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Understanding byte in Java

Posted on 2016-08-06
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Hello there,

I am trying to understand what it means when the return type in byte. is it number format or ascii??confused. ALso I have this code below when retunrs the buffer length. first it prints 0 and then in the second print it outputs 28. I want to know where it gets this 28 from. I will appreciate your help to understand this concept.

cheers
Zolf

public class App
{
	public static void main(String[] args)
	{
		System.out.println("Hello Vert.x!");

		Buffer buffer = Buffer.buffer();

		System.out.println("buffer.length() = " + buffer.length());

		buffer.setByte  ( 0, (byte)  127);
		buffer.setShort ( 2, (short) 127);
		buffer.setInt   ( 4,         127);
		buffer.setLong  ( 8,         127);
		buffer.setFloat (16,      127.0F);
		buffer.setDouble(20,      127.0D);

		System.out.println("buffer.length() = " + buffer.length());

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Question by:zolf
2 Comments
 
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by:
Dave Baldwin earned 2000 total points
ID: 41745377
Here is the 'doc' page for JAVA data types:  http://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html   It defines all of them.  

As for your code above, declaring the buffer does not assign anything to it but the 'buffer.set...' statements do.  If you run the code below, you will see that the buffer.length increases with each assignment.

public class App
{
	public static void main(String[] args)
	{
		System.out.println("Hello Vert.x!");

		Buffer buffer = Buffer.buffer();

		System.out.println("buffer.length() = " + buffer.length());

		buffer.setByte  ( 0, (byte)  127);
		System.out.println("buffer.length() = " + buffer.length());
		buffer.setShort ( 2, (short) 127);
		System.out.println("buffer.length() = " + buffer.length());
		buffer.setInt   ( 4,         127);
		System.out.println("buffer.length() = " + buffer.length());
		buffer.setLong  ( 8,         127);
		System.out.println("buffer.length() = " + buffer.length());
		buffer.setFloat (16,      127.0F);
		System.out.println("buffer.length() = " + buffer.length());
		buffer.setDouble(20,      127.0D);

		System.out.println("buffer.length() = " + buffer.length());

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Author Closing Comment

by:zolf
ID: 41745919
cheers
0

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