Convert int to double in Java

Tags: double int Integer Convert

In this Java core tutorial, we learn how to convert int to double value in Java via different solutions.

Assign int variable to a double variable

ConvertIntToDoubleExample1.java 

public class ConvertIntToDoubleExample1 {
    public static void main(String[] args) {
        int value1 = 2021;
        double value2 = value1;

        System.out.println("int value: " + value1);
        System.out.println("double value: " + value2);
    }
}
The output is: 
int value: 2021
double value: 2021.0

How to use Double.valueOf() method to instantiate new Double object

ConvertIntToDoubleExample2.java 

public class ConvertIntToDoubleExample2 {
    public static void main(String[] args) {
        int value1 = 1999;
        Double value2 = Double.valueOf(value1);

        System.out.println("int value: " + value1);
        System.out.println("double value: " + value2);
    }
}
The output is: 
int value: 1999
double value: 1999.0

How to use Integer.doubleValue() method to get double value of an Integer

ConvertIntToDoubleExample3.java 

public class ConvertIntToDoubleExample3 {
    public static void main(String[] args) {
        int value1 = 12;
        Integer integerValue = value1;
        double value2 = integerValue.doubleValue();

        System.out.println("int value: " + value1);
        System.out.println("double value: " + value2);
    }
}
The output is: 
int value: 12
double value: 12.0

Happy Coding 😊

Convert double to int in Java