Merge pull request #8283 from sreekanthsnair/master

Double to Integer Casting (BAEL-3517)

java-numbers-3/pom.xml

@@ -0,0 +1,28 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>java-numbers-3</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>java-numbers-3</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+
+   
+    <build>
+        <finalName>java-numbers-3</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+</project>

java-numbers-3/src/main/java/com/baeldung/doubletolong/DoubleToLongUnitTest.java

@@ -0,0 +1,36 @@
+package com.baeldung.doubletolong;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class DoubleToLongUnitTest {
+
+    final static double VALUE = 9999.999;
+
+    @Test
+    public void givenDoubleValue_whenLongValueCalled_thenLongValueReturned() {
+        Assert.assertEquals(9999L, Double.valueOf(VALUE)
+            .longValue());
+    }
+
+    @Test
+    public void givenDoubleValue_whenMathRoundUseds_thenLongValueReturned() {
+        Assert.assertEquals(10000L, Math.round(VALUE));
+    }
+
+    @Test
+    public void givenDoubleValue_whenMathCeilUsed_thenLongValueReturned() {
+        Assert.assertEquals(10000L, Math.ceil(VALUE), 0);
+    }
+
+    @Test
+    public void givenDoubleValue_whenMathFloorUsed_thenLongValueReturned() {
+        Assert.assertEquals(9999L, Math.floor(VALUE), 0);
+    }
+
+    @Test
+    public void givenDoubleValue_whenTypeCasted_thenLongValueReturned() {
+        Assert.assertEquals(9999L, (long) VALUE);
+    }
+
+}