Java encode and decode a String in Base64

The sample code here demonstrates how to encode and decode a string object in the Base64 format.

If you get a compile-time warning such as "warning: com.sun.org.apache.xerces.internal.impl.dv.util. Base64 is internal proprietary API and may be removed in a future release", you may consider to use the java.util.Base64 (java 8) or javax.sml.bind.DatatypeConverter (java 7) to avoid the warning.

1. java 8 or a later version of java

import java.util.Base64;
public class Base64Test {
    public static void main(String [] args){
        String secret = "This message is top secret";
        byte[] encoded = Base64.getEncoder().encode(secret.getBytes());
        System.out.println("encoded value is "+ new String(encoded));
     
        byte[] decoded = Base64.getDecoder().decode(encoded);
        System.out.println("Decoded value is "+new String(decoded));
   }
} 

2. java 7 or an earlier version of java

import javax.xml.bind.DatatypeConverter;
public class Base64Test {
    public static void main(String [] args){
       String secret = "This message is top secret";
        String encoded = DatatypeConverter.printBase64Binary(secret.getBytes());
        System.out.println("encoded value is "+ encoded);
     
        byte[] decoded = DatatypeConverter.parseBase64Binary(encoded);
        System.out.println("Decoded value is "+new String(decoded));
    }
}

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References:

1. Base64 Java encode and decode a string