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BAEL-1065 Simple performance check StringBuffer vs StringBuilder. (eugenp#2512)
* Code for Dependency Injection Article. * Added Java based configuration. Downloaded formatter.xml and reformatted all changed files. Manually changed tab into 4 spaces in XML configuration files. * BAEL-434 - Spring Roo project files generated by Spring Roo. No formatting applied. Added POM, java and resources folders. * Moved project from roo to spring-roo folder. * BAEL-838 Initial code showing how to remove last char - helper class and tests. * BAEL-838 Corrected Helper class and associated empty string test case. Added StringUtils.substing tests. * BAEL-838 Refromatted code using formatter.xml. Added Assert.assertEquals import. Renamed test to follow convention. Reordered tests. * BAEL-838 - Added regex method and updated tests. * BAEL-838 Added new line examples. * BAEL-838 Renamed RemoveLastChar class to StringHelper and added Java8 examples. Refactord code. * BAEL-838 Changed method names * BAEL-838 Tiny change to keep code consistant. Return null or empty. * BAEL-838 Removed unresolved conflict. * BAEL-821 New class that shows different rounding techniques. Updated POM. * BAEL-821 - Added unit test for different round methods. * BAEL-821 Changed test method name to follow the convention * BAEL-821 Added more test and updated round methods. * BAEL-837 - initial commit. A few examples of adding doubles. * BAEL-837 - Couple of smaller changes * BAEL-837 - Added jUnit test. * BAEL-579 Updated Spring Cloud Version I was getting error: java.lang.NoSuchMethodError: org.springframework.cloud.config.environment.Environment After version update, all is okay. * BAEL-579 Added actuator to Cloud Config Client. * BAEL-579 Enabled cloud bus and updated dependencies. * BAEL-579 Config Client using Spring Cloud Bus. * BAEL-579 Recreated Basic Config Server. * BAEL-579 Recreated Config Client. * BAEL-579 Removed test Git URL. * BAEL-579 Added Actuator to Config Client * BAEL-579 Added Spring Cloud Bus to Client. * BAEL-579 Server changes for Spring Cloud Bus Added dependencies and removed git.clone-on-start as this was causing server to throw errors after git properties change. * BAEL-579 Removed Git URL. * Revert "BAEL-579 Updated Spring Cloud Version" This reverts commit f775bf9. * Revert "BAEL-579 Config Client using Spring Cloud Bus." This reverts commit 1d96bc5. * Revert "BAEL-579 Enabled cloud bus and updated dependencies." This reverts commit 7845da9. * Revert "BAEL-579 Added actuator to Cloud Config Client." This reverts commit 076657a. * BAEL-579 Added missing dependency versions. * BAEL-579 Added missing dependency versions. * Updated gitignore * BAEL-1065 Simple performance check StringBuffer vs StringBuilder. * BAEL-1065 Added JMH benchmarks
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‎.gitignore‎

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@@ -41,4 +41,5 @@ SpringDataInjectionDemo/.mvn/wrapper/maven-wrapper.properties
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spring-call-getters-using-reflection/.mvn/wrapper/maven-wrapper.properties
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spring-check-if-a-property-is-null/.mvn/wrapper/maven-wrapper.properties
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/vertx-and-rxjava/.vertx/
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*.springBeans
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‎core-java/pom.xml‎

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@@ -372,6 +372,31 @@
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</arguments>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.codehaus.mojo</groupId>
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<artifactId>exec-maven-plugin</artifactId>
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<executions>
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<execution>
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<id>run-benchmarks</id>
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<phase>integration-test</phase>
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<goals>
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<goal>exec</goal>
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</goals>
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<configuration>
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<classpathScope>test</classpathScope>
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<executable>java</executable>
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<arguments>
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<argument>-classpath</argument>
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<classpath />
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<argument>org.openjdk.jmh.Main</argument>
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<argument>.*</argument>
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</arguments>
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</configuration>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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<maven-compiler-plugin.version>3.6.0</maven-compiler-plugin.version>
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<maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
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</properties>
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</project>
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</project>

‎core-java/src/main/java/com/baeldung/string/StringBufferStringBuilder.java‎

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package com.baeldung.string;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.runner.Runner;
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import org.openjdk.jmh.runner.RunnerException;
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import org.openjdk.jmh.runner.options.Options;
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import org.openjdk.jmh.runner.options.OptionsBuilder;
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public class StringBufferStringBuilder {
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public static void main(String[] args) throws RunnerException {
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Options opt = new OptionsBuilder()
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.include(StringBufferStringBuilder.class.getSimpleName())
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.build();
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new Runner(opt).run();
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}
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@State(Scope.Benchmark)
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public static class MyState {
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int iterations = 1000;
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String initial = "abc";
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String suffix = "def";
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}
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@Benchmark
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public StringBuffer benchmarkStringBuffer(MyState state) {
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StringBuffer stringBuffer = new StringBuffer(state.initial);
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for (int i = 0; i < state.iterations; i++) {
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stringBuffer.append(state.suffix);
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}
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return stringBuffer;
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}
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@Benchmark
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public StringBuilder benchmarkStringBuilder(MyState state) {
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StringBuilder stringBuilder = new StringBuilder(state.initial);
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for (int i = 0; i < state.iterations; i++) {
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stringBuilder.append(state.suffix);
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}
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return stringBuilder;
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}
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}

‎core-java/src/test/java/com/baeldung/maths/RoundTest.java‎

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@@ -15,56 +15,56 @@ public class RoundTest {
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private double expected = 2.03d;
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@Test
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public void givenDecimalNumber_whenRoundToNDecimalPlaces_thenGetExpectedResult() {
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public void givenDecimalNumber_whenRoundToNDecimalPlaces_thenGetExpectedResult() {
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
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Assert.assertEquals(expected, Round.roundAvoid(value, places), delta);
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
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places = 3;
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expected = 2.035d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
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Assert.assertEquals(expected, Round.roundAvoid(value, places), delta);
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
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value = 1000.0d;
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places = 17;
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expected = 1000.0d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
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Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 92.23372036854776 !
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertEquals(expected, DoubleRounder.round(value, places), delta);
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value = 256.025d;
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places = 2;
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expected = 256.03d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertNotEquals(expected, Round.roundNotPrecise(value, places), delta); // Returns: 256.02 !
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Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 256.02 !
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertNotEquals(expected, DoubleRounder.round(value, places), delta); // Returns: 256.02 !
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value = 260.775d;
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value = 260.775d;
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places = 2;
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expected = 260.78d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertNotEquals(expected, Round.roundNotPrecise(value, places), delta); // Returns: 260.77 !
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Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 260.77 !
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Assert.assertEquals(expected, Precision.round(value, places), delta);
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Assert.assertNotEquals(expected, DoubleRounder.round(value, places), delta); // Returns: 260.77 !
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value = 90080070060.1d;
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places = 9;
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expected = 90080070060.1d;
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Assert.assertEquals(expected, Round.round(value, places), delta);
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Assert.assertEquals(expected, Round.roundNotPrecise(value, places), delta);
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Assert.assertNotEquals(expected, Round.roundAvoid(value, places), delta); // Returns: 9.223372036854776E9 !

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