diff --git a/java-numbers-2/.gitignore b/java-numbers-2/.gitignore new file mode 100644 index 0000000000..3de4cc647e --- /dev/null +++ b/java-numbers-2/.gitignore @@ -0,0 +1,26 @@ +*.class + +0.* + +#folders# +/target +/neoDb* +/data +/src/main/webapp/WEB-INF/classes +*/META-INF/* +.resourceCache + +# Packaged files # +*.jar +*.war +*.ear + +# Files generated by integration tests +*.txt +backup-pom.xml +/bin/ +/temp + +#IntelliJ specific +.idea/ +*.iml \ No newline at end of file diff --git a/java-numbers-2/pom.xml b/java-numbers-2/pom.xml new file mode 100644 index 0000000000..57f1154f53 --- /dev/null +++ b/java-numbers-2/pom.xml @@ -0,0 +1,135 @@ + + 4.0.0 + java-numbers-2 + 0.1.0-SNAPSHOT + java-numbers-2 + jar + + + com.baeldung + parent-java + 0.0.1-SNAPSHOT + ../parent-java + + + + + log4j + log4j + ${log4j.version} + + + org.slf4j + slf4j-api + ${org.slf4j.version} + + + ch.qos.logback + logback-classic + ${logback.version} + + + org.openjdk.jmh + jmh-core + ${jmh-core.version} + + + org.openjdk.jmh + jmh-generator-annprocess + ${jmh-generator.version} + + + org.apache.commons + commons-math3 + ${commons-math3.version} + + + org.apache.commons + commons-lang3 + ${commons-lang3.version} + + + org.decimal4j + decimal4j + ${decimal4j.version} + + + org.assertj + assertj-core + ${assertj.version} + test + + + + + java-numbers-2 + + + src/main/resources + true + + + + + + + org.apache.maven.plugins + maven-javadoc-plugin + ${maven-javadoc-plugin.version} + + 1.8 + 1.8 + + + + + + + + integration + + + + org.apache.maven.plugins + maven-surefire-plugin + + + integration-test + + test + + + + **/*IntegrationTest.java + + + + + + + json + + + + + + + + + + 3.6.1 + 1.0.3 + 3.5 + + 3.6.1 + + 1.7.21 + 1.1.7 + + 2.21.0 + 3.0.0-M1 + 3.0.2 + + diff --git a/java-numbers-2/src/test/java/com/baeldung/lossyconversion/ConversionTechniquesUnitTest.java b/java-numbers-2/src/test/java/com/baeldung/lossyconversion/ConversionTechniquesUnitTest.java new file mode 100644 index 0000000000..2001f39359 --- /dev/null +++ b/java-numbers-2/src/test/java/com/baeldung/lossyconversion/ConversionTechniquesUnitTest.java @@ -0,0 +1,68 @@ +package com.baeldung.lossyconversion; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertTrue; + +import org.junit.jupiter.api.Test; + +public class ConversionTechniquesUnitTest { + + @Test + public void testPrimitiveConversion() { + + long longNum = 24; + short shortNum = (short) longNum; + assertEquals(24, shortNum); + + double doubleNum = 15.6; + int integerNum = (int) doubleNum; + assertEquals(15, integerNum); + + long largeLongNum = 32768; + short minShortNum = (short) largeLongNum; + assertEquals(-32768, minShortNum); + + long smallLongNum = -32769; + short maxShortNum = (short) smallLongNum; + assertEquals(32767, maxShortNum); + + long maxLong = Long.MAX_VALUE; + int minInt = (int) maxLong; + assertEquals(-1, minInt); + + long minLong = Long.MIN_VALUE; + int maxInt = (int) minLong; + assertEquals(0, maxInt); + } + + @Test + public void testWrapperToPrimitiveConversion() { + + Float floatNum = 17.564f; + long longNum = floatNum.longValue(); + assertEquals(17, longNum); + + Double doubleNum = 15.9999; + longNum = doubleNum.longValue(); + assertEquals(15, longNum); + } + + @Test + public void testWrapperToPrimitiveConversionUsingMathRound() { + + Double doubleNum = 15.9999; + long longNum = Math.round(doubleNum); + assertEquals(16, longNum); + } + + @Test + public void testWrapperConversion() { + + Double doubleNum = 10.3; + double dbl = doubleNum.doubleValue(); //unboxing + int intgr = (int) dbl; //downcasting + Integer intNum = Integer.valueOf(intgr); + assertEquals(Integer.valueOf(10), intNum); + } + +} diff --git a/pom.xml b/pom.xml index f40659bc16..33411ca43a 100644 --- a/pom.xml +++ b/pom.xml @@ -461,6 +461,7 @@ java-lite java-numbers + java-numbers-2 java-rmi java-spi java-streams @@ -987,7 +988,6 @@ jws libraries - persistence-modules/hibernate5 persistence-modules/hibernate-mapping persistence-modules/java-jpa @@ -1147,6 +1147,7 @@ java-ee-8-security-api java-lite java-numbers + java-numbers-2 java-rmi java-spi java-streams