Base64 { public static String decode2UTFString(String in) { return new String(DECODER.decode(in), StandardCharsets.UTF_8); } private  Base64(); static String decode2UTFString(String in); static String encode(String text);  }
@Test public void testDecode2UTFString() { assertEquals(Base64.decode2UTFString("U2t5V2Fsa2luZw=="), "SkyWalking"); }