Java - Byte class with Examples

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Introduction

The Java Byte class class wraps a value of primitive type byte in an object. An object of type Byte contains a single field whose type is byte.

Class Declaration

Following is the declaration for java.lang.Byte class −

 public final class Byte extends Number implements Comparable<Byte>

Field

Following are the fields for java.lang.Byte class −

  • static byte MAX_VALUE − This is constant holding the maximum value a byte can have, 27-1.

  • static byte MIN_VALUE − This is constant holding the minimum value a byte can have, -27.

  • static int SIZE − This is the number of bits used to represent a byte value in two's complement binary form.

  • static Class<Byte> TYPE − This is the Class instance representing the primitive type byte.

Class constructors

Sr.No. Constructor & Description
1

Byte(byte value)

This constructs a newly allocated Byte object that represents the specified byte value.
2

Byte(String s)

This constructs a newly allocated Byte object that represents the byte value indicated by the String parameter.

Class methods

Sr.No. Method & Description
1 byte byteValue()

This method returns the value of this Byte as a byte.
2 int compareTo(Byte anotherByte)

This method compares two Byte objects numerically.
3 static Byte decode(String nm)

This method decodes a String into a Byte.
4 double doubleValue()

This method returns the value of this Byte as a double.
5 boolean equals(Object obj)

This method compares this object to the specified object.
6 float floatValue()

This method returns the value of this Byte as a float.
7 int hashCode()

This method returns a hash code for this Byte.
8 int intValue()

This method returns the value of this Byte as an int.
9 long longValue()

This method returns the value of this Byte as a long.
10 static byte parseByte(String s)

This method parses the string argument as a signed decimal byte.
11 static byte parseByte(String s, int radix)

This method parses the string argument as a signed byte in the radix specified by the second argument.
12 short shortValue()

This method returns the value of this Byte as a short.
13 String toString()

This method returns a String object representing this Byte's value.
14 static String toString(byte b)

This method returns a new String object representing the specified byte.
15 static Byte valueOf(byte b)

This method returns a Byte instance representing the specified byte value.
16 static Byte valueOf(String s)

This method returns a Byte object holding the value given by the specified String.
17 static Byte valueOf(String s, int radix)

This method returns a Byte object holding the value extracted from the specified String when parsed with the radix given by the second argument.

Methods inherited

This class inherits methods from the following classes −

  • java.lang.Object

Example

The following example shows the usage of Byte class to get byte from a string.

 package com.tutorialspoint; public class ByteDemo { public static void main(String[] args) { // create a String s and assign value to it String s = "+120"; // create a Byte object b Byte b; // get the value of byte from string b = Byte.valueOf(s); // print the value System.out.println( "Byte value of string " + s + " is " + b ); } }

Let us compile and run the above program, this will produce the following result −

 Byte value of string +120 is 120
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