시스템제어

//2010.7.29 VER1.00
package sms.it;

import java.awt.*;
import java.awt.event.*;

class Exam_02_Sub extends Frame implements ActionListener {
 String str1="========================================================" +"\n"
       +"채팅 방에 오신것을 환영합니다.즐거운 시간되세요!!!!" + "\n"
       + "========================================================"+"\n";
 String str2="[방 참가인원]";
 
 private BorderLayout bl_a=new BorderLayout();
 private BorderLayout bl_change=new BorderLayout();//dlg_change
 private BorderLayout bl_send=new BorderLayout();//dlg_send
 
 private FlowLayout fl_change=new FlowLayout();
 private FlowLayout fl_send=new FlowLayout();
 private FlowLayout fl_send2=new FlowLayout();
 
 private Label label_a=new Label("부산IT직업학교 채팅프로그램입니다.");
 private Label label_color=new Label("색상선택");
 private Label label_change=new Label("바꿀 대화명:");
 private Label label_send1=new Label("대화명:");
 private Label label_send2=new Label("보낼 내용:");
 
 private Panel panel_south=new Panel();
 private Panel panel_north=new Panel();
 private Panel panel_east=new Panel();
 private Panel panel_center=new Panel();
 private Panel panel_south_sub1=new Panel();
 private Panel panel_south_sub2=new Panel();
 private Panel panel_change1=new Panel();//dlg_change
 private Panel panel_change2=new Panel();//dlg_change
 private Panel panel_send1=new Panel();//dlg_send
 private Panel panel_send2=new Panel();//dlg_send
 private Panel panel_send3=new Panel();//dlg_send
 
 private GridLayout gl_south=new GridLayout(2,1);
 private GridLayout glb_change=new GridLayout(2,1);//dlg_change
 private GridLayout glb_send=new GridLayout(3,1);//dlg_send
 
 private Choice choice_whisper=new Choice();
 private Choice choice_color=new Choice();
 
 private TextArea text_center=new TextArea(str1,30,70);
 private TextArea text_east=new TextArea(str2,30,20);
 private TextField text_south=new TextField("",40);
 private TextField text_change=new TextField("",10);
 private TextField text_send1=new TextField("",10);
 private TextField text_send2=new TextField("",40);
 
 private Button btn_eraser=new Button("화면지우기");
 private Button btn_help=new Button("도움말");
 private Button btn_exit=new Button("나가기");
 private Button btn_msg=new Button("쪽지보내기");
 private Button btn_change=new Button("대화명바꾸기");
 private Button btn_end=new Button("방나가기");
 private Button btn_dlg_ok=new Button("완료");
 private Button btn_dlg_cancel1=new Button("취소");
 private Button btn_dlg_send=new Button("보내기");
 private Button btn_dlg_cancel2=new Button("취소하기");
 //Dialog
 private Dialog dlg_change=new Dialog(this,"대화명 바꾸기",true);
 private Dialog dlg_send=new Dialog(this,"쪽지보내기",true);
 
 
 public Exam_02_Sub(String title){
  super(title);
  
  this.init();
  this.start();//event,thread adding
  
  this.setSize(800, 600);
  Dimension screen=Toolkit.getDefaultToolkit().getScreenSize();
  Dimension frm=super.getSize();
  int xpos=(int)(screen.getWidth()/2-frm.getWidth()/2);
  int ypos=(int)(screen.getHeight()/2-frm.getHeight()/2);
  super.setLocation(xpos,ypos);
  super.setResizable(false);
  super.setVisible(true);
 
