Java 进制转换

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package com.test;     public class A {       /**      * @param args      */     public static void main(String[] args) {         //其他进制转10进制         System.out.println("2转10 :"+ Integer.valueOf("1010",2).toString());         System.out.println("8转10 :"+ Integer.valueOf("125",8).toString() );         System.out.println("16转10:"+ Integer.valueOf("ABCDEF",16).toString());         //10进制转其他进制         int a = 11;         System.out.println("10转2 :"+ Integer.toBinaryString(a));         System.out.println("10转8 :"+ Integer.toOctalString(a));         System.out.println("10转16:"+ Integer.toHexString(a));                   //16进制字符串         String hex = "5a5a";         System.out.println("16进制字符串转字节数组:");         int len = hex.length();         byte[] hexbytes = new byte[len / 2];         for (int i = 0; i < len; i += 2) {             //16进制  16位, 字节8位, 所以16进制1位 占  字节的4位, 两位组成8位字节             hexbytes[i / 2] = (byte) ((Character.digit(hex.charAt(i), 16) << 4) + Character.digit(hex.charAt(i + 1), 16));         }                   //字节数组转16进制         System.out.println("字节数组转16进制:");         hex = null;         for (int i = 0; i < hexbytes.length; i++) {             hex = Integer.toString(hexbytes[i] & 0xff, 16);             if(hex.length() == 1)                 hex = "0" + hex;             System.out.print(hex+",");         }                   //字节         byte b = hexbytes[0];         char c = (char) (((hexbytes[0] & 0xFF) << 8) | (hexbytes[1] & 0xFF));         System.out.println(c);                   byte[] intbytes = {0x00,0x00,0x00,0x31};         //高位在前,低位在后  字节8位,int32位,所以4个字节为1个int         int chunktype = (int)(intbytes[0] & 0xff)<<24 | (intbytes[1] & 0xff)<<16 | (intbytes[2] & 0xff)<<8 | (intbytes[3] & 0xff);         System.out.println("字节数组转int:"+chunktype);               }           /**      * 自动补零      * @param code      * @param num      * @return      */     private static String autoGenericCode(String code, int num) {         // 保留num的位数         // 0 代表前面补充0         // d 代表参数为正数型         code = String.format("%0" + num + "d", Integer.parseInt(code));         return code;     }         }