

      Thread dk;

      Form fr,f1;

      Display di;

      TextField t1,t2,t3;

      StringItem st;

      Command c1,c2,c3;

      InputStream in;

    public void startApp() {

      di=Display.getDisplay(this);

      fr=new Form("Tuyen");

      t1=new TextField("nhap a:","",10,TextField.NUMERIC);

      t2=new TextField("nhap b:","",10,TextField.NUMERIC);

      t3=new TextField("nhap c:","",10,TextField.NUMERIC);

      c1=new Command("Send",Command.OK,1);

      c2=new Command("Exit",Command.EXIT,1);

      st=new StringItem("","");

      fr.append(st);

      fr.append(t1);

      fr.append(t2);

      fr.append(t3);

      fr.addCommand(c1);

      fr.addCommand(c2);

      fr.setCommandListener(this);

      di.setCurrent(fr);

    }

public void pauseApp() {

    }

public void destroyApp(boolean unconditional) {

    }

public void commandAction(Command c, Displayable d) {

        if(c==c1){

        dk=new Thread(this);

        dk.start(); }

        if(c==c2)

            this.notifyDestroyed(); 

    }

    public void run(){

    try{

        String url,t6,t4,t5;

       int k,n,j;

        t4=t1.getString();

        t5=t2.getString();

        t6=t3.getString();

        k=Integer.parseInt(t4);

        n=Integer.parseInt(t5);

         j=Integer.parseInt(t6);+t4+"&b="+t5+"&c="+t6;

     con=(HttpConnection)Connector.open(url);

     con.setRequestMethod(HttpConnection.GET);

     ByteArrayOutputStream data=new  ByteArrayOutputStream();

     in=con.openInputStream();

     int ch;

     while((ch=in.read())!=-1)

    {data.write(ch);}

     byte b[]=data.toByteArray();

     String s=new String(b);

     st.setText(s);

     }catch(Exception e){}

    }

   }

5Nhị phân sang thập phân

client

package nhi_thap;

import java.io.*;

import java. microedition .io.*;

import javax.microedition.io.Connector;

import javax.microedition.io.HttpConnection;

import javax.microedition.lcdui.*;

import javax.microedition.midlet.*;

public class Midlet extends MIDlet implements CommandListener,Runnable{

    Display di;

    Form f1,f2;

    TextField t1;

    StringItem it;

    Command c1,c2,c3,c4;

    Thread th;

    HttpConnection con;

    InputStream in;

    String url=null;

    public void startApp() {

        di=Display.getDisplay(this);

        f1=new Form("nhi sang thap");

        t1=new TextField("so nhi phan:","",20,TextField.ANY);

        it=new StringItem("","");

        f1.append(t1);

        f1.append(it);

        c1=new Command("connect",Command.OK,1);

        c2=new Command("exit",Command.EXIT,2);

        c3=new Command("back",Command.BACK,3);

        c4=new Command("ok",Command.OK,4);

        f1.addCommand(c1);

        f1.addCommand(c2);

        f1.setCommandListener(this);

    }

    public void pauseApp() {

        di.setCurrent(f1);

    }  

    public void destroyApp(boolean unconditional) {

    }

      public void connect(){

                   try{

                    con=(HttpConnection)Connector.open(url);

                    con.setRequestMethod(HttpConnection.GET);

                   }

                   catch(Exception e){

                    st.setText("K?t n?i l?i: "+e.getMessage());

                   }

    }

    public void in(){

            String;

                   try{

                             in=con.openInputStream();

                             int length=(int)con.getLength();

                             byte server[];

                             if(length!=-1){

                                      server=new byte[length];

                                      in.read(server);

                                      str=new String(server);

                             }

                             else

                             {

                                      ByteArrayOutputStream br=new

                                ByteArrayOutputStream();

                                      int ch;

                                      while((ch=in.read())!=-1)

                                      br.write(ch);

                                      str=new String(br.toByteArray());                               

                                      br.close();

                        }

                        st.setText(str);

                   }

                   catch(Exception e){

                   }

          }

        public synchronized void run(){

            this.connect();

            this.in();

        }

    public void commandAction(Command c, Displayable d)