 }
 public void init(){
    
  this.setLayout(bl_a);
    
  panel_north.add(label_a);
  this.add("North",panel_north);
  panel_north.setBackground(new Color(150,135,0));
  
  panel_south.setLayout(gl_south);
  choice_whisper.add("귓속말선택");
  panel_south_sub1.add(choice_whisper);
  panel_south_sub1.add(text_south);
  panel_south_sub1.add(btn_eraser);
  panel_south_sub1.add(btn_help);
  panel_south_sub1.add(btn_exit);
  panel_south.add(panel_south_sub1);
  panel_south_sub2.add(label_color);
  choice_color.add("빨강");
  choice_color.add("파랑");
  choice_color.add("노랑");
  choice_color.add("녹색");
  panel_south_sub2.add(choice_color);
  panel_south_sub2.add(btn_msg);
  panel_south_sub2.add(btn_change);
  panel_south_sub2.add(btn_end);
  panel_south.add(panel_south_sub2);
  this.add("South",panel_south);
  panel_south.setBackground(new Color(150,135,0));
  
  panel_east.add(text_east);
  this.add("East",panel_east);
  
  
  this.add("Center",text_center);
  
  
  //dialog_change
  dlg_change.setLayout(bl_change);
  panel_change1.setLayout(fl_change);
  panel_change1.add(label_change);
  panel_change1.add(text_change);
  panel_change2.add(btn_dlg_ok);
  panel_change2.add(btn_dlg_cancel1);
  dlg_change.add("North",panel_change1);
  dlg_change.add("South",panel_change2);
  
  //dialog_send
  dlg_send.setLayout(bl_send);
  dlg_send.setLayout(glb_send);
  panel_send1.setLayout(fl_send);
  panel_send2.setLayout(fl_send2);
  panel_send1.add(label_send1,"LEFT");
  panel_send1.add(text_send1);
  panel_send2.add(label_send2);
  panel_send2.add(text_send2);
  panel_send3.add(btn_dlg_send);
  panel_send3.add(btn_dlg_cancel2);
  dlg_send.add("North",panel_send1);
  dlg_send.add("Center",panel_send2);
  dlg_send.add("South",panel_send3);
  
  this.setVisible(true);
  
 }
 public void start(){
  btn_eraser.addActionListener(this);
  btn_help.addActionListener(this);
  btn_exit.addActionListener(this);
  btn_msg.addActionListener(this);
  btn_change.addActionListener(this);
  btn_end.addActionListener(this);
  btn_dlg_ok.addActionListener(this);
  btn_dlg_cancel1.addActionListener(this);
  btn_dlg_send.addActionListener(this);
  btn_dlg_cancel2.addActionListener(this);
  
  this.addWindowListener(new WindowAdapter() {
   public void windowClosing(WindowEvent e){
    System.exit(0);
   }
  });
  dlg_change.addWindowListener(new WindowAdapter() {
   public void windowClosing(WindowEvent e){
    dlg_change.setVisible(false);
   }
  });
  dlg_send.addWindowListener(new WindowAdapter() {
   public void windowClosing(WindowEvent e){
    dlg_send.setVisible(false);
   }
  });
 }
 public void actionPerformed(ActionEvent e){
  if(e.getSource()==btn_eraser){
   
  }
  else if(e.getSource()==btn_help){
   
  }
  else if(e.getSource()==btn_exit){
   System.exit(0);
  }
  else if(e.getSource()==btn_msg){
   dlg_send.setLocation(200, 400);
   dlg_send.setSize(400,160);
   dlg_send.setVisible(true);
  }
  else if(e.getSource()==btn_change){
   dlg_change.setLocation(200, 200);
   dlg_change.setSize(200,120);
   dlg_change.setVisible(true);
  }
  else if(e.getSource()==btn_end){
   
  }
  else if(e.getSource()==btn_dlg_ok){
   
  }
  else if(e.getSource()==btn_dlg_cancel1){
   dlg_change.setVisible(false);
  }
  else if(e.getSource()==btn_dlg_send){
   
  }
  else if(e.getSource()==btn_dlg_cancel2){
   dlg_send.setVisible(false);
  }
  
 }
 
}

public class ChattingProgram {

 public static void main(String[] args) {
  Exam_02_Sub ex=new Exam_02_Sub("채팅 프로그램");

