java - How to make GUI work in web browser? -

i writing program school final project. wrote whole project frames, find out needs applet. tried converting not work.

source code:

import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.arraylist; import java.applet.applet; public class alteredbattleship extends applet implements actionlistener{   int ro;//holds row input   int co;//holds column input   int[][] shots=new int[10][10];//holds shots taken   boolean displaylose=false;//boolean triggers if game lost   boolean displaywin=false;//boolean triggers if game won   //the next 6 variables hold how many parts of ships haven't been hit   int two=2;   int three=3;   int four=4;   int threetwo=3;   int five=5;   //boolean triggers if boat sunk   boolean twosunk=false;   boolean threesunk=false;   boolean threetwosunk=false;   boolean foursunk=false;   boolean fivesunk=false;   //holds difficulty   boolean b=true;   boolean n=false;   boolean e=false;   arraylist<integer> misses= new arraylist<integer>();//holds missed  shots   arraylist<integer> hits= new arraylist<integer>();//holds hit shots   int shotcount=75;//how many shots player has win   int[][] board=new int[10][10];//holds ship positions   japplet main =new japplet();//holds graphics   textfield input=new textfield(2);//takes input player   textfield count=new textfield(2);//displays shots left   public void actionperformed(actionevent e) {    };   //places 4 long ship   public void placefour(){     int fourstartx=(int)(math.random()*5);     int fourstarty=(int)(math.random()*9);     for(int i=0; i<4; i++){       board[fourstartx+i][fourstarty]=4;     }   }   //places 3 long ship   public void placethree(){     int threestartx=(int)(math.random()*9);     int threestarty=(int)(math.random()*6);     if(board[threestartx][threestarty]==0&& board[threestartx][threestarty+1]==0&&board[threestartx][threestarty+2]==0){       board[threestartx][threestarty]=3;       board[threestartx][threestarty+1]=3;       board[threestartx][threestarty+2]=3;     }     else       this.placethree();   }   //places 2 long ship   public void placetwo(){     int twostartx=(int)(math.random()*7);     int twostarty=(int)(math.random()*9);     if(board[twostartx][twostarty]==0&& board[twostartx+1][twostarty]==0){       board[twostartx][twostarty]=2;       board[twostartx+1][twostarty]=2;     }     else       this.placetwo();   }    //places second 3 long ship   public void placethreetwo(){     int threestartx=(int)(math.random()*6);     int threestarty=(int)(math.random()*9);     if(board[threestartx][threestarty]==0&& board[threestartx+1][threestarty]==0&&board[threestartx+2][threestarty]==0){       board[threestartx][threestarty]=6;       board[threestartx+1][threestarty]=6;       board[threestartx+2][threestarty]=6;     }      else        this.placethreetwo();   }   //places 5 long ship   public void placefive(){     int twostartx=(int)(math.random()*9);     int twostarty=(int)(math.random()*4);     if(board[twostartx][twostarty]==0&& board[twostartx][twostarty+1]==0&& board[twostartx][twostarty+2]==0&& board[twostartx][twostarty+3]==0&& board[twostartx][twostarty+4]==0){       board[twostartx][twostarty]=5;       board[twostartx][twostarty+1]=5;       board[twostartx][twostarty+2]=5;       board[twostartx][twostarty+3]=5;       board[twostartx][twostarty+4]=5;     }      else        this.placefive();   }    //this method creates frame , builds interactable parts of gui   public void init() {     main = new japplet();     drawpanel drawpanel = new drawpanel();     main.add(drawpanel);     jpanel holder=new jpanel();     jpanel line=new jpanel();     jpanel space=new jpanel();     space.setmaximumsize(new dimension(50,150));     space.setbackground(color.lightgray); buttongroup level=new buttongroup();//holds difficulty radiobuttons jradiobutton beginner = new jradiobutton();//beginner difficulty button beginner.setselected(true); beginner.setbackground(color.lightgray); beginner.addactionlistener(new actionlistener() { //makes button set difficulty beginner public void actionperformed(actionevent i) {    b=true;   n=false;   e=false; }  }); space.add(beginner);//adds button panel jradiobutton normal = new jradiobutton();//normal difficulty button normal.setbackground(color.lightgray); space.add(normal);//adds button panel normal.addactionlistener(new actionlistener() { //makes button set difficulty normal public void actionperformed(actionevent i) {    b=false;   n=true;   e=false; }  }); jradiobutton