Long longValue() Method in Java

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 does 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.  

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. 

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()