content: import java.util.Base64;
  
  class MyApp {
      public static String KEY = "VGVzdFBhc3N3b3Jk";
      public static byte[] KEY2 = new byte[] { 'V', 'G', 'V', 'z', 'd', 'F', 'B', 'h', 'c', '3', 'N', '3', 'b', '3', 'J',
              'k' };
  
      public String getDecoderString() {
          byte[] decodedBytes = Base64.getDecoder().decode(MyApp.KEY);
  
          String decodedString = new String(decodedBytes);
          return decodedString;
      }
  
      public String getDecoderBytes() {
          byte[] decodedBytes = Base64.getDecoder().decode(MyApp.KEY2);
  
          String decodedString = new String(decodedBytes);
          return decodedString;
      }
  
      public String getDecoderConvertString() {
          String key = new String(MyApp.KEY2);
          byte[] decodedBytes = Base64.getDecoder().decode(key);
  
          String decodedString = new String(decodedBytes);
          return decodedString;
      }
  
      public String getDecoderConvertBytes() {
          byte[] key = MyApp.KEY.getBytes();
          byte[] decodedBytes = Base64.getDecoder().decode(key);
  
          String decodedString = new String(decodedBytes);
          return decodedString;
      }
  
      public String simpleDecoderString() {
          byte[] decodedBytes = Base64.getDecoder().decode("U2VjcmV0S2V5");
  
          String decodedString = new String(decodedBytes);
          return decodedString;
      }
  
  }