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Java Number doubleValue() method with example

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

Number Class doubleValue() method

• doubleValue() method is available in java.lang package.
• doubleValue() method is used to return the value denoted by this Number object converted to type double (by casting) and it may involve in rounding or truncation.
• doubleValue() 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.
• doubleValue() method does not throw an exception at the time of conversion from Number to double.

Syntax:

    public abstract double doubleValue();

Parameter(s):

• It does not accept any parameter.

Return value:

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

Example:

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

public class DoubleValueOfNumberClass {
    public static void main(String[] args) {
        // Variables initialization
        int i1 = 10;
        float f1 = 20.62f;

        // It returns double value denoted by this object
        // and converted to a double by calling i.doubleValue()
        Integer i = new Integer(i1);

        // Display i result
        System.out.println("i.doubleValue(): " + i.doubleValue());

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

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

Output

i.doubleValue(): 10.0
f.doubleValue(): 20.6200008392334