Convert double to int Java

In this post, you will learn how to convert double to int using the Java programming language.

The Java double keyword is a primitive data type. This is used to declare the variables and methods. It generally represents the decimal numbers. Java double is used to represent floating-point numbers. It uses 64 bits to store a variable value and has a range greater than the float type.

The Java int keyword is a primitive data type. It is used to declare variables. It can also be used with methods to return integer type values. It can hold a 32-bit signed two's complement integer.

Here, we have used three methods to convert a double to int using the Java programming language.

Convert double to int using the intValue() method of Double class

The intValue() method of the Java Double class returns the value of this Double as an int by narrowing the primitive values or by casting to type int.

Syntax-

public int intValue()

This method does not accept any parameters. It returns the integer equivalent of the double-object that is created after conversion.

Example-

// Java program to convert String to Double
// Using intValue() method of Double class
import java.util.Scanner;  
public class ConvertStrToDouble
{  
    // Driver method
    public static void main(String[] args) 
    {  
        System.out.print("Enter the double value : ");  
        Scanner sc = new Scanner(System.in);  
        double i = sc.nextDouble();  
        Double n = i ;  
        int val = n.intValue();  
        
        //converting Double object into int
        System.out.println("Integer Value : " + val);  
    }
}

Output of the above code:

Enter the double value : 459.82
Integer Value : 459

Enter the double value : 732.12
Integer Value : 732

Enter the double value : 89.19
Integer Value : 89

Convert double to int using TypeCasting

Typecasting is the process in which the compiler automatically converts one data type in a program to another one. Typecasting in Java is performed through the typecast operator (datatype). Java primitive type double is bigger in size than the data type int. So, this typecasting is called 'downcasting' as we are converting bigger data type values to the smaller data type.

Syntax-

int IntValue = (int) DoubleValue;

Example-

// Java program to convert String to Double
// Using Typecasting
import java.util.Scanner;  
public class ConvertStrToDouble
{  
    // Driver method
    public static void main(String[] args) 
    {  
        System.out.print("Enter the double value : ");  
        Scanner sc = new Scanner(System.in);  
        double i = sc.nextDouble();  
        
        //converting Double object into int
        int value = (int)i;
        
        System.out.println("Integer Value : " + value);  
    }
}

Output of the above code:

Enter the double value : 894.22
Integer Value : 894

Enter the double value : 99.19
Integer Value : 99

Convert double to int using Math.round() method

The Math.round() method of Java rounds the specified value to the closest int or long value and returns it.

Syntax-

public static long round(double x)

Example-

// Java program to convert String to Double
// Using Math.round() method
import java.util.Scanner;  
public class ConvertStrToDouble
{  
    // Driver method
    public static void main(String[] args) 
    {  
        System.out.print("Enter the double value : ");  
        Scanner sc = new Scanner(System.in);  
        double data = sc.nextDouble();  
        
        // convert into int
        int value = (int)Math.round(data);
 
        // print the int value
        System.out.println("Integer Value : " + value);  
    }
}

Output of the above code:

Enter the double value : 899.94
Integer Value : 900

Enter the double value : 92.12
Integer Value : 92

Enter the double value : 92.96
Integer Value : 93

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