 }

}

//chatting....
import java.awt.*;
import java.awt.event.*;

public class ChattFrame extends Frame {
    private Panel northPanel = new Panel();
    private Panel southPanel = new Panel();
    private Panel eastPanel = new Panel();
    private Panel centerPanel = new Panel();

    public static void main (String[] args) {
 ChattFrame chat=new ChattFrame();
 chat.go();
 
    }
    public void go(){
 
 Frame aframe = new Frame();
  
 aframe.add(BorderLayout.CENTER,centerPanel);
 aframe.add(BorderLayout.NORTH,northPanel);
 //
 aframe.add(BorderLayout.SOUTH,southPanel);
 southPanel.setLayout (new BorderLayout());
 Panel southa = new Panel();
 Panel southb = new Panel();
 southPanel.add(southa,BorderLayout.NORTH);
 southPanel.add(southb,BorderLayout.SOUTH);

 aframe.setSize(800,600);
 aframe.setVisible(true);
 
  // centerPanel에  TextArea생성하여 배치한다.
        //centerPanel.setBackground(Color.WHITE);
 TextArea ta1=new TextArea("////////////// 채팅방에 들어 오신것을 환영합니다 ////////////////",30,60);
 centerPanel.add (ta1);

 // eastPanel 텍스트에리어를 생성하여 배치한다.
        TextArea ta2=new TextArea("[참가인원]",20,20);
 aframe.add(BorderLayout.EAST,ta2);
        
 
 //north 배치
 Label titleLabelnorth = new Label ("부산it직업학교 채팅 프로그램");
 northPanel.setBackground(Color.ORANGE);
        northPanel.setLayout (new FlowLayout());
        northPanel.add (titleLabelnorth);
 
 //south 배치
 //Label titleLabelnorth1 = new Label ("Whisper:");
 southa.setBackground(Color.ORANGE);
        southa.setLayout (new FlowLayout());
        //southa.add (titleLabelnorth1);

 Choice aChoice = new Choice();
 aChoice.add("귓속말선택");
 southa.add(aChoice);

 //southPanel에 TextField 배치
 TextField tf1=new TextField("",50);
 southa.add(tf1);
 
 
 southb.setBackground(Color.yellow);
        southb.setLayout (new FlowLayout());
        //southb.add (titleLabelnorth2);

 //southPanel에 버튼 배치
       Button[] southButton = new Button[7];
        southButton[0] = new Button ("대화방개설");
 southButton[0].addActionListener (new southButtonHandler(southButton[0]));
        southb.add (southButton[0]);
 southButton[1] = new Button ("대화방참여");
 southButton[1].addActionListener (new southButtonHandler(southButton[1]));
        southb.add (southButton[1]);
 southButton[2] = new Button ("대화명변경");
 southButton[2].addActionListener (new southButtonHandler(southButton[2]));
        southb.add (southButton[2]);
 southButton[3] = new Button ("쪽지보내기");
 southButton[3].addActionListener (new southButtonHandler(southButton[3]));
        southb.add (southButton[3]);
 southButton[4] = new Button ("화면지우기");
 southButton[4].addActionListener (new southButtonHandler(southButton[4]));
        southa.add (southButton[4]);
 southButton[5] = new Button ("도움말");
 southButton[5].addActionListener (new southButtonHandler(southButton[5]));
        southa.add (southButton[5]);
 southButton[6] = new Button ("나가기");
 southButton[6].addActionListener (new southButtonHandler(southButton[6]));
        southa.add (southButton[6]);
 Label southLabel1 = new Label ("부산it직업학교 채팅 프로그램");
 southb.add(southLabel1);
    }   
    class southButtonHandler implements ActionListener {
     Button aButton;

     public southButtonHandler (Button paraButton) {aButton = paraButton;}

     public void actionPerformed (ActionEvent e) {
  if(((Button)e.getSource()).getLabel()=="대화방개설"){
   aButton.setBackground (Color.yellow);
  }
  else if(((Button)e.getSource()).getLabel()=="대화방참여"){
   aButton.setBackground (Color.blue);
  }
  else if(((Button)e.getSource()).getLabel()=="대화명변경"){
   aButton.setBackground (Color.yellow);
   
