Java/Data Type/Octal

Convert Decimal to Octal

   <source lang="java">
 
public class Main {
 public static void main(String[] args) {
   int integer = 1024;
   String octal = Integer.toOctalString(integer);
   System.out.printf("Octal value of %d is "%s".\n", integer, octal);
   System.out.printf("Octal value of %1$d is "%1$o".\n", integer);
   int original = Integer.parseInt(octal, 8);
   System.out.printf("Integer value of octal "%s" is %d.", octal, original);
 }

}

 </source>
   
  
 
  

Decodes Hex data into octects

   <source lang="java">
  

/* Copyright 2004 The Apache Software Foundation

*
*   Licensed under the Apache License, Version 2.0 (the "License");
*   you may not use this file except in compliance with the License.
*   You may obtain a copy of the License at
*
*       http://www.apache.org/licenses/LICENSE-2.0
*
*   Unless required by applicable law or agreed to in writing, software
*   distributed under the License is distributed on an "AS IS" BASIS,
*   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*   See the License for the specific language governing permissions and
*  limitations under the License.
*/

//xmlbeans import java.io.UnsupportedEncodingException; /**

* format validation
*
* This class encodes/decodes hexadecimal data
* @author Jeffrey Rodriguez
* @version $Id: HexBin.java 125124 2005-01-14 00:23:54Z kkrouse $
*/

public class Main {

 static private final int  BASELENGTH   = 255;
 static private final int  LOOKUPLENGTH = 16;
 static private byte [] hexNumberTable    = new byte[BASELENGTH];
 static private byte [] lookUpHexAlphabet = new byte[LOOKUPLENGTH];

 static {
     for (int i = 0; i<BASELENGTH; i++ ) {
         hexNumberTable[i] = -1;
     }
     for ( int i = "9"; i >= "0"; i--) {
         hexNumberTable[i] = (byte) (i-"0");
     }
     for ( int i = "F"; i>= "A"; i--) {
         hexNumberTable[i] = (byte) ( i-"A" + 10 );
     }
     for ( int i = "f"; i>= "a"; i--) {
        hexNumberTable[i] = (byte) ( i-"a" + 10 );
     }
     for(int i = 0; i<10; i++ )
         lookUpHexAlphabet[i] = (byte) ("0"+i );
     for(int i = 10; i<=15; i++ )
         lookUpHexAlphabet[i] = (byte) ("A"+i -10);
 }

 /**
  * Decodes Hex data into octects
  *
  * @param binaryData String containing Hex data
  * @return string containing decoded data.
  */
 public static String decode(String binaryData) {
     if (binaryData == null)
         return null;
     byte[] decoded = null;
     try {
       decoded = decode(binaryData.getBytes("utf-8"));
     }
     catch(UnsupportedEncodingException e) {
     }
     return decoded == null ? null : new String(decoded);
 }
 static public byte[] decode(byte[] binaryData) {
     if (binaryData == null)
         return null;
     int lengthData   = binaryData.length;
     if (lengthData % 2 != 0)
         return null;
     int lengthDecode = lengthData / 2;
     byte[] decodedData = new byte[lengthDecode];
     for( int i = 0; i<lengthDecode; i++ ){
         if (!isHex(binaryData[i*2]) || !isHex(binaryData[i*2+1])) {
             return null;
         }
         decodedData[i] = (byte)((hexNumberTable[binaryData[i*2]] << 4) | hexNumberTable[binaryData[i*2+1]]);
     }
     return decodedData;
 }
 /**
  * byte to be tested if it is Base64 alphabet
  *
  * @param octect
  * @return
  */
 static boolean isHex(byte octect) {
     return (hexNumberTable[octect] != -1);
 }

}

 </source>