Java Integer doubleValue() method

The doubleValue() method of Integer class returns a double value for this Integer after a widening primitive conversion.

Syntax

public double doubleValue()

Parameters

NA

Specified by

This method is specified by doubleValue in class Number

Return Value

This method returns the numeric value of this object after conversion to type double.

Example 1

public class JavaIntegerDoubleValueExample1 {
    public static void main(String[] args) {
        Integer val1=23;
        //returns a double value for this Integer
        double d1= val1.doubleValue();
        System.out.println(d1);
        Integer val2=45;
        System.out.println(val2.doubleValue());


    }
}

Output

23.0
45.0

Example 2

public class JavaIntegerDoubleValueExample2 {
    public static void main(String[] args) {
        Integer val1=23;
        //returns a double value for this Integer
        double d1= val1.doubleValue();
        Integer val2=45;
        double d2=val2.doubleValue();
        //calling the double class methods
        System.out.print(d1+"+"+d2+" : ");
        System.out.println(Double.sum(d1,d2));
    }
}

Output

23.0 + 45.0 : 68.0

Example 3

public class JavaIntegerDoubleValueExample3 {
    public static void main(String[] args) {
        Integer val1=23;
        //returns a double value for this Integer
        double d1= val1.doubleValue();
        Integer val2=45;
        double d2=val2.doubleValue();
        //calling the double class methods
        System.out.print("Greatest number between "+d1+" and "+d2+" : ");
        System.out.println(Double.max(d1,d2));
    }
}

Output

Greatest number between 23.0 and 45.0 : 45.0