java convert double to bytes[]

/**
 * @author lautturi.com
 * Java example: double to bytes[] convertion in java
 */

import java.util.*;
import java.time.*;

public class Lautturi {	  

	public static void main(String[] args) {
		double num = 3.15;
		byte[] bytes = String.valueOf(num).getBytes();
		System.out.println(Arrays.toString(bytes));
	}
}

output:

[51, 46, 49, 53]

Note:

Ascii code :51->3
Ascii code :46->.
Ascii code :49->1
Ascii code :53->5