아래 예제 코드를 SystemDateTimeSyncTest.java 파일로 작성한다.

실행시 반드시 루트 권한으로 실행하여야 

public class SystemDateTimeSyncTest {
  public static void main(String[] args) {
    this.updateSystemDateTime("20100217161550"); // 2010-02-17 16:15:50
  }

  private boolean updateSystemDateTime(String recvMsg)
  {
    String strDate = null;
    String[] cmds = null;
    BufferedReader br = null;
    Process proc = null;
    boolean result = false;
    try {
      strDate = recvMsg.substring(0, 4) + "-" + recvMsg.substring(4, 6) + "-" + recvMsg.substring(6, 8) + " "
        + recvMsg.substring(8, 10) + ":" + recvMsg.substring(10, 12) + ":" + recvMsg.substring(12, 14);
      cmds = new String[] { "/bin/date", "-s", strDate };

      System.out.println("user.name: " + System.getProperty("user.name"));
      Runtime runtime = Runtime.getRuntime();
      runtime.traceInstructions(true);
      runtime.traceMethodCalls(true);
      proc = runtime.exec(cmds);
      br = new BufferedReader(new InputStreamReader(proc.getInputStream()));

      String execLine = null;
      while( (execLine = br.readLine()) != null) {
        System.out.println("----------> " + execLine);
      }

      br.close();
      br = null;

      br = new BufferedReader(new InputStreamReader(proc.getErrorStream()));

      while( (execLine = br.readLine()) != null) {
        System.out.println("----------> " + execLine);
      }
      proc.waitFor();
      System.out.println("Exit value: " + proc.exitValue());
      result = true;
    } catch(Exception e) {
      e.printStackTrace();
      result = false;
    }
    finally {
      try { br.close(); } catch(Exception e2) {}
      br = null;
      cmds = null;
      strDate = null;
      proc = null;
    }
    return result;
  }
}

byte[] baTemp = new byte[4];
// 아래 4 바이트는 float 형 5.05 임.
baTemp[3] = (byte)0x9a;
baTemp[2] = (byte)0x99;
baTemp[1] = (byte)0xa1;
baTemp[0] = (byte)0x40;

try {
    DataInputStream dis = new DataInputStream(new ByteArrayInputStream(baTemp));
    System.out.println(dis.readFloat()); // 5.05가 출력됨.
    dis.close();
}
catch (Exception e) {
    e.printStackTrace();
}

byte[] baTemp = new byte[4];
// 아래 4 바이트는 float 형 5.05 임.
baTemp[3] = (byte)0x9a;
baTemp[2] = (byte)0x99;
baTemp[1] = (byte)0xa1;
baTemp[0] = (byte)0x40;

// 정수형(int)으로 변환
int iTemp = (baTemp[0] << 24) & 0xff000000;
iTemp |= (baTemp[1] << 16) & 0x00ff0000;
iTemp |= (baTemp[2] << 8) & 0x0000ff00;
iTemp |= (baTemp[3]) & 0x000000ff;

System.out.println(Float.intBitsToFloat(iTemp); // 5.05 출력됨.

import org.quartz.Scheduler;
import org.quartz.SchedulerException;
import org.quartz.impl.StdSchedulerFactory;

public class QuartzTest {

    public static void main(String[] args) {

        try {
            // Grab the Scheduler instance from the Factory 
            Scheduler scheduler = StdSchedulerFactory.getDefaultScheduler();

            // and start it off
            scheduler.start();

            scheduler.shutdown();

        } catch (SchedulerException se) {
            se.printStackTrace();
        }
    }
}

...
     try {
      File file = new File(strFilename);

      FileInputStream fis = new FileInputStream(file);

      BufferedReader br = new BufferedReader(new InputStreamReader(fis, "EUC_KR"));

      while((line = br.readLine()) != null) {
        total_line += (line + "\n");
        System.out.println(line);
      }
    } catch (Exception ex) {
      ex.printStackTrace();
    }
...

...
String
strConn = "jdbc:mysql://" + hostname + "/" + dbname + "?user=" + user +
"&password=" + passwd +
"&useUnicode=true&characterEncoding=latin1&relaxAutoCommit=true";

Connection conn = DriverManager.getConnection(strConn);
...