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How to compare two double values in Java?

stackoverflow.com › questions › 8081827 › how-to-compare-two-double-values-in-java

Basically you shouldn't do exact comparisons, you should do something like this:

double a = 1.000001;
double b = 0.000001;
double c = a-b;
if (Math.abs(c-1.0) <= 0.000001) {...}

Answer from Kevin on Stack Overflow

Oracle

docs.oracle.com › javase › 8 › docs › api › java › lang › Double.html

Double (Java Platform SE 8 )

July 21, 2026 - Compares two Double objects numerically. There are two ways in which comparisons performed by this method differ from those performed by the Java language numerical comparison operators (<, <=, ==, >=, >) when applied to primitive double values:

GeeksforGeeks

geeksforgeeks.org › java › double-compare-method-in-java-with-examples

Double compare() Method in Java with Examples - GeeksforGeeks

July 11, 2025 - // Java Program to illustrate // the Double.compare() method import java.lang.Double; public class GFG { public static void main(String[] args) { // Get the two double values // to be compared Double d1 = 10d; Double d2 = 1023d; // function call to compare two double values if (Double.compare(d1, d2) == 0) { System.out.println("d1=d2"); } else if (Double.compare(d1, d2) < 0) { System.out.println("d1<d2"); } else { System.out.println("d1>d2"); } } }

Discussions

How do you compare two double values

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r/learnprogramming

October 17, 2023

Double vs BigDecimal in financial programming

Use long or big decimal. Performance problems will most probably arise elsewhere before you factor a big decimal as the culprit

Top answer

1 of 9

You can compare doubles just like you showed. Where it gets tricky is when you want to see if they are equal. That's because rounding errors may mean they are very close but not exactly equal. For example, if you calculate 10 / 3 * 3, the answer may be closer to 9.999 than 10. Then if you compare the values for equality, you may have a problem. In these cases, subtract the values and check they are close to what you need e.g. if (abs(a - b) < 0.0001) rather than if (a == b).

2 of 9

you take an epsilon (you pick a value of how small a difference between the two you consider the same). double e = 0.000000001 double diff = Math.abs(a - b); if (diff < e) { // equal } else if (a < b) { // a < b } else { // a > b } you pick your own value of epsilon. Mostly because each situation has different requirements.

Mtu

cclc.mtu.edu › java-doubles-and-floating-point-numbers

Java Doubles and Floating Point Numbers – CCLC

Another way to compare doubles is rounding. However, the more calculations, the greater the possibility that there will be larger rounding errors. Rounding is not always guaranteed to work. A third way to compare doubles is to use Java’s BigDecimal class to define floating point numbers.

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Medium

medium.com › @AlexanderObregon › javas-double-compare-method-explained-6159db37e326

Java’s Double.compare() Method Explained | Medium

December 23, 2024 - The Double.compare() method offers a consistent and reliable way to compare floating-point values in Java, handling special cases like NaN, infinities, and signed zeros with well-defined behavior.

DEV Community

dev.to › pavel_polivka › double-comparison-in-java-1b7

Double comparison in Java - DEV Community

May 12, 2021 - Simply, we will subtract those doubles, make absolute value, and compare if the result is smaller than some very small number. double epsilon = 0.000001d; boolean result = Math.abs(firstDouble - secondDouble) < epsilon; System.out.println(result); ...

Caff

caff.de › posts › double_comparison

de·caff · Double Equality

February 10, 2023 - The standard solution in Java is falling back to java.lang.Double#compare(double, double).

Coderanch

coderanch.com › t › 549438 › java › comparing-doubles-greater

comparing doubles with less than or greater than (Java in General forum at Coderanch)

August 16, 2011 - Chris Zaremba wrote:I understand that you shouldn't use equals for comparing two double values but does the same hold true for comparing a double to a literal using less than and greater than? Yes. campbell@computer_name:~/java$ java DoubleComparison 1.0 0.1 10 d3 < d1: ...

Scaler

scaler.com › home › topics › java double compare()

Java Double compare() - Scaler Topics

May 4, 2023 - The compare() method in Java Double class is a static method used to compare two double values.

EqualsVerifier

jqno.nl › equalsverifier › errormessages › double-equals-doesnt-use-doublecompare-for-field-foo

Double: equals doesn’t use Double.compare for field foo - EqualsVerifier

3 weeks ago - You should never use == to compare doubles or floats in an equals method. Always use Double.compare or Double.compareTo instead.

InterviewBit

interviewbit.com › java-interview-questions

90+ Core Java Interview Questions and Answers | Freshers & experienced

Java supports primitive data types - byte, boolean, char, short, int, float, long, and double and hence it is not a pure object oriented language.

Published: May 4, 2026

Playwright

playwright.dev › locator

Locator | Playwright

Locators are the central piece of Playwright's auto-waiting and retry-ability. In a nutshell, locators represent a way to find element(s) on the page at any moment. A locator can be created with the page.locator() method.

Tutorialspoint

tutorialspoint.com › java › lang › pdf › double_equals.pdf pdf

http://www.tutorialspoint.com/java/lang/double_equals.htm

The java.lang.Double.equals method compares this object against the specified object.

Baeldung

baeldung.com › home › java › core java › the double colon operator in java

The Double Colon Operator in Java | Baeldung

May 29, 2025 - As we’re starting to see, the double colon operator – introduced in Java 8 – will be very useful in some scenarios, and especially in conjunction with Streams.

Tutorialspoint

tutorialspoint.com › java › lang › pdf › double_compare.pdf pdf

http://www.tutorialspoint.com/java/lang/double_compare.htm

The java.lang.Double.compare method compares the two specified double values.

Tutorialspoint

tutorialspoint.com › java › lang › double_compare.htm

Java - Double compare() method

The Java Double compare() method compares the two specified double values. The sign of the integer value returned is the same as that of the integer that would be returned by the call − new Double(d1).compareTo(new Double(d2)) Following is the

LabEx

labex.io › tutorials › java-how-to-compare-double-values-based-on-their-binary-format-in-java-414887

How to compare double values based on their binary format in Java | LabEx

This tutorial will guide you through the process of comparing double values in Java based on their binary format. Understanding the representation of double in Java and the nuances of floating-point comparison are crucial for accurate and reliable comparisons.

W3Schools

w3schools.com › java › java_switch.asp

Java Switch

The result is compared with each case value.