   FlowLayout flow1=new FlowLayout();
   setLayout (flow1);
   
   Label titleLabel2 = new Label ("대화명을 변경합니다");
   TextField chtext=new TextField(20);
          setBackground (Color.red);
   addWindowListener (new WindowHandler());
   add(titleLabel2);
   add(chtext);
   
   setVisible (true);
  }
  else if(((Button)e.getSource()).getLabel()=="쪽지보내기"){
   aButton.setBackground (Color.orange);
  }
  else if(((Button)e.getSource()).getLabel()=="화면지우기"){
   aButton.setBackground (Color.green);
  }
  else if(((Button)e.getSource()).getLabel()=="도움말"){
   aButton.setBackground (Color.yellow);
  }
  else if(((Button)e.getSource()).getLabel()=="나가기"){
   aButton.setBackground (Color.red);
   System.exit(0);

  }
  
     }
 
   
    } 
    // 윈도우를 닫기위한 이벤트 청취자
    class WindowHandler extends WindowAdapter {
        public void windowClosing (WindowEvent e) {
            if (e.getID() == WindowEvent.WINDOW_CLOSING) {
                setVisible (false);
                System.exit (0);
            }
        }
    }

}

/* Panel을 이용하여 화면을 배치하는 프로그램. 화면은 BorderLayout으로 설정된다. 각 영역은 Panel 객체를 이용하여 다시 각각 독립적인 구성으로 배치한다. */

import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

public class ChattingPanel extends Applet {
    // 패널을 생성한다.
    private Panel northPanel = new Panel();
    private Panel southPanel = new Panel();
    private Panel eastPanel = new Panel();
    private Panel centerPanel = new Panel();
   

    public void init() {
        BorderLayout aBorder = new BorderLayout();
        setLayout (aBorder);

        //  패널을 윈도우에 배치한다.
        add (northPanel, BorderLayout.NORTH);
        add (southPanel, BorderLayout.SOUTH);
 add (eastPanel, BorderLayout.EAST);
        add (centerPanel, BorderLayout.CENTER);
    

 // northPanel에 Labele 을 생성
 Label titleLabelnorth = new Label ("부산it직업학교 채팅 프로그램");
 northPanel.setBackground(Color.ORANGE);
        northPanel.setLayout (new FlowLayout());
        northPanel.add (titleLabelnorth);

        // centerPanel에  TextArea생성하여 배치한다.
        centerPanel.setLayout (new BorderLayout());
 centerPanel.setBackground(Color.WHITE);
 TextArea ta1=new TextArea("////////////// 채팅방에 들어 오신것을 환영합니다 ////////////////");
 //Button centerCButton = new Button ("Center Button");
        centerPanel.add (ta1, BorderLayout.CENTER);

        // southPanel에 Choice 배치한다.
 //FlowLayout aFlow = new FlowLayout();
        //southPanel.setLayout (aFlow);

 Choice aChoice = new Choice();
 aChoice.add("귓속말선택");
 southPanel.add(aChoice);
 
 //southPanel에 TextField 배치
 TextField tf1=new TextField("",50);
 southPanel.add(tf1,BorderLayout.SOUTH);
 southPanel.setBackground(Color.ORANGE);
 GridLayout aGrid = new GridLayout (2,1);
        southPanel.setLayout (aGrid );

