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Java.lang.Long.valueOf() method with examples

  • Last Updated : 05 Dec, 2018

Java.lang.Long.valueOf() is a built-in method in Java of lang class that returns a Long object holding the value extracted from a specified String S when parsed with the radix that is given in the second argument. The first argument is interpreted as representing a signed long in the radix specified by the second argument, exactly as if the arguments were given to the parseLong(java.lang.String, int) method. It returns a result that is a Long object that represents the long value specified by the string.

Syntax:

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

Parameters: The method accepts two mandatory parameters:

  • S: This refers to the string which is to be parsed.
  • radix: This refers to the radix which is to be used in interpreting the string S.

Return type: The built-in method returns a Long object holding the value represented by the string argument in the specified radix.



Errors and Exception:

  • NumberFormatException: If the number does not contain a parsable long the program returns.

Below programs illustrate the Java.lang.Long.valueOf() method.

Program 1:




// Java program to demonstrate
// the java.lang.Long.valueOf() method
import java.lang.Math;
  
class Gfg1 {
  
    // driver code
    public static void main(String args[])
    {
        Long l = new Long(10);
        String str = "45325";
  
        // returns a Long instance representing 
        // the specified string with radix 10
        System.out.println("Long instance Value = " 
                               + l.valueOf(str, 10));
    }
}

Output:

Long instance Value = 45325

Program 2:




// Java program to demonstrate
// of java.lang.Long.valueOf() method
// NumberFormatException
import java.lang.Math;
  
class Gfg1 {
  
    // driver code
    public static void main(String args[])
    {
        Long l = new Long(10);
  
        // not a parsable long
        String str = "gopal";
  
        // returns a Long instance representing 
        // the specified string with radix 10
        System.out.println("Long instance Value = " 
                               + l.valueOf(str, 10));
    }
}

Output:

Exception in thread "main" java.lang.NumberFormatException: For input string: "gopal"
    at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
    at java.lang.Long.parseLong(Long.java:589)
    at java.lang.Long.valueOf(Long.java:776)
    at Gfg1.main(File.java:15)



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