Java 二进制和十进制互转，二进制和BitSet互转

    /**
     * 二进制转十进制
     * 
     * @param binaryNumber
     * @return
     */
    public static int binaryToDecimal(int binaryNumber) {

        int decimal = 0;
        int p = 0;
        while (true) {
            if (binaryNumber == 0) {
                break;
            } else {
                int temp = binaryNumber % 10;
                decimal += temp * Math.pow(2, p);
                binaryNumber = binaryNumber / 10;
                p++;
            }
        }
        return decimal;
    }

    /**
     * 十进制转二进制
     * 
     * @param n
     * @return
     */
    public static String decimalToBinary(int n) {
        String str = "";
        while (n != 0) {
            str = n % 2 + str;
            n = n / 2;
        }
        return str;
    }
    
    /** 
     * @Description: 十进制转换成二进制 () 
     * @param decimalSource 
     * @return String 
      */  
     public static String decimalToBinary(BigInteger decimalSource) {  
//         BigInteger bi = new BigInteger(String.valueOf(decimalSource));  //转换成BigInteger类型  
         return decimalSource.toString(2);  //参数2指定的是转化成X进制，默认10进制  
     }  
       
     /** 
     * @Description: 二进制转换成十进制  
     * @param binarySource 
     * @return int 
      */  
     public static BigInteger binaryToDecimal(String binarySource) {  
         BigInteger bi = new BigInteger(binarySource, 2);    //转换为BigInteger类型  
//         return Integer.parseInt(bi.toString());     //转换成十进制  
         return bi;     //转换成十进制  
     }  

        /**
         * BitSet转二进制
         * 
         * @param bitSet
         * @return
         */
        public static String bitSetToBinary(BitSet bitSet) {
            StringBuilder stringBuilder = new StringBuilder();
            for (int i = 0; i < bitSet.length(); i++) {
                if (bitSet.get(i)) {
                    stringBuilder.append("1");
                } else {
                    stringBuilder.append("0");
                }
            }
            return stringBuilder.toString();
        }

        /**
         * 二进制转BitSet
         * 
         * @param binary
         * @return
         */
        public static BitSet binaryToBitSet(String binary) {
            BitSet bitSet = new BitSet();
            for (int i = 0; i < binary.length(); i++) {
                String c = String.valueOf(binary.charAt(i));
                if ("1".equals(c)) {
                    bitSet.set(i, true);
                }
            }
            return bitSet;
        }