Convert byte to string in Java

The string ctor is suitable for this conversion:

System.out.println("string " + new String(new byte[] {0x63}));

System.out.println(new String(new byte[]{ (byte)0x63 }, "US-ASCII"));

Note especially that converting bytes to Strings always involves an encoding. If you do not specify it, you'll be using the platform default encoding, which means the code can break when running in different environments.