    {

        if(c==c1)

        {     +t1.getString()+"";

        th=new Thread(this);

        th.start();

        }

    }

}

///////////////////////////////////////////////////////////////////////////////////////////////////////

Sevlet

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@WebServlet(name = "NewServlet", urlPatterns = {"/NewServlet"})

public class NewServlet extends HttpServlet {

private int s;

private char key;

@Override

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

PrintWriter out=response.getWriter();

String t3=request.getParameter("so");

if(key=='1')

{

String st;

st = String.valueOf(t3);

char a;

int temp=0,n=1,sodoi=0;

for(int i=st.length()-1;i>=0;i--)

{

a = st.charAt(i);

temp = (int)a;

temp = temp - 48;

sodoi = sodoi + temp*n;

n=n*2;

}

out.print(sodoi);

}

else if(key=='1')

{

s=Integer.parseInt(t3);

}

String so_doi=Integer.toBinaryString(s);

out.print(so_doi);

}

}

6.CHƯƠNG TRÌNH KIỂM TRA SỐ NGUYÊN TỐ

·       client

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

import javax.microedition.io.*;

import java.io.*;

public class songuyento_c extends MIDlet implements CommandListener, Runnable {

            Display di;

            Form f;

            TextField tf;

            StringItem si;

            Command c1,c2;

            HttpConnection con;

            InputStream in;

            Thread th;

    public void startApp() {

            di= Display.getDisplay(this);

            f= new Form ("so nguyen to");

            si= new StringItem ("ket qua: ","");

            c1= new Command ("Exit", Command.EXIT,1);

            c2= new Command ("Test", Command.OK,1);

            tf= new TextField ("Nhap so","", 3, TextField.NUMERIC);

            f.append(tf);

            f.append(si);

            f.addCommand(c1);

            f.addCommand(c2);

            f.setCommandListener(null);

            di.setCurrent(f);

    }

    public void pauseApp() {

    }

    public void destroyApp(boolean unconditional) {

    }

    public void commandAction(Command c, Displayable d) {

       if (c==c1){

        notifyDestroyed();

       }

       else

           if (c==c2){

           th= new Thread(this);

           th.start();

           }

    }

    public void run() {

        String t= tf.getString();

        int n= Integer.parseInt(t);

        String url= "http://localhost:8080/songuyento/songuyento?so="+n;

        try{

        String;

                             InputStream in=con.openInputStream();

                             int length=(int)con.getLength();

                             byte server[];

                             if(length!=-1){

                                      server=new byte[length];

                                      in.read(server);

                                      str=new String(server);

                             }

                             else

                             {

                                      ByteArrayOutputStream br=new

                                          ByteArrayOutputStream();

                                      int ch;

                                      while((ch=in.read())!=-1)

                                                br.write(ch);

                                      str=new String(br.toByteArray());

                                      br.close();

                        }

                        si.setText(str);

              }catch(Exception e)

                {

                e.getMessage();

                }

    }}

·       server

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class songuyento extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

                    String s= request.getParameter("so");

                    int n= Integer.parseInt(s);

              PrintWriter out= response.getWriter();

             int i,kt=0;

           for (i=2; i<n;i++){

           if (n%i==0){

           kt=kt+1;

           }

           }

                if (kt==0){

            out.print("ok");}

                else

                    out.print("not ok");

           }     }

7.CHƯƠNG TRÌNH PHẦN BLUTOOTH

·       Server

  import javax.microedition.midlet.*;

import javax.bluetooth.*;

import javax.microedition.lcdui.*;

import java.io.*;

import javax.microedition.io.*;

public class MidletS extends MIDlet implements CommandListener, Runnable {

    Display di;Form f;Command c1;LocalDevice ld;

    Thread th;StreamConnectionNotifier scn;

    StreamConnection sc;OutputStream out;

    InputStream in;

    UUID id;

    String url;

    public void startApp() {

        di=Display.getDisplay(this);

        f=new Form("dfg");

        c1=new Command("stop",Command.OK,1);

        f.addCommand(c1);

        f.setCommandListener(this);

        di.setCurrent(f);

        th=new Thread(this);

        th.start();

