eugenp · eric-martin · Jun 1, 2025 · May 16, 2024 · May 23, 2024 · May 24, 2024
diff --git a/...a-modules/core-java-lang-3/src/main/java/com/baeldung/comparedouble/DoubleComparator.java b/...a-modules/core-java-lang-3/src/main/java/com/baeldung/comparedouble/DoubleComparator.java
@@ -1,8 +1,11 @@
 package com.baeldung.comparedouble;
 
+import java.math.BigDecimal;
+import java.math.RoundingMode;
 import java.util.Comparator;
 
 public class DoubleComparator implements Comparator<Double> {
+
     private double epsilon;
 
     public DoubleComparator(double epsilon) {
@@ -19,4 +22,12 @@ public int compare(Double d1, Double d2) {
             return 1; // d1 is greater than d2
         }
     }
+
+    public static boolean areEqual(double d1, double d2, int decimalPlaces) {
+        BigDecimal bd1 = BigDecimal.valueOf(d1)
+            .setScale(decimalPlaces, RoundingMode.HALF_UP);
+        BigDecimal bd2 = BigDecimal.valueOf(d2)
+            .setScale(decimalPlaces, RoundingMode.HALF_UP);
+        return bd1.equals(bd2);
+    }
 }
diff --git a/...ules/core-java-lang-3/src/test/java/com/baeldung/comparedouble/CompareDoubleUnitTest.java b/...ules/core-java-lang-3/src/test/java/com/baeldung/comparedouble/CompareDoubleUnitTest.java
@@ -1,11 +1,14 @@
 package com.baeldung.comparedouble;
 
 import com.google.common.math.DoubleMath;
+
 import org.apache.commons.math3.util.Precision;
 import org.junit.Test;
 
+import static com.baeldung.comparedouble.DoubleComparator.areEqual;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.Assert.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
 
 public class CompareDoubleUnitTest {
 
@@ -36,7 +39,6 @@ public void givenDoubleValuesThatShouldHaveSameValue_whenUsingGuavaFuzzyComparis
 
         double epsilon = 0.000001d;
 
-
         assertThat(DoubleMath.fuzzyEquals(d1, d2, epsilon)).isTrue();
     }
 
@@ -47,7 +49,6 @@ public void givenDoubleValuesThatShouldHaveSameValue_whenUsingCommonsMathCompari
 
         double epsilon = 0.000001d;
 
-
         assertThat(Precision.equals(d1, d2, epsilon)).isTrue();
         assertThat(Precision.equals(d1, d2)).isTrue();
     }
@@ -77,4 +78,13 @@ public void givenTwoEqualDoubleValues_whenUseComparator_thenReturnsZero() {
         int result = comparator.compare(d1, d2);
         assertEquals(0, result);
     }
+
+    @Test
+    public void givenTwoDoubleValues_whenUseSetScale_thenReturnAsExpected() {
+        double d1 = 0.7999999999999999;
+        double d2 = 0.8;
+
+        assertTrue(areEqual(d1, d2, 1), "Should be equal up to 1 decimal place");
+        assertTrue(areEqual(d1, d2, 2), "Should be equal up to 2 decimal places");
+    }
 }