[cellautomaton_ap.java]
--
import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;
/*                                           */
/* セルオートマトン実習解答描画 アプレット版 */
/*                                           */
/* Copyright (C) Junro Yoshino 2000          */
/*                                           */
public class cellautomaton_ap extends Applet implements ItemListener, ActionListener, Runnable{
  private volatile Thread th;
  private boolean threadSuspended;
  Button butn = new Button();
  Choice fig=new Choice();
  int tt;
  int size=9;
  int cell[][]=new int[size][size];

  public void init(){
    int i;
    setstart(0);
    add(butn);
    add(new Label("Figure"));
    for(i=1; i<=3; i=i+1)
      fig.addItem(""+i);
    add(fig);
    fig.addItemListener(this);
    butn.setLabel("start");
    butn.addActionListener(this);
    threadSuspended = true;
    th=new Thread(this);
  }

  public void start(){
    th.start();
  }

  public synchronized void stop(){
    th = null;
    notify();
  }

  public void run(){
    Thread thisThread = Thread.currentThread();
    int c, k;
    while(th == thisThread){
      try{
        thisThread.sleep(100);
        synchronized(this){
          while(threadSuspended)
            wait();
        }
      }catch(InterruptedException e){
      }
      if(tt!=9){
        cycle();
        tt++;
        repaint();
      } 
      else{
        k=fig.getSelectedIndex(); 
        setstart(k);
        butn.setLabel("start");
        threadSuspended = true;
      }
    }
  }

  public synchronized void actionPerformed(ActionEvent e){
    if(!threadSuspended){
      threadSuspended = true;
      butn.setLabel("start");
      repaint();
    } 
    else {
      threadSuspended = false;
      butn.setLabel("stop");
      notify();
    }
  }

  public void itemStateChanged(ItemEvent e){
    int k;
    if(threadSuspended){
      k=fig.getSelectedIndex(); 
      setstart(k);
      repaint();
    }
  }

  public void paint(Graphics g){
    int i, j;
    g.drawString("t="+tt, 40, 40);
    for(j=0; j<size+2; j=j+1)
      g.drawString("_", 56+j*8, 56);
    for(i=0; i<size; i=i+1){
      g.drawString("|", 56, 72+i*16);
      for(j=0; j<size; j=j+1){
        if(cell[i][j]==1)
          g.drawString("+", 64+j*8, 72+i*16);
        else{ 
          if(cell[i][j]==2)
            g.drawString("#", 64+j*8, 72+i*16);
          else
            g.drawString(" ", 64+j*8, 72+i*16);
        }
      }
      g.drawString("|", 64+size*8, 72+i*16);
    }
    for(j=0; j<size+2; j=j+1)
      g.drawString("~", 56+j*8, 72+size*16);
  }

  void cycle(){
    int workcell[][]=new int[size][size], i, j;    
    for(i=0; i<size; i=i+1)
      for(j=0; j<size; j=j+1){
        if(cell[i][j]==2)
          workcell[i][j]=1;
        else{
          if(cell[i][j]==1) 
            workcell[i][j]=0;
          else{
            workcell[i][j]=0;
            if(i!=0)
              if(cell[i-1][j]==2)
                workcell[i][j]=2;
            if(i!=size-1)
              if(cell[i+1][j]==2)
                workcell[i][j]=2;
            if(j!=0)
              if(cell[i][j-1]==2)
                workcell[i][j]=2;
            if(j!=size-1)
              if(cell[i][j+1]==2)
                workcell[i][j]=2;
          }
        } 
      }
    for(i=0; i<size; i=i+1)
      for(j=0; j<size; j=j+1)
        cell[i][j]=workcell[i][j];
  }

  void setstart(int k){
    int i,j;
    tt=0;
    if(k==0){
      for(i=0; i<9; i=i+1)
	for(j=0; j<9; j=j+1)
          cell[i][j]=0;
      cell[4][4]=2;
    } 
    else{ 
      if(k==1){ 
        for(i=0; i<9; i=i+1)
          for(j=0; j<9; j=j+1)
            cell[i][j]=0;
        cell[2][2]=2;
        cell[6][6]=2;
      }
      else {
        for(i=0; i<9; i=i+1)
          for(j=0; j<9; j=j+1)
           cell[i][j]=0;
        for(j=4; j<9; j=j+1){
            cell[3][j]=1;
            cell[4][j]=2;
        }
      }
    }
  }
}

--
Copyright (C) Junro YOSHINO <yoshinok@muf.biglobe.ne.jp>