    }

    public void pauseApp() {

    }

    public void destroyApp(boolean unconditional) {

    }

    public void commandAction(Command c, Displayable d) {

    }

    public void run() {

        try{

            f.append("init Server");

            ld=LocalDevice.getLocalDevice();

            ld.setDiscoverable(DiscoveryAgent.GIAC);

            id=new UUID("123",true);

           +id;//+";name=BC;authorize=true";

            f.append(url);

            scn=(StreamConnectionNotifier)Connector.open(url);

            f.append("wating...");

            sc=scn.acceptAndOpen();

            f.append("connected");

            out=sc.openOutputStream();

            in=sc.openInputStream();

            int len=in.read();

            int temp=0;

            byte b[]=new byte[len];

            while(temp!=len)

            {

                int k=in.read(b, temp, len-temp);

                temp=temp+k;

            }

            String t=new String(b);

            f.append(t);

            String t1="hello C";

            out.write(t1.length());

            out.write(t1.getBytes());

        }

        catch(Exception e){

            System.out.print("

loi "+e.toString());

        }

    }

}

·       Client

import javax.microedition.midlet.*;

import javax.bluetooth.*;

import javax.microedition.lcdui.*;

import java.io.*;

import javax.microedition.io.*;

public class MidletC extends MIDlet implements Runnable, DiscoveryListener, CommandListener{

    Display di;Form f;Command c1;LocalDevice ld;

    Thread th;StreamConnectionNotifier scn;

    StreamConnection sc;OutputStream out;

    DiscoveryAgent agent;

    InputStream in;

    UUID id;

    String url;

    public void startApp() {

        di=Display.getDisplay(this);

        f=new Form("dfg");

        c1=new Command("stop",Command.OK,1);

        f.addCommand(c1);

        f.setCommandListener(this);

        di.setCurrent(f);

        th=new Thread(this);

        th.start();

    }

    public void pauseApp() {

    }

    public void destroyApp(boolean unconditional) {

    }

    public void run() {

        try{

            f.append("init client");

            ld=LocalDevice.getLocalDevice();

            agent=ld.getDiscoveryAgent();

            agent.startInquiry(DiscoveryAgent.GIAC, this);

            f.append("fidding...");

        }

        catch(Exception e){

        }

    }

    public void deviceDiscovered(RemoteDevice rd, DeviceClass dc) {

        f.append("device:");

        f.append(rd.getBluetoothAddress());

        try{

            UUID ids[]=new UUID[1];

            ids[0]=new UUID("123",true);

            agent.searchServices(null, ids, rd, this);

        }

        catch(Exception e){

            System.out.print("dv:"+e.toString());

        }

    }

    public void inquiryCompleted(int i) {

    }

    public void serviceSearchCompleted(int i, int i1) {

        try{

            sc=(StreamConnection)Connector.open(url);

            out=sc.openOutputStream();

            in=sc.openInputStream();

            String t1="hello S";

            out.write(t1.length());

            out.write(t1.getBytes());

            int len=in.read();

            int temp=0;

            byte b[]=new byte[len];

            while(temp!=len)

            {

               int k=in.read(b, temp, len-temp);

                temp=temp+k;

            }

            String t=new String(b);

            f.append(t);

        }

        catch(Exception e){

            System.out.print(e.toString());

        }

    }

    public void servicesDiscovered(int i, ServiceRecord[] srs) {

        url=srs[0].getConnectionURL(ServiceRecord.AUTHENTICATE_ENCRYPT, false);

        f.append(url);

    }

    public void commandAction(Command c, Displayable d) {

    }

}

8.Sắp xếp từ bé đến lớn

//client

import javax.microedition.midlet.*;

import java.io.*;

import javax.microedition.lcdui.*;

import javax.microedition.io.Connector;

import javax.microedition.io.HttpConnection;

public class sxep extends MIDlet implements Runnable,CommandListener {

    Display di;

    Form f;

    TextField tf1;

    StringItem it;

    HttpConnection con;

    InputStream in;

    OutputStream out;

    String url=null;

    Command c1,c2;

