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Java Number longValue() method with example

Number Class longValue() method: Here, we are going to learn about the longValue() method of Number Class with its syntax and example.
Submitted by Preeti Jain, on December 03, 2019

Number Class longValue() method

  • longValue() method is available in java.lang package.
  • longValue() method is used to return the value denoted by this Number object converted to type long (by casting ) and it may involve in rounding or truncations.
  • longValue() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • longValue() method does not throw an exception at the time of conversion from Number to long.


    public abstract long longValue();


  • It does not accept any parameter.

Return value:

The return type of this method is long, it returns a converted (from type number to long) value represented by this Number object.


// Java program to demonstrate the example 
// of longValue() method of Number class

public class LongValueOfNumberClass {
    public static void main(String[] args) {
        // Variables initialization
        float f1 = 10.58f;
        double d1 = 20.62;

        // It returns long value denoted by this object
        // and converted to a long by calling f.longValue()
        Float f = new Float(f1);

        // Display f result
        System.out.println("f.longValue(): " + f.longValue());

        // It returns long value denoted by this object
        // and converted to a long by calling d.longValue()
        Double d = new Double(d1);

        // Display d result
        System.out.println("d.longValue(): " + d.longValue());


f.longValue(): 10
d.longValue(): 20

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