 //southPanel에 버튼 배치
       Button[] southButton = new Button[7];
        southButton[0] = new Button ("대화방개설");
 southButton[0].addActionListener (new southButtonHandler(southButton[0]));
        southPanel.add (southButton[0]);
 southButton[1] = new Button ("대화방참여");
 southButton[1].addActionListener (new southButtonHandler(southButton[1]));
        southPanel.add (southButton[1]);
 southButton[2] = new Button ("대화명변경");
 southButton[2].addActionListener (new southButtonHandler(southButton[2]));
        southPanel.add (southButton[2]);
 southButton[3] = new Button ("쪽지보내기");
 southButton[3].addActionListener (new southButtonHandler(southButton[3]));
        southPanel.add (southButton[3]);
 southButton[4] = new Button ("화면지우기");
 southButton[4].addActionListener (new southButtonHandler(southButton[4]));
        southPanel.add (southButton[4]);
 southButton[5] = new Button ("도움말");
 southButton[5].addActionListener (new southButtonHandler(southButton[5]));
        southPanel.add (southButton[5]);
 southButton[6] = new Button ("나가기");
 southButton[6].addActionListener (new southButtonHandler(southButton[6]));
        southPanel.add (southButton[6]);
 Label southLabel1 = new Label ("부산it직업학교 채팅 프로그램");
 southPanel.add(southLabel1);

        // eastPanel 텍스트에리어를 생성하여 배치한다.
        eastPanel.setLayout (new GridLayout ());
 TextArea ta2=new TextArea("[참가인원]",20,20);
        eastPanel.add (ta2,BorderLayout.EAST);
          
    }

    class southButtonHandler implements ActionListener {
     Button aButton;

     public southButtonHandler (Button paraButton) {aButton = paraButton;}

     public void actionPerformed (ActionEvent e) {
  if(((Button)e.getSource()).getLabel()=="대화방개설"){
   aButton.setBackground (Color.yellow);
  }
  else if(((Button)e.getSource()).getLabel()=="대화방참여"){
   aButton.setBackground (Color.blue);
  }
  else if(((Button)e.getSource()).getLabel()=="대화명변경"){
   aButton.setBackground (Color.yellow);
   
   
  }
  else if(((Button)e.getSource()).getLabel()=="쪽지보내기"){
   aButton.setBackground (Color.orange);
  }
  else if(((Button)e.getSource()).getLabel()=="화면지우기"){
   aButton.setBackground (Color.green);
  }
  else if(((Button)e.getSource()).getLabel()=="도움말"){
   aButton.setBackground (Color.yellow);
  }
  else if(((Button)e.getSource()).getLabel()=="나가기"){
   aButton.setBackground (Color.red);
   System.exit(0);

  }
     }
   
    }
 
}

// GridBagLayout을 이용하여 계산기 프로그램

import java.awt.*;
import java.awt.event.*;

public class Calculator extends Frame{
 GridBagLayout layout = new GridBagLayout();
 GridBagConstraints constraints = new GridBagConstraints();
 Button b0, b1, b2, b3, b4, b5, b6, b7, b8, b9,
        bPlus, bMinus, bMul, bDiv, bEqual, bClear, bDot;
        Label T1;
   

   public static void main (String[] args) {
         Calculator aWindow = new Calculator ();
 }//메인끗

 public Calculator () {
        setTitle ("GridBagLayout Window");
        setLayout (layout);
 
        constraints.fill = GridBagConstraints.BOTH;
        constraints.insets = new Insets (5, 5, 5, 5);
        constraints.weightx = constraints.weighty = 1.0;
     
        //버튼을 생성하여 위치를 정한 다음, addComponent()를 호출한다.
 T1 =  new Label("",Label.RIGHT);

 addComponent (0, 0, 4, 1, T1);

        addComponent (0, 1, 1, 1, bClear = new Button ("CL"));

        addComponent (0, 2, 1, 1, b1 = new Button ("1"));

        addComponent (0, 3, 1, 1, b4 = new Button ("4"));
        addComponent (0, 4, 1, 1, b7 = new Button ("7"));
        addComponent (0, 5, 2, 1, b0 = new Button ("0"));

        addComponent (1, 1, 1, 1, bDiv = new Button ("/"));
        addComponent (1, 2, 1, 1, b2 = new Button ("2"));
        addComponent (1, 3, 1, 1, b5 = new Button ("5"));
        addComponent (1, 4, 1, 1, b8 = new Button ("8"));
     
