My bloggy

5.28.2019

[JAVA] Graphic Programming - Panel

import javax.swing.*;
import java.awt.*;

public class CirclesDemo extends JFrame {
    public CirclesDemo() {
        setTitle("xxx");

        class MyPanel extends JPanel {
            @Override            protected void paintComponent(Graphics g) {
                super.paintComponent(g);
                Color[] colors = {
                        Color.RED, Color.ORANGE, Color.YELLOW, Color.GREEN, Color.BLUE,
                        new Color(0x000080), new Color(0x800080)
                };
                for(int i = 0; i < 7; i++) {
                    int d = delta(i);
                    g.setColor(colors[i]);
                    g.drawOval(10 + d, 10 + d, 240 - 2 * d, 240 - 2 * d); //coordinator x, y, 지름이 양쪽에 있으니 -2*d                }
            }

            int delta(int x) { //square 속 circles 간의 간격                double diagonal = Math.sqrt(240 * 240);
                return (int)(diagonal *  x * 15 / 240); //15 is usual            }
        }

        add(new MyPanel()); //new JPanel로 무명 클래스 만들 수도 있음        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setSize(300,300);
        setVisible(true);

    }

    public static void main(String[] args) {
        new CirclesDemo();
    }
}

2.02.2018

TCP/IP advanced

1. Make two Java Projects (Name one ServerProgram, and the other, ClientProgram)
2. Make three classes for each (ex. Server.java // SendThread.java // ReceiveThread.java)

<Server.java code>
import java.net.ServerSocket;
import java.net.Socket;

public class Server {

public static void main(String[] args) {
// TODO Auto-generated method stub
ServerSocket serverSocket = null;
Socket socket = null;

try {
serverSocket = new ServerSocket(5050);
System.out.println("***채팅방이 열렸습니다***");
System.out.println("기다리는 중...\n");
socket = serverSocket.accept(); // method를 사용하여 client로부터 연결 요청을 기다리고 요청이 오면 연결을 맺은 후 소켓을 생성함
System.out.println("상대방이 입장했습니다.");

SendThread st = new SendThread(socket);
ReceiveThread rt = newReceiveThread(socket);
st.start();
rt.start();
} catch (Exception e) {

} finally {
try {
// socket.close(); // 소켓을 닫는다.
serverSocket.close(); // 서버소켓을 닫는다.
} catch (Exception e) {

}
}
}
}

========================================================================

<Client.java code>

import java.net.Socket;

public class Client {

  public static void main(String[] args) {
  // TODO Auto-generated method stub
Socket socket = null;

try {
socket = new Socket("210.125.97.125", 5050);
System.out.println("***채팅방에 들어왔습니다***");

SendThread st = new SendThread(socket);
ReceiveThread rt = new ReceiveThread(socket);
st.start();
rt.start();

} catch (Exception e) {
} finally {
try {
      // socket.close();

} catch (Exception e) {

}
}
}

}

========================================================================

<SendThread.java code>

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class SendThread extends Thread {

Socket socket = null;

SendThread(Socket socket) {
      this.socket = socket;
}

public void run() {

      try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
// system.in을 이용하여 console창에 입력함.

PrintWriter writer = new PrintWriter(socket.getOutputStream());
// socket.getOutputStream을 통해 소켓의 출력 스트림을 가져온다. client로 data 보낼 수 있다.

// 데이터를 계속 주고받을 수 있도록
while (true) {
        String str = reader.readLine();

      if (str.equals("BYE")) {
break;
        }
        writer.println(str); // 한 행의 byte data를 쓴다.
  writer.flush();

}
} catch (Exception e) {

} finally {
try {
socket.close();
} catch (Exception e) {
}
}
}
}

========================================================================

<ReceiveThread.java code>

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.Socket;

public class ReceiveThread extends Thread {
Socket socket = null;

ReceiveThread(Socket s) {
  socket = s;
}

public void run() {
      try {
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

while (true) {
String str = reader.readLine();

if (str == null)
break;

System.out.println(str);
}
      } catch (Exception e) {
      }
}
}

TCP/IP Programming - ClientProgram

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;

public class Client {

public static void main(String[] args) {
// TODO Auto-generated method stub
  Socket socket = null;

  try {
socket = new Socket("127.0.0.1", 5050);
  System.out.println("***채팅방에 들어왔습니다***");

  BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));

  PrintWriter writer = new PrintWriter(socket.getOutputStream());

  writer.println("Hi, I'm client!");
  writer.flush();

  System.out.println(reader.readLine());
  } catch (Exception e) {
  } finally {
  try {
  socket.close();

  } catch (Exception e) {

  }
  }
}

}

TCP/IP Programming - ServerProgram

import java.io.BufferedReader;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

public static void main(String[] args) {

// TODO Auto-generated method stub

ServerSocket serverSocket = null;

Socket socket = null;

try {

serverSocket = new ServerSocket(5050);

System.out.println("***채팅방이 열렸습니다***");

System.out.println("기다리는 중...\n");

socket = serverSocket.accept(); // method를 사용하여 client로부터 연결 요청을 기다리고 요청이 오면 연결을 맺은 후 소켓을 생성함

System.out.println("상대방이 입장했습니다.");

BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream())); // socket.getInputStream을 통해 소켓의 입력 stream을 가져온다. 이를 통해 client가 보낸 data를 읽어 올 수 있다.

PrintWriter writer= new PrintWriter(socket.getOutputStream()); // socket.getOutputStream을 통해 소켓의 출력 스트림을 가져온다. client로 data 보낼 수 있다.

System.out.println(reader.readLine()); // 읽어 온 한 행의 문자열 데이터를 출력한다.

writer.println("Hi, I'm server!"); // 한 행의 byte data를 쓴다.

writer.flush(); // 버퍼가 다 찬 후 한꺼번에 데이터를 보내기 때문에 이를 기다리지 않고 바로 보내기 위해서 flush() method를 사용한다.

} catch (Exception e) {

} finally {

try {

socket.close(); // 소켓을 닫는다.

serverSocket.close(); // 서버소켓을 닫는다.

} catch (Exception e) {

}

MultiThread

class AlarmThread extends Thread { // 1초마다 알림 울리기
  public void run() {
  int i = 1;
while (true) {
  try {
      Thread.sleep(1000);
} catch (Exception e) {
      System.out.println(e);
}
  if (i == 10) {
      System.out.println("\t10seconds!");
      break;
} else {
      System.out.println("\t" + i + "초");
}
i++;
}
}
}

class PlusThread extends Thread {
public void run() {
      int sum = 0;
      for (int i = 0; i < 100; i++) {
          sum += i;
      }
      System.out.println(sum);
}
}

public class PrintAlphabet extends Thread {
int alphabet = 26;

public void run() {
      // print alphabet
      for (int i = 0; i < alphabet; i++) {
            System.out.println((char) ('A' + i));
          try {
              Thread.sleep(500); // 일시중지하는 명령어로 인자에 값을 넣어주면, 넣은 값만큼 시간을 지연시킨 후에 다음 명령을 실행
          } catch (Exception e) {
                System.out.println(e);
          }
      }
}

public static void main(String[] args) {
      // TODO Auto-generated method stub
PrintAlphabet pa = new PrintAlphabet();
AlarmThread at = new AlarmThread();
PlusThread pt = new PlusThread();

pa.start();
at.start();
pt.start();
}

}

2.01.2018

JAVA Traffic2

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.border.LineBorder;

public class SignalLamp extends JFrame {
SignalLamp() {
setTitle("TRAFFIC");
setSize(200, 500);
setLayout(null);

  // JPanel
JPanel trafficPanel= new JPanel();
  trafficPanel.setBorder(new LineBorder(Color.black, 3));
  trafficPanel.setLayout(null);
  trafficPanel.setLocation(34, 30);
  trafficPanel.setSize(120, 360);
  trafficPanel.setBackground(Color.black);

this.add(trafficPanel);

    // JLabel - red signal
ImageIcon redImg = new ImageIcon("img/red.png");
final JLabel red = new JLabel(redImg); //final을 붙이면 값이 고정됨
  red .setHorizontalAlignment(SwingConstants.CENTER);
  red.setBorder(new LineBorder(Color.black, 1));
  red.setLocation(0, 0);
  red.setSize(120, 120);

  trafficPanel.add(red);

    // JLabel - yellow signal
ImageIcon yellowImg = new ImageIcon("img/yellow.png");
  final JLabel yellow = new JLabel(yellowImg);
  yellow.setHorizontalAlignment(SwingConstants.CENTER);
  yellow.setBorder(new LineBorder(Color.black, 1));
  yellow.setLocation(0, 400);
  yellow.setSize(120, 120);

  trafficPanel.add(yellow);

