Java - Byte valueOf() method

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Description

The Java Byte valueOf(String s) returns a Byte object holding the value given by the specified String. The argument is interpreted as representing a signed decimal byte, exactly as if the argument were given to the parseByte(java.lang.String) method.

The result is a Byte object that represents the byte value specified by the string.

Declaration

Following is the declaration for java.lang.Byte.valueOf() method

public static Byte valueOf(String s) throws NumberFormatException

Parameters

s − the string to be parsed

Return Value

This method returns a Byte object holding the value represented by the string argument.

Exception

NumberFormatException − If the String does not contain a parsable byte.

Example 1

The following example shows the usage of Byte valueOf(String) method. We've created a String variable and assigned it a value. Then a Byte variable is created and using Byte.valueOf(String) method, the value of the string is parsed and printed.

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;

      /**
       *  static method is called using class name.
       *  assign Byte instance value of s to b
       */
      b = Byte.valueOf(s);

      String str = "Byte value of string " + s + " is " + b;

      // print b value
      System.out.println( str );
   }
}

Output

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

Byte value of string +120 is 120

Example 2

The following example shows the usage of Byte valueOf(String) method. We've created a String variable and assigned it a negative value. Then a Byte variable is created and using Byte.valueOf(String) method, the value of the string is parsed and printed.

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;

      /**
       *  static method is called using class name.
       *  assign Byte instance value of s to b
       */
      b = Byte.valueOf(s);

      String str = "Byte value of string " + s + " is " + b;

      // print b value
      System.out.println( str );
   }
}

Output

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

Byte value of string -120 is -120

Example 3

The following example shows the usage of Byte valueOf(String) method. We've created a String variable and assigned it a invalid value. Then a Byte variable is created and using Byte.valueOf(String) method, the value of the string is parsed and as expected a NumberFormatException occured.

package com.tutorialspoint;
public class ByteDemo {
   public static void main(String[] args) {

      // create a String s and assign value to it
      String s = "-1204";

      // create a Byte object b
      Byte b;

      /**
       *  static method is called using class name.
       *  assign Byte instance value of s to b
       */
      b = Byte.valueOf(s);

      String str = "Byte value of string " + s + " is " + b;

      // print b value
      System.out.println( str );
   }
}

Output

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

Exception in thread "main" java.lang.NumberFormatException: Value out of range. Value:"-1204" Radix:10
	at java.base/java.lang.Byte.parseByte(Byte.java:154)
	at java.base/java.lang.Byte.valueOf(Byte.java:208)
	at java.base/java.lang.Byte.valueOf(Byte.java:234)
	at com.tutorialspoint.ByteDemo.main(ByteDemo.java:17)