        addComponent (2, 1, 1, 1, bMul = new Button ("*"));
        addComponent (2, 2, 1, 1, b3 = new Button ("3"));
        addComponent (2, 3, 1, 1, b6 = new Button ("6"));
        addComponent (2, 4, 1, 1, b9 = new Button ("9"));
        addComponent (2, 5, 1, 1, bDot = new Button ("."));
     
        addComponent (3, 1, 1, 1, bMinus = new Button ("-"));
        addComponent (3, 2, 1, 2, bPlus = new Button ("+"));
        addComponent (3, 4, 1, 2, bEqual = new Button ("="));

 bClear.addActionListener(new scaButtonHandler(T1));
 b1.addActionListener(new scaButtonHandler(T1));
 b2.addActionListener(new scaButtonHandler(T1));
 b3.addActionListener(new scaButtonHandler(T1));
 b4.addActionListener(new scaButtonHandler(T1));
 b5.addActionListener(new scaButtonHandler(T1));
 b6.addActionListener(new scaButtonHandler(T1));
 b7.addActionListener(new scaButtonHandler(T1));
 b8.addActionListener(new scaButtonHandler(T1));
 b9.addActionListener(new scaButtonHandler(T1));
 b0.addActionListener(new scaButtonHandler(T1));
 bDot.addActionListener(new scaButtonHandler(T1));

 bMul.addActionListener(new scaButtonHandler(T1));
 bPlus.addActionListener(new scaButtonHandler(T1));
 bMinus.addActionListener(new scaButtonHandler(T1));
 bDiv.addActionListener(new scaButtonHandler(T1));
 T1.setText("0");
 bEqual.addActionListener(new scaButtonHandler(T1));
 FlowLayout Flow1 = new FlowLayout();
 Flow1.setAlignment(FlowLayout.RIGHT);
        addWindowListener (new WindowHandler());
        setBounds (10,10,250,300);
        setVisible (true);
    }//생성자 끗
 
    // 인수로 컴포넌트와 위치를 넘겨받아, 윈도우에 추가한다.
    public void addComponent (int x, int y, int w, int h, Component theComponent) {
        constraints.gridx = x;
        constraints.gridy = y;
        constraints.gridwidth = w;
        constraints.gridheight = h;
        layout.setConstraints (theComponent, constraints);
        add (theComponent);
    }

    class WindowHandler extends WindowAdapter {
        public void windowClosing (WindowEvent e) {
            setVisible (false);
            dispose();
            System.exit (0);
        }
    }

 int FirstValue=0;
 int SecondValue=0;
 int TempValue=0;

}//calculator끗

/*
class ButtonControl implements ActionListener{
   public void actionPerformed(ActionEvent ae){
 
  T1.setText(T1.getText() + ((Button)ae.getSource()).getLabel() );

    }//액션펄폼드끗
}//버튼콘트롤 끗/
*/

class scaButtonHandler implements ActionListener{
   Label T1;
   String StText=new String("0");

   static Double TempNumber = new Double(0);
   static Double FirstNumber = new Double(0);
   static Double SecondNumber = new Double(0);
   static Double ReseltNumber = new Double(0);
   static int iReseltNumber = 0;
   static char oper = 0;
   static int swit = 0;
   static int lapperswit = 0;
   static int Reselt=0;
   scaButtonHandler(Label paraField){
 T1 = paraField;
   }
   Double Lapper(Double FNmb,Double SNmb,char oper){
 if(oper == '+'){
  return (FNmb+SNmb);
 }
 else if(oper == '-'){
  return (FNmb-SNmb);
 }
 else if(oper == '/'){
  if(SNmb==0) return 0.0;  
  else return (FNmb/SNmb);
 }
 else if(oper == '*'){
  return (FNmb*SNmb);
 }
 return 0.0;
   }
   public void actionPerformed(ActionEvent ae){

