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JApplet 클래스와 JFC 고급 클래스 활용1 - JApplet 클래스

추상작업 2020. 9. 19. 12:40

JApplet 클래스를 이용한 애플릿 구현

Applet 클래스와 JApplet 클래스의 차이점

  • 사용할 수 있는 범위
    • Applet : 보안과 관련된 부분에서 예외가 많이 발생
    • JApplet : 로컬시스템과 결합하기 전까지 예외가 발생하지 않음

주의할 점

  • 그래픽을 표현할 때 paint()라는 메서드를 JApplet을 상속받은 클래스와 함께 쓰지 말아야 한다.
  • Canvas와 같이 그래픽을 표현할 수 있는 다른 클래스의 도움을 받아 표시하는 것이 좋다.

JApplet 그래픽 표현 예제

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

class Round23_Ex01_Sub extends Canvas {
    public void paint(Graphics g) { 
        g.drawLine(50, 50, 100, 100);
        g.setColor(Color.red);
        g.fillRect(100, 100, 50, 50);
    }
}

public class Round23_Ex01 extends JApplet {
    private Container con;
    private JPannel jp = new JPannel(new FlowLayout(FlowLayout.RIGHT));
    private JButton bt = new JButton("확인");
    private JButton bt1 = new JButton("취소");
    private Round23_Ex01_Sub es = new Round23_Ex01_Sub();
    
    public void init() {
        con = this.getContentPane();
        con.setLayout(new BorderLayout());
        jp.add(bt);
        jp.add(bt1);
        con.add("South", jp);
        con.add("Center", es);
    }
    
    public void start() {
    
    }
    
    public void stop() {
    
    }
    
    public void destroy() {
    
    }
}

Round23_Ex01.html

<html>
  <head>
    <!-- header - edit "Data/yourHtmlHeader" to customize -->
    <!-- contents - edit "EventHandlers/Html file/onCreate" to customize -->
    <meta name="generator" content="ModelWorks IDE" />
    <title></title>
  </head>
  <body>
    <center>
      <p>이것이 JApplet 입니다.</p>
      <applet code="Round23_Ex01.class" width=300 height=200 ></applet>
      <hr>
      <a href="Round23_Ex01.java">소스보기</a>
    </center>
  </body>
</html>

 

JApplet 으로 JMenu 구현

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


public class Round23_Ex02 extends JApplet implements ActionListener {

    private JMenuBar jmb = new JMenuBar();
    private JMenu file = new JMenu("File");
    private JMenu help = new JMenu("Help");
    private JMenuItem fnew = new JMenuItem("New File");
    private JMenuItem fstop = new JMenuItem("Stop");

    public void init() {
        this.setJMenuBar(jmb);
        jmb.add(file);
        jmb.add(help);
        fnew.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_N, InputEvent.CTRL_MASK));
        fstop.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_S, InputEvent.CTRL_MASK));
        
        file.add(fnew);
        file.addSeparator();
        file.add(fstop);
        
    }
    
    public void start() {
        fnew.addActionListener(this);
    }
    
    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == fnew) {
            this.showStatus("New File 키를 눌렀습니다.");// 상태바에 문자열 띄우기
        }
    }

}

Round23_Ex02.html

<html>
  <head>
    <!-- header - edit "Data/yourHtmlHeader" to customize -->
    <!-- contents - edit "EventHandlers/Html file/onCreate" to customize -->
    <meta name="generator" content="ModelWorks IDE" />
    <title></title>
  </head>
  <body>
    <center>
      <applet code="Round23_Ex02.class" width=300 height=200 ></applet>
    </center>
  </body>
</html>

 

아날로그 시계와 디지털 시계

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;


public class Round23_Ex03_Sub extends Canvas implements Runnable {
    
    private Thread timeThread;
    private int h, m, s; // 시 분 초의 값을 기억
    private xh, yh, xm, ym, xs, ys; // 현재의 시 분 초의 좌표를 기억
    private xh1, yh1, xm1, ym1, xs1, ys1; // 바로 이전의 시 분 초의 좌표를 기억
    
    private int xcenter = 100; // 중심점의 x좌표
    private int ycenter = 100; // 중심점의 y좌표
    
    public Round23_Ex03_Sub() {
        timeThread = new Thread(this);
        timeThread.start();
    }
    
    public void updatge(Graphics g) {
        paint(g);
    }
    
    public void paint(Graphics g) {
        Calendar ca = Calendar.getInstance();
        
