is there a possibility that casting a double created via
Math.round()will still result in a truncated down number
No, round() will always round your double to the correct value, and then, it will be cast to an long which will truncate any decimal places. But after rounding, there will not be any fractional parts remaining.
Here are the docs from Math.round(double):
Answer from jjnguy on Stack OverflowReturns the closest long to the argument. The result is rounded to an integer by adding 1/2, taking the floor of the result, and casting the result to type long. In other words, the result is equal to the value of the expression:
(long)Math.floor(a + 0.5d)
Top answer 1 of 3
116
is there a possibility that casting a double created via
Math.round()will still result in a truncated down number
No, round() will always round your double to the correct value, and then, it will be cast to an long which will truncate any decimal places. But after rounding, there will not be any fractional parts remaining.
Here are the docs from Math.round(double):
Returns the closest long to the argument. The result is rounded to an integer by adding 1/2, taking the floor of the result, and casting the result to type long. In other words, the result is equal to the value of the expression:
(long)Math.floor(a + 0.5d)
2 of 3
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For the datatype Double to int, you can use the following:
Double double = 5.00;
int integer = double.intValue();
This truncates (floors), and does not round. Use at your own risk.
GeeksforGeeks
geeksforgeeks.org › java › convert-double-to-integer-in-java
Convert Double to Integer in Java - GeeksforGeeks
class GFG { public static void main(String[] args) { Double data = 3452.345; System.out.println("Double: " + data); int value = data.intValue(); System.out.println("Integer: " + value); } } ... Fractional digits are removed.
Published December 20, 2025
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Educative
educative.io › answers › how-to-convert-a-double-to-int-in-java
How to convert a double to int in Java
Since double is a bigger data type than int, it needs to be down-casted. See the syntax below: ... 0.50.5 to the value and truncating its decimal points. The long value can then be converted to an int using typecasting.
Vultr Docs
docs.vultr.com › java › examples › convert-double-type-variables-to-int
Java Program to convert double type variables to int | Vultr Docs
December 9, 2024 - Implement Math.ceil() to find the smallest integer greater than or equal to the given double. Convert the resulting floating point to an int through casting.
BeginnersBook
beginnersbook.com › 2018 › 09 › java-convert-double-to-int
Java double to int Conversion
double myDouble = 9.99; int myInt = (int) myDouble; System.out.println(myInt); // Output: 9 · If you want the nearest integer as output, you can use Math.round() method. This method returns a long value so you need to cast it to convert it into an int.
Blogger
javarevisited.blogspot.com › 2017 › 01 › how-to-convert-double-to-int-in-java.html
How to convert double to int in Java? Example
Since double is bigger data type than int, it needs to be down-casted as shown below: int value = (int) 6.14; // 6 int score = (int) 6.99; // 6 If you remember, floating-point numbers are by default double in Java, so you don't need any suffix, unlike representing float values. As I said, casting gets rid of anything after decimal so even 6.999 gets converted into 6.
Coderanch
coderanch.com › t › 667275 › java › Double-Integer-Conversion
Double to Integer Conversion (Beginning Java forum at Coderanch)
If you convert a double to an int, the result will be in the range −2³¹…2³¹ − 1. The range of a double is much bigger, and you can find the largest and smallest values in the Documentation. So you have lots of double numbers outwith the range of int values. I think the simplest way to do that sort of conversion is to use a cast, officially called a narrowing primitive conversion, and you can read all about it in the Java® Language Specification (=JLS).
Edureka
edureka.co › blog › double-to-int-in-java
How To Convert Double To Int in Java?
November 27, 2019 - As we all know, a Double primitive contains decimal digits. On conversion of these values to integers, the decimal digits get truncated, by rounding off the number to the nearest integer according to the method you choose. Java provides the following three ways to convert Double values to integer numbers:
GeeksforGeeks
geeksforgeeks.org › java › 5-ways-to-convert-double-to-integer-in-java
5 Ways to Convert Double to Integer in Java - GeeksforGeeks
January 2, 2024 - Math.round() takes a double value and rounds it to the nearest long value. This is done by incrementing the value by 0.5 and rounding the long value to the nearest integer. The long value is then converted to an integer using typecasting.
PrepBytes
prepbytes.com › home › java › how to convert double to int in java
How to Convert Double to Int in Java
August 12, 2024 - Conclusion Converting a double to an int in Java is a straightforward process, but it requires an understanding of how Java handles data types and the potential loss of information due to truncation. Whether you use explicit casting, the Math.round() method, or other techniques, it’s important to choose the right method based on your specific needs.
Programiz
programiz.com › java-programming › examples › double-to-int-conversion
Java Program to convert double type variables to int
We can also convert an instance of Double class to int using the intValue() method.
Reddit
reddit.com › r/javahelp › pls help me with converting double value to int value.
r/javahelp on Reddit: Pls help me with converting Double value to Int value.
July 31, 2018 -
I tried to cast it but the value still cant be converted. int quarter = (int)Monetary/0.25;//monetary is a double value it says there is an incompatible types error. Pls help me.
Just Academy
justacademy.co › blog-detail › how-to-convert-double-to-int-in-java
How to Convert Double to Int in Java
It’s important to note that ... to an int in Java, you can simply cast the double value to an int like this: int intValue = (int) doubleValue;....
Reddit
reddit.com › r/codinghelp › need help with converting double into integer in java
r/CodingHelp on Reddit: Need help with converting double into integer in java
September 8, 2023 -
In my code I try to convert the double that a person would input into the console to an integer but I don't understand why it would not happen
Code is here https://onlinegdb.com/eILtFt5gg
Top answer 1 of 2
1
Double myDouble = myDoubleInput.nextDouble(); it should be a lowercase d: double myDouble = myDoubleInput.nextDouble();
2 of 2
1
You are trying to cast a Double object into an “int” primitive. The cast doesn’t automatically converts the value, autoboxing doesn’t work this way. You should use some function inside Double to convert it to integer
Software Testing Help
softwaretestinghelp.com › home › java › 3 methods to convert double to int in java
3 Methods To Convert Double To Int In Java
April 1, 2025 - In this tutorial, we will be exploring three methods to convert data from primitive data type double to int in Java with examples.
Asjava
asjava.com › home › java: convert double to int – essential guide
How to Convert Double to Int in Java: Simple Guide
March 20, 2024 - Perform Type Casting: Utilize type casting syntax, encapsulating the double value within parentheses followed by the target data type (int). This action instructs Java to perform the conversion; Retrieve Converted Value: Assign the result of ...
Scaler
scaler.com › home › topics › program to convert double to int in java
Program to Convert Double to Int in Java - Scaler Topics
November 21, 2022 - The simplest approach to converting a double to an int in Java is downcasting it. This will return the non-fractional half of the integer as an int. However, it does not round to the nearest integer.
Blogger
javahungry.blogspot.com › 2018 › 12 › convert-double-to-int-in-java.html
3 ways : Convert double to int in java with example | Java Hungry
In this example I will be converting double to int using typecasting. Typecasting is done by mentioning int in the brackets before the decimal value. The only downside of the typecasting is that it will truncate the decimal digits from the double value. It will not round of to the nearest value.
WsCube Tech
wscubetech.com › resources › java › programs › double-to-int
Convert Double to Integer in Java (7 Programs)
October 18, 2025 - Learn 7 simple ways to convert a Double to Integer in Java. Explore examples using type casting, Math.floor(), Math.round(), and more. Read now!