Operations on "byte" Data Type Values

This section provides a tutorial example on how 'byte' values are casted to 'int' values when they are involved in arithmetic, comparison and bitwise operations.

Actually, there is no operations defined in Java that works directly on "byte" data type values.

But "byte" data type values can participate all operations defined for integer values. More precisely:

To validate those rules mentioned above, I wrote the following sample program, ByteOperations.java:

/* ByteOperations.java
 * Copyright (c) HerongYang.com. All Rights Reserved.
public class ByteOperations {
   public static void main(String[] arg) {
      byte b1 = 127;
      int o1 = (b1+b1-0)*5/10; // arithmetic operations

      byte b2 = 0x0000007F;
      boolean o2 = b2 > b2 || b2 != b2 || b2 == b2; // comparisons

      byte b3 = (byte) 127;
      int o3 = b3 & 0x0000000F | 0x00000070; // bitwise operations

      byte b4 = (byte) 0x0000007F;
      int o4 = b4 >> 4 << 4; // shift operations

      System.out.println("o1: "+o1);
      System.out.println("o2: "+o2);
      System.out.println("o3: "+o3);
      System.out.println("o4: "+o4);

After executing this program, I got this output with no surprises:

o1: 127
o2: true
o3: 127
o4: 112

Table of Contents

 About This Book

 JDK - Java Development Kit

 Execution Process, Entry Point, Input and Output

 Primitive Data Types and Literals

 Control Flow Statements

Bits, Bytes, Bitwise and Shift Operations

 What Are Bits and Bytes

 "byte" Data Type and Implicit Casting

Operations on "byte" Data Type Values

 Bitwise Operations on "byte" Values

 Bitwise Operations on "byte" Values - Example Program

 Shift Operations - Left, Right or Unsigned Right

 Managing Bit Strings in Byte Arrays

 Reference Data Types and Variables

 Enum Types and Enum Constants

 StringBuffer - The String Buffer Class

 System Properties and Runtime Object Methods

 Generic Classes and Parameterized Types

 Generic Methods and Type Inference

 Lambda Expressions and Method References

 Java Modules - Java Package Aggregation

 Execution Threads and Multi-Threading Java Programs

 ThreadGroup Class and "system" ThreadGroup Tree

 Synchronization Technique and Synchronized Code Blocks

 Deadlock Condition Example Programs

 Garbage Collection and the gc() Method

 Assert Statements and -ea" Option

 Annotation Statements and Declarations

 Java Related Terminologies

 Archived Tutorials


 Full Version in PDF/EPUB