JAVa中进制之间的转化方法

 public class Code {

     public static void main(String[] args)  throws Exception{
         // TODO Auto-generated method stub
         String s="自己练习";
         byte[] byte1=s.getBytes();//将字符串转化为字符数组,用项目默认的编码
         for (byte b : byte1) {
             //把字节以十六进制的方式显示
             System.out.print(Integer.toHexString(b&0xff)+" ");
         }
     System.out.println( );
     //jbk中文占用两个字节，英文占用一个字节
     byte[] byte2=s.getBytes("gbk");
     for (byte b : byte2) {
         System.out.print(Integer.toHexString(b&0xff)+" ");
     }
 //其中个utf-8中文占用三个字节，英文占用一个字节
     System.out.println();
     byte[] byte3=s.getBytes("utf-8");
     for (byte b : byte3) {
         System.out.print(Integer.toHexString(b&0xff)+" ");
     }
     //java是双字节编码，utf-16be编码
     //其中中文占用两个字节，英文占用两个字节
     System.out.println();
     byte[] byte4=s.getBytes("utf-16be");
     for (byte b : byte4) {
         System.out.print(Integer.toHexString(b&0xff)+" ");
     }
     System.out.println();
     String st1=new String(byte4,"utf-16be");
     System.out.print(st1);

     System.out.println();
     byte[] byte5=s.getBytes("US-ASCII");
     for (byte b : byte5) {
         System.out.print(Integer.toHexString(b&0xff)+" ");
     }
     }

 }