kfmes's blog

ArrayList라는걸 한번 써봤다
eclipse 3.2 , jdk 5.0 이어서 그런지
자동완성으로 class<Element>가 자동으로 붙었다!!

[CODE type="java"]
import java.util.ArrayList;
import java.util.ListIterator;

class Buddy{
[tab]protected String loginName = null;
[tab]protected String nickName = null;
[tab]public Buddy() {
[tab][tab]
[tab]}
[tab]public Buddy(String loginName, String nickName) {
[tab][tab]this.loginName = loginName;
[tab][tab]this.nickName = nickName;
[tab]}
[tab]public String toString(){
[tab][tab]return "LName:" + loginName + "/NName:" + nickName;
[tab]}
}

public class DStest {
[tab]
[tab]private ArrayList<Buddy> list = null;
[tab]
[tab]public DStest() {
[tab][tab]list = new ArrayList<Buddy>();
[tab][tab]
[tab]}
[tab]public void add(Buddy e)
[tab]{
[tab][tab]list.add(e);
[tab]}
[tab]public Buddy getBuddy(int idx){
[tab][tab]return list.get(idx);[tab][tab]
[tab]}
[tab]
[tab]
[tab]
[tab]public void sortList(){
[tab][tab]Buddy tmp;
[tab][tab]for(int i=0;i<list.size();i++){
[tab][tab][tab]for(int j=i;j<list.size();j++)
[tab][tab][tab][tab]if(list.get(i).nickName.compareTo(list.get(j).nickName)>0){
[tab][tab][tab][tab][tab]tmp = list.get(i);
[tab][tab][tab][tab][tab]list.set(i, list.get(j));
[tab][tab][tab][tab][tab]list.set(j, tmp);
[tab][tab][tab][tab]}
[tab][tab]}
[tab]}
[tab]
[tab]public void printList(){
[tab][tab]ListIterator<Buddy> li = list.listIterator();
[tab][tab]Buddy cur;
[tab][tab]while(li.hasNext()){
[tab][tab][tab]cur = li.next();
[tab][tab][tab]System.out.println(cur);[tab][tab][tab]
[tab][tab]}
[tab][tab]
[tab]}
[tab]
[tab]public static void main(String args[]){
[tab][tab]DStest test = new DStest();
[tab][tab]test.add(new Buddy("foobar","asdfefef"));
[tab][tab]test.add(new Buddy("thisff","dsfasdfasdf"));
[tab][tab]test.add(new Buddy("asdfaf","asdfae54ewf"));
[tab][tab]test.add(new Buddy("vzxvsd","zxvcxcerqer"));
[tab][tab]test.add(new Buddy("zxcvwe","asdfer2wera"));
[tab][tab]test.add(new Buddy("saerer","zvczxcadfwe"));
[tab][tab]test.add(new Buddy("xvas43","zxvcvawer3r"));
[tab][tab]test.add(new Buddy("cxvaer","cxvaerqwer2"));
[tab][tab]
[tab][tab]test.printList();
[tab][tab]System.out.println("========SORT=============");
[tab][tab]test.sortList();
[tab][tab]
[tab][tab]test.printList();
[tab][tab][tab]
[tab]}

}

[/HTML][/CODE]

실행결과

LName:foobar/NName:asdfefef
LName:thisff/NName:dsfasdfasdf
LName:asdfaf/NName:asdfae54ewf
LName:vzxvsd/NName:zxvcxcerqer
LName:zxcvwe/NName:asdfer2wera
LName:saerer/NName:zvczxcadfwe
LName:xvas43/NName:zxvcvawer3r
LName:cxvaer/NName:cxvaerqwer2
========SORT=============
LName:asdfaf/NName:asdfae54ewf
LName:foobar/NName:asdfefef
LName:zxcvwe/NName:asdfer2wera
LName:cxvaer/NName:cxvaerqwer2
LName:thisff/NName:dsfasdfasdf
LName:saerer/NName:zvczxcadfwe
LName:xvas43/NName:zxvcvawer3r
LName:vzxvsd/NName:zxvcxcerqer

덜덜덜
if문 뒤에 세미콜론(;)붙이는 실수를 해버렸다니..

이런 초보적인 실수를-┎

수퍼클래스, 상속클래스 동시에 사용해보기

일종의 꼼수인건가 -ㅁ-

[CODE type="java"]

class superfoo{
[tab]protected String bar() {
[tab][tab]return "덜덜덜";
[tab]}
}

public class foo extends superfoo{
[tab]public String superbar(){
[tab][tab]return super.bar();[tab][tab]
[tab]}
[tab]public String bar(){
[tab][tab]return "후덜덜";
[tab]}
[tab]
[tab]public static void  print(String msg){
[tab][tab]System.out.println(msg);
[tab]}
[tab]
[tab]public static void main(String[] args){
[tab][tab]foo ppp = new foo();

[tab][tab]print(ppp.superbar());
[tab][tab]print(ppp.bar());
[tab]}
}

[/HTML][/CODE]

사이월드 채팅프로그램 분석
스샷입니당.

import javax.swing.*;
import java.util.*;

public class CyChat extends JFrame implements ActionListener{
[tab]
[tab]JTextArea txt_input;
[tab]
[tab]JPanel jp = new JPanel();
[tab]
[tab]
[tab]
[tab]public void init(){