    // JLabel - green signal
ImageIcon greenImg = new ImageIcon("img/green.png");
JLabel green = new JLabel(greenImg);
  green.setHorizontalAlignment(SwingConstants.CENTER);
  green.setBorder(new LineBorder(Color.black, 1));
  green.setLocation(0, 240);
  green.setSize(120, 120);

  trafficPanel.add(green);

//JLabel - no signal
ImageIcon nosignalImg = new ImageIcon("img/nosignal.png");
JLabel nosignal= new JLabel(nosignalImg);
  nosignal.setHorizontalAlignment(SwingConstants.CENTER);
  nosignal.setBorder(new LineBorder(Color.black, 1));
  nosignal.setSize(120, 120);

  trafficPanel.add(nosignal);

  // JPanel buttonPanel
JPanel buttonPanel = new JPanel();

  buttonPanel.setLayout(null);
  buttonPanel.setLocation(34, 400);
  buttonPanel.setSize(120, 30);

  this.add(buttonPanel);

  // button
JButton button = new JButton("Change Signal");
  button.setLocation(0, 0);
  button.setSize(120, 30);

  buttonPanel.add(button);

button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//System.out.println(red.getIcon().toString());
if (red.getIcon().toString().equals("img/red.png")){ //
  red.setIcon(nosignalImg);
  yellow.setIcon(yellowImg);
} else if (red.getIcon().toString().equals("img/red.png")){ //
   yellow.setIcon(nosignalImg);
  green.setIcon(greenImg);
} else if (red.getIcon().toString().equals("img/red.png")){ //
red.setIcon(nosignalImg);
  yellow.setIcon(yellowImg);
}
}
});

//button.addActionListener(new MyActionListener(red))
buttonPanel.add(button);

setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}

public static void main(String[] args) {
// TODO Auto-generated method stub
SignalLamp sl = new SignalLamp();
}

}

JAVA traffic

import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.border.LineBorder;

public class SignalLamp extends JFrame {
SignalLamp() {
setTitle("TRAFFIC");
setSize(200, 500);
setLayout(null);

// JPanel
JPanel trafficPanel = new JPanel();
trafficPanel.setBorder(new LineBorder(Color.black, 3));
trafficPanel.setLayout(null);
trafficPanel.setLocation(34, 30);
trafficPanel.setSize(120, 360);
  trafficPanel.setBackground(Color.black);

this.add(trafficPanel);

// JLabel - red signal
ImageIcon redImg = new ImageIcon("img/red.png");
JLabel red = new JLabel(redImg);
red.setText("RED");
  red.setHorizontalAlignment(SwingConstants.CENTER);
  red.setBorder(new LineBorder(Color.black, 1));
  red.setLocation(0, 0);
  red.setSize(120, 120);

trafficPanel.add(red);

// JLabel - yellow signal
ImageIcon yellowImg = new ImageIcon("img/yellow.png");
JLabel yellow = new JLabel(yellowImg);
yellow.setText("YELLOW");
  yellow.setHorizontalAlignment(SwingConstants.CENTER);
  yellow.setBorder(new LineBorder(Color.black, 1));
  yellow.setLocation(0, 400);
  yellow.setSize(120, 120);

trafficPanel.add(yellow);

// JLabel - green signal
ImageIcon greenImg = new ImageIcon("img/green.png");
JLabel green = new JLabel(greenImg);
green.setText("GREEN");
  green.setHorizontalAlignment(SwingConstants.CENTER);
  green.setBorder(new LineBorder(Color.black, 1));
  green.setLocation(0, 240);
  green.setSize(120, 120);

  trafficPanel.add(green);

// JPanel buttonPanel
JPanel buttonPanel = new JPanel();

  buttonPanel.setLayout(null);
  buttonPanel.setLocation(34, 400);
  buttonPanel.setSize(120, 30);

this.add(buttonPanel);

// button
JButton button = new JButton("Change Signal");
button.setLocation(0, 0);
  button.setSize(120, 30);

  buttonPanel.add(button);

setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}

public static void main(String[] args) {
// TODO Auto-generated method stub
SignalLamp sl = new SignalLamp();
}

}