Java Base64 getDecoder()

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In this guide, you will learn about the Base64 getDecoder() method in Java programming and how to use it with an example.

1. Base64 getDecoder() Method Overview

Definition:

The getDecoder() method of the Base64 class in Java is a static method that returns a Base64.Decoder. This decoder is used to decode data encoded with the Basic type base64 encoding scheme. The method belongs to the java.util package, providing a mechanism to decode base64 encoded strings as per RFC 4648.

Syntax:

public static Base64.Decoder getDecoder()

Parameters:

- The method does not take any parameters.

Key Points:

- The getDecoder() method does not throw any exceptions.

- It returns a Base64.Decoder for decoding base64 encoded data using the Basic type base64 encoding scheme.

- The decoder discards whitespace from the input as per the specifications of RFC 2045.

2. Base64 getDecoder() Method Example

import java.util.Base64;

public class Base64DecoderExample {

    public static void main(String[] args) {
        // Get a Base64.Decoder
        Base64.Decoder decoder = Base64.getDecoder();

        // Input base64 encoded data
        String encodedData = "SmF2YSBCYXNlNjQgRGVjb2RpbmcgRXhhbXBsZQ==";

        // Decode the input data
        byte[] decodedData = decoder.decode(encodedData);

        // Convert the decoded byte array to a string
        String originalData = new String(decodedData);

        // Print the original data
        System.out.println("Original Data: " + originalData);
    }
}

Output:

Original Data: Java Base64 Decoding Example

Explanation:

In this example, a Base64.Decoder object is obtained using the getDecoder() method. We then provided a base64 encoded string, decoded it using the decode() method of the Base64.Decoder object, and converted the resulting byte array back to a string. Finally, the original data is printed to the console, showcasing the decoding process.

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