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);

//当然还有可以设定编码方式
的
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();
    }