    Thread th; 

    public void startApp() {

       di=Display.getDisplay(this);

       f=new Form ("sapxep");

       tf1=new TextField("t1","",20,TextField.NUMERIC);

       f.append(tf1);

       it=new StringItem ("ket qua:","");

       f.append(it);

       c1=new Command ("sxep",Command.OK,1);

       c2=new Command ("exit",Command.EXIT,2);

       f.addCommand(c1);

       f.addCommand(c2);

       f.setCommandListener(this);

       di.setCurrent(f);

    }

    public void pauseApp() {

    }

    public void destroyApp(boolean unconditional) {

    }

    public void commandAction (Command c,Displayable d){

        if (c==c2) {this.notifyDestroyed ();}

        if (c==c1){

            th=new Thread (this);

            th.start();

        }

    }

    public void run(){

        try{

        String t2;

        int k;

        t2=tf1.getString();

       +t2;

        con = (HttpConnection)Connector.open(url);

        con.setRequestMethod (HttpConnection.GET);

        in=con.openInputStream();

        ByteArrayOutputStream data = new ByteArrayOutputStream();

        int ch;

        while((ch=in.read())!=-1)

        {data.write(ch);}

         byte b[]=data.toByteArray();

         String s=new String(b);

         int m=Integer.parseInt(s);

         it.setText(String.valueOf(m));

        }catch(Exception e){}

}}

//sever

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class sxep1 extends HttpServlet {

    protected void doGet (HttpServletRequest request, HttpServletResponse response)

    throws ServletException, IOException {

  PrintWriter out=response.getWriter();

  String t3=request.getParameter("t1");

  String xau= String.valueOf(t3);

  char t;

  char []a=xau.toCharArray();

  for(int i=0;i<xau.length();i++)

  {for(int j=0;j<=i;j++)

  {if(a[i]<a[j]){t=a[i];

  a[i]=a[j];

  a[j]=t;}}

  }

out.print(a); 

    }

}

9.Chuyển từ hoa sang thường

client

import java.io.*;

import javax.microedition.io.*;

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

public class chuyendoixau extends MIDlet implements Runnable,CommandListener{

    Display di;

    Form f;

    TextField tf;

    StringItem it;

    Command c1,c2;

    Thread th;

    OutputStream out;

    InputStream in;

    HttpConnection con;

    String url;

    public void startApp() {

        di=Display.getDisplay(this);

        f=new Form("chuyen doi chuoi ky tu");

        tf=new TextField("chuoi ky tu:","",20,TextField.NUMERIC);

        it=new StringItem("chuoi sau chuyen thanh chu hoa:","");

        c1=new Command("EXIT",Command.EXIT,1);

        c2=new Command("OK",Command.OK,1);

        f.append(tf);

        f.append(it);

        f.addCommand(c1);

        f.addCommand(c2);

        f.setCommandListener(this);

        di.setCurrent(f);

    }

    public void pauseApp() {

    }

    public void destroyApp(boolean unconditional) {

    }

    public void commandAction(Command c, Displayable d){

        if(c==c1)

            notifyDestroyed();

        else

            if(c==c2)

                th=new Thread();

                th.start();

    }

    public void run(){

        try{

          String x;

          x=tf.getString();

          url="http://localhost:8080/chuyendoixaukytu/chuyendoi?chuoi="+x;

          con=(HttpConnection)Connector.open(url);

          con.setRequestMethod(HttpConnection.GET);

          ByteArrayOutputStream data=new  ByteArrayOutputStream();

          in=con.openInputStream();

          int ch;

          while((ch=in.read())!=-1)

              data.write(ch);

          byte b[]=data.toByteArray();

          String st=new String(b);

          it.setText(st+tf);

        }catch(Exception e){}

    }

}

sevlet

import java.io.*;

import javax.servlet.http.*;

public class Servlet_chuyendoi extends HttpServlet {

   protected void doGet(HttpServletRequest req, HttpServletResponse res) throws IOException{

        String t1;

        PrintWriter out = res.getWriter();

        t1=req.getParameter("chuoi:");

        if(t1.equals(":"))

          t1=t1.substring(2,t1.length());

          String t2=t1.toLowerCase(); // từ hoa sang thuờng

   out.print(t2);

        }

}