  if(((Button)ae.getSource()).getLabel()=="="){
    
    if(FirstNumber==0) ReseltNumber = Lapper(ReseltNumber,SecondNumber,oper);
    else
    {
     SecondNumber = Double.parseDouble(T1.getText());
     ReseltNumber = Lapper(FirstNumber,SecondNumber,oper);
    }
    FirstNumber = 0.0;
    if(ReseltNumber%1==0) T1.setText(ReseltNumber.intValue()+"");
    else T1.setText(ReseltNumber+"");
    Reselt=1;
  }
  else if(((Button)ae.getSource()).getLabel()=="+"){
   if(FirstNumber == 0)
   {
    FirstNumber = Double.parseDouble(T1.getText());
    lapperswit=1;
    T1.setText("0");
    oper = '+';
    swit = 0;
   }
   else
   {
    if(lapperswit==0)
    {
     SecondNumber = Double.parseDouble(T1.getText()); 
     FirstNumber = Lapper(FirstNumber,SecondNumber,oper);
     if(FirstNumber%1==0) T1.setText(FirstNumber.intValue()+"");
     else T1.setText(FirstNumber+"");
     lapperswit=1;
     oper = '+';
    }
   }
  }
  else if(((Button)ae.getSource()).getLabel()=="-"){
   if(FirstNumber == 0)
   {
    FirstNumber = Double.parseDouble(T1.getText());
    lapperswit=1;
    T1.setText("0");
    oper = '-';
    swit = 0;
   }
   else
   {
    if(lapperswit==0)
    {
     SecondNumber = Double.parseDouble(T1.getText()); 
     FirstNumber = Lapper(FirstNumber,SecondNumber,oper);
     if(FirstNumber%1==0) T1.setText(FirstNumber.intValue()+"");
     else T1.setText(FirstNumber+"");
     lapperswit=1;
     oper = '-';
    }
   }
  }
  else if(((Button)ae.getSource()).getLabel()=="*"){
   if(FirstNumber == 0)
   {
    FirstNumber = Double.parseDouble(T1.getText());
    lapperswit=1;
    T1.setText("0");
    oper = '*';
    swit = 0;
   }
   else
   {
    if(lapperswit==0)
    {
     SecondNumber = Double.parseDouble(T1.getText()); 
     FirstNumber = Lapper(FirstNumber,SecondNumber,oper);
     if(FirstNumber%1==0) T1.setText(FirstNumber.intValue()+"");
     else T1.setText(FirstNumber+"");
     lapperswit=1;
     oper = '*';
    }
   }
  }
  else if(((Button)ae.getSource()).getLabel()=="/"){
   if(FirstNumber == 0)
   {
    FirstNumber = Double.parseDouble(T1.getText());
    lapperswit=1;
    T1.setText("0");
    oper = '/';
    swit = 0;
   }
   else
   {
    if(lapperswit==0)
    {
     SecondNumber = Double.parseDouble(T1.getText()); 
     FirstNumber = Lapper(FirstNumber,SecondNumber,oper);
     if(FirstNumber%1==0) T1.setText(FirstNumber.intValue()+"");
     else T1.setText(FirstNumber+"");
     lapperswit=1;
     oper = '/';
    }
   }   
  }
  // "."을 눌럿을경우
  else if(((Button)ae.getSource()).getLabel()=="."){
   if(swit==0)
   {
    T1.setText(T1.getText() +((Button)ae.getSource()).getLabel()+"0");
    swit = 1;
   }
  }
  // "CL"을 눌럿을경우
  else if(((Button)ae.getSource()).getLabel()=="CL"){
   T1.setText("0");
   swit = 0;
   lapperswit=0;
   TempNumber = 0.0;
   FirstNumber = 0.0;
   SecondNumber = 0.0;
   ReseltNumber =  0.0;;
   TempNumber = Double.parseDouble(T1.getText());
  }
  // 숫자를 눌럿을경우
  else if(((Button)ae.getSource()).getLabel()=="0"){
   if(Double.parseDouble(T1.getText())!=0)
   {
    T1.setText(T1.getText() +((Button)ae.getSource()).getLabel());
    TempNumber = Double.parseDouble(T1.getText());
   }
  }
  else
  {
   if(Reselt==1)
   {
    T1.setText("0");
    Reselt=0;
   }
   if(lapperswit==1)
   {
    T1.setText("0");
    lapperswit=0;
   }
   if(Double.parseDouble(T1.getText())!=0)
   {
    if((Double.parseDouble(T1.getText())%1)==0)
    {
     if(swit==1)
     {    
      T1.setText((int)(Double.parseDouble(T1.getText())/1) +"."+((Button)ae.getSource()).getLabel());
      TempNumber = Double.parseDouble(T1.getText()); 
     }
     else
     {
      T1.setText(T1.getText()+((Button)ae.getSource()).getLabel());
      TempNumber = Double.parseDouble(T1.getText());
     }  
    }
    else
    {
     T1.setText(T1.getText()+((Button)ae.getSource()).getLabel());
     TempNumber = Double.parseDouble(T1.getText());
    } 
   }
   else
   {
    if(swit==1)
    {
     T1.setText("0." +((Button)ae.getSource()).getLabel());
     TempNumber = Double.parseDouble(T1.getText()); 
    }    
    else
    {
     T1.setText(((Button)ae.getSource()).getLabel());
     TempNumber = Double.parseDouble(T1.getText());   
    }
   }
  }
    