  [tab]
  [tab]txt_input = new JTextArea(30,50);
  [tab]jp.add(new JScrollPane(txt_input), BorderLayout.CENTER);
  [tab]setSize(800,600);
  [tab]
[tab]
  [tab]    [tab]
  [tab]//jp.add(txt_input);
  [tab]
  [tab]
  [tab]JButton cmd_ok = new JButton("실행");
  [tab]jp.add(cmd_ok,BorderLayout.EAST);
  [tab]
  [tab]cmd_ok.addActionListener(this);
  [tab]add(jp);
  [tab]
 
  [tab]
  [tab]
[tab]}
[tab]public void paint(Graphics g){
[tab][tab]super.paint(g);
[tab][tab]
[tab]}
[tab]

[tab]public void actionPerformed(ActionEvent e) {

[tab][tab]String res;
[tab][tab]res = txt_input.getText();
[tab][tab]
[tab][tab]txt_input.setText( parse(res));
[tab][tab]repaint();
[tab][tab]
[tab][tab]
[tab]}

[tab]public CyChat(){

[tab][tab]super("hi");
[tab][tab]init();
[tab][tab]setSize(640,640);
[tab][tab]setVisible(true);
[tab][tab]
[tab]}
[tab]

[tab]public String parse(String text){
[tab][tab]StringBuffer buf = new StringBuffer();

[tab][tab]//text = text.replaceAll("%u","0x%");
[tab][tab]text = text.replaceAll("%20"," ");
[tab][tab]String arText[] = text.split("\n");
[tab][tab]String tmp;
[tab][tab]
[tab][tab]
[tab]
[tab][tab]StringTokenizer token = new StringTokenizer(text,"%");
[tab][tab]tmp ="";
[tab][tab]while(token.hasMoreTokens()){
[tab][tab][tab]try{
[tab][tab][tab][tab]tmp = token.nextToken();
[tab][tab][tab][tab]
[tab][tab][tab][tab][tab]
[tab][tab][tab][tab][tab]int intval = 0;
[tab][tab][tab][tab][tab]char charval;
[tab][tab][tab][tab][tab]
[tab][tab][tab][tab][tab]intval = Integer.parseInt(tmp.substring(1).trim(),16);
[tab][tab][tab][tab][tab]charval = (char)intval;
[tab][tab][tab][tab][tab]buf.append(charval );

[tab][tab][tab]}
[tab][tab][tab]catch (NumberFormatException e) {
[tab][tab][tab][tab]buf.append(tmp);

[tab][tab][tab]}
[tab][tab]}
[tab][tab]buf.append("\n");
[tab][tab]
[tab]
[tab][tab]
[tab][tab]return buf.toString();
[tab]}
[tab]
  public static void main(String args[]){
[tab][tab]CyChat  cy = new CyChat();
  [tab]
[tab]
[tab][tab]
[tab][tab]cy.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE);
[tab][tab]
[tab]}

}
[/HTML][/CODE]
밑에 포스트에서 삽질한 결과물입니다-_-a
악용하지마세요
이 프로그램을 사용해서 일어나는 일에 대해서는 책임지지 않습니다.

NICK 'm011가현
USER 15000981176 15000981176 15000981176 15000981176
:?? Y   Y    ?? ?? E  Ki? t?? )?芷X?a ??튡?  :cychat 800 * 0 0 NTLM,ANON 512 *
:?0? 6   6    ?? ??? E  (t? €??芷? )?X뱫@튏a ?鼈]  :?#2
?  ?   ?? ?? E 홬? t珥? )?芷X?a ??튡쬸   :cychat 800 * 1 0 NTLM,ANON 512 *
:cychat 001 'm011가현 :Welcome to the Microsoft Exchange Chat Service server 'm011가현
:cychat 002 'm011가현 :Your host is cychat, running version 5.5.2650
:cychat 003 'm011가현 :This server was created Jul 20 1999 at 07:26:59 PDT
:cychat 004 'm011가현 cychat 5.5.2650 aioxz abcdefhiklmnoprstuvxyz
:cychat 251 'm011가현 :There are 33 users and 0 invisible on 1 servers
:cychat 254 'm011가현 6 :channels formed
:cychat 255 'm011가현 :I have 33 clients and 0 servers
:cychat 265 'm011가현 :Current local users: 33 Max: 103
:cychat 266 'm011가현 :Current global users: 33 Max: 103
:cychat 422 'm011가현 :MOTD File is missing

[CODE type="java"]

public static void main(String args[]){

[tab]for(int i='ㄱ';i<='ㅎ';i++)
[tab]{
[tab][tab]System.out.print( (char)i);
[tab]}
}

[/HTML][/CODE]
위 코드의 실행 결과는?

무척이나 황당스러운 코드이겠지만
실행이 되는걸 목격했다-_-;

ㄱㄲㄳㄴㄵㄶㄷㄸㄹㄺㄻㄼㄽㄾㄿㅀㅁㅂㅃㅄㅅㅆㅇㅈㅉㅊㅋㅌㅍㅎ

어쩌면 이와 비슷한 코드를 이따금씩 사용했을런지도 모른다
[CODE type="c"]
int i;
for(i='A';i<='Z';i++)
[tab]printf("%c",i);
}
[/HTML][/CODE]

자바에서 저렇게 한글로 써도 에러없이 실행이 되다니 ····
아마도 내부적으로 유니코드를 사용하기 때문이 아닐까 생각해본다.