expert = new jradiobutton(); expert.setbackground(color.lightgray); expert.addactionlistener(new actionlistener() {//makes button set difficulty expert  public void actionperformed(actionevent i) {    b=false;   n=false;   e=true; }  }); space.add(expert);//adds button panel level.add(beginner); level.add(normal); level.add(expert); count.seteditable(false); count.settext(integer.tostring(shotcount)); line.setmaximumsize(new dimension(105,100)); line.setbackground(color.lightgray); line.add(count); holder.setlayout(new boxlayout(holder, boxlayout.y_axis));//creates panel holds other panels holder.setmaximumsize(new dimension(20,50)); jpanel inputhold=new jpanel();//creates panel holds input textfield inputhold.setmaximumsize(new dimension(40,100)); inputhold.add(input);//adds textfield panel //makes input take shot , put through program input.addactionlistener(new actionlistener() { public void actionperformed(actionevent e) {    string row=input.gettext().substring(0,1);//makes first letter of input row   string column=input.gettext().substring(1,input.gettext().length());//makes number portion column   ro=row.compareto("a");//makes row number representation   co=integer.parseint(column)-1;//makes string int   if(row.compareto("a")<10 && integer.parseint(column)<=10&&shots[ro][co]==0){//makes sure shot in bounds , not called     if(board[ro][co]==0){//checks miss       misses.add(ro);       misses.add(co);     }     else{//makes sure it's hit       hits.add(ro);       hits.add(co);       if(board[ro][co]==2){//checks if hit 2 ship         two--;         if (two==0)//checks see if 2 sunk           twosunk=true;       }       else if(board[ro][co]==3){//checks if hit 3 ship         three--;         if (three==0)//checks see if 3 sunk           threesunk=true;       }       else if(board[ro][co]==6){//checks if hit other 3 ship         threetwo--;         if(threetwo==0)//checks if other 3 ship sunk           threetwosunk=true;       }       else if(board[ro][co]==4){//check if hit 4 ship         four--;         if (four==0)//check if 4 ship sunk           foursunk=true;       }       else if(board[ro][co]==5){//check if hit 5 ship         five--;         if(five==0)//check if 5 ship sunk           fivesunk=true;       }     }     shotcount--;//takes away shot     shots[ro][co]=1;//remembers spot taken shot   }   if(twosunk&&threesunk&&foursunk&&threetwosunk&&fivesunk){//checks win status     displaywin=true;   }   input.settext("");//resets textfield   //frame.repaint();//resets board new shot   count.settext(integer.tostring(shotcount));//resets shotcount new number   if(shotcount==0){//checks lose status     displaylose=true;     input.seteditable(false);   }  }  }); jpanel spacer=new jpanel(); jbutton newb=new jbutton("new game");//creates new game button newb.addactionlistener(new actionlistener() { //makes button work public void actionperformed(actionevent i) {   //resets variables new game status   displaylose=false;   displaywin=false;   twosunk=false;   threesunk=false;   threetwosunk=false;   foursunk=false;   fivesunk=false;   two=2;   three=3;   threetwo=3;   four=4;   five=5;   misses= new arraylist<integer>();   hits= new arraylist<integer>();   if(b)     shotcount=75;   else if(n)     shotcount=65;   else if(e)     shotcount=50;   count.settext(integer.tostring(shotcount));   board=new int[10][10];   shots=new int[10][10];   placefour();   placethree();   placethreetwo();   placefive();   placetwo();   main.repaint(); }  }); //adds panels frame spacer.add(newb,borderlayout.north); spacer.setbackground(color.lightgray); inputhold.setbackground(color.lightgray); spacer.setbackground(color.lightgray); spacer.setmaximumsize(new dimension(100,32)); holder.add(space,borderlayout.north); holder.add(line,borderlayout.north); holder.add(inputhold, borderlayout.north); holder.add(spacer,borderlayout.south); holder.setbackground(color.lightgray); main.add(holder,borderlayout.east); main.setvisible(true); //places ships this.placefour(); this.placethree(); this.placetwo(); this.placethreetwo(); this.placefive();   } 

and html is: <embed type="application/x-java-applet;version=1.2" code="alteredbattleship.class" width=680 height=400> </embed> i'm sorry if answer obvious new java , extremely new graphics. thank time

you have made mistake.

 public class alteredbattleship extends applet implements actionlistener 

should be:

public class alteredbattleship extends japplet implements actionlistener 

if applet still doesn't works, please inform.