        h = (int)ca.get(Calendar.HOUR_OF_DAY); // new Date().getHours();
        m = (int)ca.get(Calendar.MINUTE);
        s = (int)ca.get(Calendar.SECOND);
        
        xh = (int)(Math.cos((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 60 + xcenter);
        yh = (int)(Math.sin((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 60 + ycenter);
        xm = (int)(Math.cos(m * 3.14f/30 - 3.14f/2) * 90 + xcenter);
        ym = (int)(Math.sin(m * 3.14f/30 - 3.14f/2) * 90 + ycenter);
        xs = (int)(Math.cos(s * 3.14f/30 - 3.14f/2) * 90 + xcenter);
        ys = (int)(Math.sin(s * 3.14f/30 - 3.14f/2) * 90 + ycenter);
        
        g.drawOval(0, 0, 200, 200); // 원
        g.fillOval(98, 98, 4, 4); // 중심원
        g.drawString("9", xcenter - 90, ycenter + 3));
        g.drawString("3", xcenter - 80, ycenter + 3));
        g.drawString("12", xcenter - 5, ycenter + 83));
        g.drawString("6", xcenter - 3, ycenter + 93));
        
        // 과거의 선들을 지우는 방법
        g.setColor(this.getBackground());
        if( xh != xh1 || yh != yh1 ) {
            d.drawLine(xcenter, ycenter-2, xh1, yh1); 
            d.drawLine(xcenter-2, ycenter, xh1, yh1); 
        }
        if( xm != xm1 || ym != ym1 ) {
            d.drawLine(xcenter, ycenter-1, xm1, ym1); 
            d.drawLine(xcenter-1, ycenter, xm1, ym1); 
        }
        if( xs != xs1 || ys != ys1 ) {
            d.drawLine(xcenter, ycenter, xs1, ys1);
        }
        
        g.setColor(Color.black);
        g.drawLine(xcenter, ycenter-1, xs, ys);
        g.setColor(Color.red);
        g.drawLine(xcenter, ycenter-1, xm, ym);
        g.drawLine(xcenter-1, ycenter, xm, ym);
        g.setColor(Color.blue);
        g.drawLine(xcenter, ycenter-2, xh, yh);
        g.drawLine(xcenter-2, ycenter, xh, yh);
        
        xh1 = xh;
        yh1 = yh;
        xm1 = xm;
        ym1 = ym;
        xs1 = xs;
        ys1 = ys;
    }
    public void run() {
        while( timeThread != null ) {
        
            try { Thread.sleep(1000); } catch ( InterruptedException e){}
            
            repaint();
        }
    }
    public void stop() {
        timeThread = null;    
    }
}
public class Round23_Ex03 extends JApplet implements Runnable {
    private Container con;
    private BorderLayout bl = new BorderLayout();
    private JTextField jtf = new JTextField();
    private Thread timeThread;
    private Round23_Ex03_Sub es = new Round23_Ex03_Sub();
    
    public void init() {
        con = this.getContentPane();
        con.setLayout(bl);
        jtf.setEnabled(false);
        jtf.setDiabledTextColor(Color.magenta);
        jtf.setFont(new Font("TimesRoman", Font.BOLD, 15));
        jtf.setBorder(new SoftBevelBorder(SoftBevelBorder.LOWERED));
        jtf.setHorizontalAlignment(SwingConstants.CENTER);
        con.add("Center",es);
        con.add("South", jtf);
    }
    
    public void start() {
        timeThread = new Thread(this);
        timeThread.start();
    }
    
    public void stop() {
        while( timeThread != null) {
            try { Thread.sleep(1000); } catch ( InterruptedException e){}
            timeChange();
        }
    }
    
    private void timeChange() {
        Calendar ca = Calendar.getInstance();
        Date dd = new Date();
        jtf.setText(dd.toString());
    }
}

Roun23_Ex03.html

<html>
  <head>
    <!-- header - edit "Data/yourHtmlHeader" to customize -->
    <!-- contents - edit "EventHandlers/Html file/onCreate" to customize -->
    <meta name="generator" content="ModelWorks IDE" />
    <title></title>
  </head>
  <body>
    <center>
      <h2>시간을 표시합니다.</h2>
      <applet code="Round23_Ex03.class" width=300 height=350 ></applet>
      <hr>
      <a href="Round23_Ex03.java">소스보기</a>
    </center>
  </body>
</html>

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