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Long longValue() Method in Java

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  • Last Updated : 13 Dec, 2021
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The java.lang.Long.longValue() is an inbuilt method of the Long class in Java which returns the value of this Long object as a long after the conversion.
Syntax: 

public long longValue()

Parameters: This method do not take any parameters.
Return Value: This method will return the numeric value represented by this object after conversion to long type.
Examples:  

Input: 5366623
Output: (Long) 5366623

Input: -6723887
Output: (Long) -6723887
Explanation:
When the number is passed in this object it will convert that 
to long and gives the value like,
Long lobject = new Long(5366623)
It will return 5366623 as long.

Below programs illustrate the working of java.lang.Long.longValue() method. 
Program 1: For a positive number.  

java




// Java program to illustrate the
// java.lang.Long.longValue() method
 
import java.lang.*;
 
public class Geek {
 
    public static void main(String[] args)
    {
 
        Long lobject = new Long(77387187);
 
        // It will return the value of this Long as a long
        long nl = lobject.longValue();
        System.out.println("The Value of nl as long is = " + nl);
 
        Long lobject2 = new Long(-6723887);
 
        // It will return the value of this Long as a long
        long nl2 = lobject2.longValue();
        System.out.println("The Value of nl2 as long is = " + nl2);
    }
}

Output: 

The Value of nl as long is = 77387187
The Value of nl2 as long is = -6723887

 

Program 2: For a very large no. 
// It will produce compile time error. 

java




// Java program to illustrate the
// java.lang.Long.longValue() method
import java.lang.*;
 
public class Geek {
 
    public static void main(String[] args)
    {
 
        Long lobject = new Long(97387717187);
 
        // Very large number will produce compile errors
        long nl = lobject.longValue();
        System.out.println("The Value of nl as long is = " + nl);
    }
}

Output: 

prog.java:9: error: integer number too large: 97387717187
    Long lobject = new Long(97387717187);
                            ^
1 error

 

Reference: https://docs.oracle.com/javase/7/docs/api/java/lang/Long.html#longValue() 


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