Java Program to convert double type variables to int

To understand this example, you should have the knowledge of the following Java programming topics:

Example 1: Java Program to Convert double to int using Typecasting

``````class Main {
public static void main(String[] args) {

// create double variables
double a = 23.78D;
double b = 52.11D;

// convert double into int
// using typecasting
int c = (int)a;
int d = (int)b;

System.out.println(c);    // 23
System.out.println(d);    // 52
}
}``````

In the above example, we have `double` type variables a and b. Notice the line,

``int c = (int)a;``

Here, the higher data type `double` is converted into a lower data type `int`. Hence, we need to explicitly use `int` inside the bracket.

Note: This process works when the value of double is less than or equal to the maximum value of `int` (2147483647). Otherwise, there will be a loss in data.

Example 2: Convert double to int using Math.round()

We can also convert the `double` type variable into `int` using the `Math.round()` method. For example,

``````class Main {
public static void main(String[] args) {

// create double variables
double a = 99.99D;
double b = 52.11D;

// convert double into int
// using typecasting
int c = (int)Math.round(a);
int d = (int)Math.round(b);

System.out.println(c);    // 100
System.out.println(d);    // 52
}
}``````

In the above example, we have created two `double` variables named a and b. Notice the line,

``int c = (int)Math.round(a);``

Here,

• Math.round(a) - converts the `decimal` value into `long` value
• (int) - converts the `long` value into `int` using typecasting

The `Math.round()` method rounds the decimal value to the closest long value. To learn more, visit the Java Math round().

Example 3: Java Program to Convert Double to int

We can also convert an instance of `Double` class to `int` using the `intValue()` method. For example,

``````class Main {
public static void main(String[] args) {

// create an instance of Double
Double obj = 78.6;

// convert obj to int
// using intValue()
int num = obj.intValue();

// print the int value
System.out.println(num);    // 78
}
}``````

Here, we have used the `intValue()` method to convert the object of `Double` to `int`.

The `Double` is a wrapper class in Java. To learn more, visit the Java Wrapper Class.