TanSanC

JavaChattingClient.zip

JavaChattingServer.zip

JScrollPane , ScrollPane

JScrollPane sp = new JScrollPane(스크롤을 붙일 컴포넌트);

add(sp);

ScrollPane sp = new ScrollPane();

sp.add(스크롤을 붙일 컴포넌트);

add(sp);

Java TextArea 에 ScrollPane 장착하기.

  JScrollPane sp = new JScrollPane();
  ta = new JTextArea();
  sp.add(ta);

JScrollPane 에

Scroll 을 달고 싶은 컴포넌트를

add

한 후

Scroll 을 panel 이나 frame 에 add 하면 됩니다.

import java.awt.BorderLayout;

import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JTextField;

public class MyFrame extends JFrame {
 public static JTextArea ta;
 public static JTextField tf;
 public MyFrame() {
  ta = new JTextArea();
  tf = new JTextField();
  add(ta,BorderLayout.CENTER);
  add(tf,BorderLayout.SOUTH);
  setSize(300,200);
  setDefaultCloseOperation(EXIT_ON_CLOSE);
  setVisible(true);
 }
}

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.Socket;

import java.net.UnknownHostException;

import java.util.Scanner;

class RecvThread extends Thread {

     Socket s;

     public RecvThread(Socket s) {

          this.s = s;

     }

     @Override

     public void run() {

          // 받는 부분

          BufferedReader is;

          try {

              is = new BufferedReader(new InputStreamReader(s.getInputStream()));

              String recvMsg;

              while ((recvMsg = is.readLine()) != null) {

                   System.out.println(recvMsg);

              }

          } catch (IOException e) {

              // TODO Auto-generated catch block

              e.printStackTrace();

          }

     }

}

class SendThread extends Thread {

     Socket s;

     public SendThread(Socket s) {

          this.s = s;

     }

     @Override

     public void run() {

          PrintWriter os;

          try {

              os = new PrintWriter(s.getOutputStream(), true);

              // 보내는 부분

              Scanner sc = new Scanner(System.in);

              while (true) {

                   String msg = sc.next();

                   os.println(msg);

              }

          } catch (IOException e) {

              // TODO Auto-generated catch block

              e.printStackTrace();

          }

     }

}

public class ClientTest {

     public static void main(String[] args) {

          try {

              Socket s = new Socket("115.20.247.142", 4000);

              SendThread st = new SendThread(s);

              RecvThread rt = new RecvThread(s);

          } catch (UnknownHostException e) {

              // TODO Auto-generated catch block

              e.printStackTrace();

          } catch (IOException e) {

              // TODO Auto-generated catch block

              e.printStackTrace();

          }

     }

}

import java.util.Scanner;

public class Exercise {

     public static void main(String[] arg) {

          int[] arr = new int[10];

          Scanner sc = new Scanner(System.in);

          for (int i = 0; i < 10; i++) {

              arr[i] = sc.nextInt();

          }

          // 입력

          Sort(arr);

          // 출력

          for (int i = 0; i < 10; i++) {

              System.out.println(arr[i]);

          }

     }

     public static void Sort(int[] a) {

          int n = 10;

          int temp;

          int j;

          boolean move;

          for( int i = 1; i < n ; i = i + 1)

          {

              temp = a[i];

              j = i;

              if( a[j-1] > temp )

              {

                   move = true;                

              }

              else

              {

                   move = false;

              }

              while(move)

              {

                   a[j] = a[j-1];

                   j = j - 1 ;

                   if( j > 0 && a[j-1] > temp)

                   {

                        move = true;

                   }

                   else

                   {

                        move = false;

                   }

              }

              a[j] = temp;

          }

     }

}

        // String To int

        int numInt = Integer.parseInt(numStr);

        System.out.println(numInt);

        // int To String

        String numStr2 = String.valueOf(numInt);

        System.out.println(numStr2);

#include <stdio.h>

int main(void)

{

        int a;

        printf("%d", a);

        return 0;

}

Run-Time Check Failure #3 - The variable 'a' is being used without being initialized.

이 에러는 a 라는 변수가 초기화 없이 사용되었다고 나는 에러로

a 라는 변수에는 아무 값도 저장 되지 않은 상태이므로

a 라는 변수를 연산에 사용하거나 출력하면 a 라는 값이 무슨 값일지 모르니까 문제가 된다.

( 출력 내용을 예상 할 수 있겠는가? )

a 에 어떤 값은 저장시킨 다음 사용하면 문제가 없다.

#include <stdio.h>

#include <conio.h>

#include <windows.h>

#include <stdlib.h>

#include <time.h>

void gotoxy(int x, int y){

    COORD Pos = {x-1, y-1};

SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE),Pos);

}

void main(){

    int x=1;

    int y=1;

    int chr;

    while(1){

        chr = getch();

        if(chr == 0 || chr == 0xe0){

            chr = getch();

            if(chr == 72){ //상

                y--;

                if(y<1)y =1;

            }else if(chr == 80){ //하

                y++;

            }else if(chr == 75){ //좌

                x--;

                if(x<1)x=1;

            }else if(chr == 77){ //우

                x++;

            }

            system("cls");

            gotoxy(x,y);

            printf("*");

        }

    }

}

출처 : http://peulblog.tistory.com/5

#include <iostream>

#include <string>

using namespace std;

class 에어컨

{

public:

    virtual void powerOn()  {

        cout << "에어컨이켜집니다." << endl;

    }

};

class 냉난방기: public 에어컨

{

public:

    void powerOn()  {

        cout << "냉난방기가켜집니다." << endl;

    }

};

void TestFunc(에어컨* tf)

{

    (*tf).powerOn();

}

int main()

{

    에어컨a;

    TestFunc(&a);

    냉난방기b;

    TestFunc(&b);

    return 0;

}