public char getRandomChar(){

String str ="";

int hightpos; 

int lowpos;

Random random = new Random();

hightpos = (176+Math.abs((random.nextInt(39))));

lowpos =(161+ Math.abs((random.nextInt(93))));

byte b[] =new byte[2];

b[0] = (Integer.valueOf(hightpos)).byteValue();

b[1] = (Integer.valueOf(lowpos)).byteValue();

try {

str =new String(b,"GBK");

} catch (UnsupportedEncodingException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return str.charAt(0);

}