Java Byte valueOf() Method

The Byte.valueOf() method in Java is used to convert a byte primitive or a String to a Byte object. This method has multiple versions to handle different use cases, including converting a string representation of a number in a specified radix (base) to a Byte object.

Table of Contents

1. Introduction
2. valueOf() Method Syntax
3. Overloaded Versions
   • valueOf(byte b)
   • valueOf(String s)
   • valueOf(String s, int radix)
4. Examples
   • Converting a byte to Byte
   • Converting a String to Byte
   • Converting a String with a Radix to Byte
5. Real-World Use Case
6. Conclusion

Introduction

The Byte.valueOf() method is a static method in the Byte class in Java. It converts primitive byte values and String representations of numbers into Byte objects. This method is useful when you need to work with Byte objects instead of primitive byte values, such as when working with collections or APIs that require objects.

valueOf()() Method Syntax

There are three primary overloaded versions of the valueOf() method in the Byte class:

1. public static Byte valueOf(byte b)
2. public static Byte valueOf(String s) throws NumberFormatException
3. public static Byte valueOf(String s, int radix) throws NumberFormatException

Overloaded Versions

1. valueOf(byte b)

This method converts the primitive byte value b to a Byte object.

public static Byte valueOf(byte b)

• b: The byte value to be converted to a Byte object.

The method returns:

• A Byte object representing the specified byte value.

2. valueOf(String s)

This method converts the string s to a Byte object.

public static Byte valueOf(String s) throws NumberFormatException

• s: The string to be converted to a Byte object.

The method returns:

• A Byte object representing the value of the specified string.

Throws:

• NumberFormatException if the string does not contain a parsable byte.

3. valueOf(String s, int radix)

This method converts the string s to a Byte object using the specified radix.

public static Byte valueOf(String s, int radix) throws NumberFormatException

• s: The string to be converted to a Byte object.
• radix: The radix to be used in interpreting the string.

The method returns:

• A Byte object representing the value of the specified string in the specified radix.

Throws:

• NumberFormatException if the string does not contain a parsable byte.

Examples

Converting a byte to Byte

The valueOf(byte b) method converts a primitive byte to a Byte object.

Example

public class ValueOfByteExample {
    public static void main(String[] args) {
        byte number = 123;
        Byte byteObject = Byte.valueOf(number);

        System.out.println("Byte object: " + byteObject);
    }
}

Output:

Byte object: 123

In this example, the primitive byte 123 is converted to a Byte object.

Converting a String to Byte

The valueOf(String s) method converts a string to a Byte object.

Example

public class ValueOfStringExample {
    public static void main(String[] args) {
        String numberString = "45";
        Byte byteObject = Byte.valueOf(numberString);

        System.out.println("Byte object: " + byteObject);
    }
}

Output:

Byte object: 45

In this example, the string "45" is converted to a Byte object.

Converting a String with a Radix to Byte

The valueOf(String s, int radix) method converts a string in a specified radix to a Byte object.

Example

public class ValueOfStringWithRadixExample {
    public static void main(String[] args) {
        String binaryString = "1101";
        Byte byteObject = Byte.valueOf(binaryString, 2);

        System.out.println("Byte object (binary): " + byteObject);

        String hexString = "7F";
        byteObject = Byte.valueOf(hexString, 16);

        System.out.println("Byte object (hexadecimal): " + byteObject);
    }
}

Output:

Byte object (binary): 13
Byte object (hexadecimal): 127

In this example, the binary string "1101" is converted to the byte value 13, and the hexadecimal string "7F" is converted to the byte value 127.

Real-World Use Case

Parsing Configuration Values

In a real-world application, you might use the Byte.valueOf() method to parse configuration values from a properties file or environment variables.

Example

import java.util.Properties;

public class ConfigurationExample {
    public static void main(String[] args) {
        Properties properties = new Properties();
        properties.setProperty("maxRetries", "3");
        properties.setProperty("timeout", "30");

        Byte maxRetries = Byte.valueOf(properties.getProperty("maxRetries"));
        Byte timeout = Byte.valueOf(properties.getProperty("timeout"));

        System.out.println("Max Retries: " + maxRetries);
        System.out.println("Timeout: " + timeout);
    }
}

Output:

Max Retries: 3
Timeout: 30

In this example, the configuration values are parsed from a properties file and converted to byte values using the Byte.valueOf() method.

Conclusion

The Byte.valueOf() method in Java is a versatile tool for converting byte values and String representations of numbers into Byte objects. By understanding how to use the different overloaded versions of this method, you can efficiently handle tasks that involve creating and working with Byte objects in your Java applications. Whether you are dealing with base 10, different numeral systems, or parsing configuration values, the valueOf() method provides a reliable solution for these tasks.