  
    }//액션펄폼드끗

}//버튼콘트롤 끗/

3번문제) 계산기프로그램으로써 사용자로부터 두수를 입력받고 연산값을 입력받아 해당 결과를    제출하는 프로그램을 짜라. (5번을 선택할 때까지 프로그램은 계속된다...)


import java.io.*;

class OperExm{
 public static void main(String args[]) throws IOException{

  System.out.println("메뉴에서 고르세요 ~~~~");
  System.out.println("1.덧셈");
  System.out.println("2.뺄셈");
  System.out.println("3.곱셈");
  System.out.println("4.나눗셈");
  System.out.println("5.나가기");

  BufferedReader stdin=new BufferedReader
    (new InputStreamReader(System.in));
  int num1,num2,choose;
  
  System.out.print("Enter the number : ");

  while(true){
  choose = Integer.parseInt (stdin.readLine());

  
  System.out.print("Enter the first number : ");
   num1 = Integer.parseInt (stdin.readLine());

         System.out.print ("Enter the second number : ");
         num2 = Integer.parseInt (stdin.readLine());

         switch(choose){
  case 1:
   System.out.println(num1+"+"+num2+"="+(num1+num2));
   break;
  case 2:
   System.out.println(num1+"-"+num2+"="+(num1-num2));
   break;
  case 3:
   System.out.println(num1+"*"+num2+"="+(num1*num2));
   break;
  case 4:
   System.out.println(num1+"/"+num2+"="+(num1/num2));
   break;

  }//switch
  System.out.println();
 
  System.out.println("메뉴에서 고르세요 ~~~~");
  System.out.println("1.덧셈");
  System.out.println("2.뺄셈");
  System.out.println("3.곱셈");
  System.out.println("4.나눗셈");
  System.out.println("5.나가기");

  System.out.print("Enter the number : ");
  choose = Integer.parseInt (stdin.readLine());
  if(choose==5){
   break;
  }
  
  }//While
 }//main

}//OperExm

2번문제) 구구단 출력 시켜라
===================================
import java.io.*;
import java.lang.*;

class Gugudan{
 public static void main(String[] args){
 // for(int i=2;i<=9;++i)
 // {
 int i=2;
   for(int j=1;9>=j;++j)
   {
    for(int k=0;k<8;++k){
    //System.out.print((i+k)+"*"+j+"="+((i+k)*j)+"  ");
    System.out.printf("%d*%d=%2d ",(i+k),j,((i+k)*j));
    }//int k
    System.out.println();
   }//int j
   System.out.println();
 // }//int i 

 }//main

}//class