String类型getBytes方法

package wordcount1;


import java.io.UnsupportedEncodingException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class demo 
{
public static void main(String[] args)
{
String a="哈哈";
 try {
  byte[] aa = a.getBytes("GB2312");//a的内容用 GB2312进行编码存于aa数组中
  byte[] ab = a.getBytes("UTF-8");//a的内容用 UTF-8进行编码存于aa数组中
  for (int i = 0; i < aa.length; i++) {
   System.out.print(aa[i]);
  }
  System.out.println();
  for (int i = 0; i < ab.length; i++) {
   System.out.print(ab[i]);
  }
  System.out.println();
  System.out.println(new String(aa));
  System.out.println(new String(ab, "UTF-8"));
  System.out.println(new String(aa, "UTF-8"));
 } catch (UnsupportedEncodingException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }

    }

输出：

-71-2-71-2
-27-109-120-27-109-120
哈哈
哈哈
????

}