java里面byte数组和String字符串怎么转换

//string 转 byte[]

String str = "Hello";

byte[] srtbyte = str.getBytes();

// byte[] 转 string

String res = new String(srtbyte);

System.out.println(res);

String str = "hello";

byte[] srtbyte = null;

try {

    srtbyte = str.getBytes("UTF-8");

    String res = new String(srtbyte,"UTF-8");

    System.out.println(res);

    } catch (UnsupportedEncodingException e) {

    // TODO Auto-generated catch block

    e.printStackTrace();

    }