diff --git a/java-strings/src/main/java/com/baeldung/string/StringPerformance.java b/java-strings/src/main/java/com/baeldung/string/StringPerformance.java index 4873bd320c..3b0c32991c 100644 --- a/java-strings/src/main/java/com/baeldung/string/StringPerformance.java +++ b/java-strings/src/main/java/com/baeldung/string/StringPerformance.java @@ -1,23 +1,43 @@ package com.baeldung.string; +import com.google.common.base.Splitter; import org.apache.commons.lang3.StringUtils; import org.openjdk.jmh.annotations.*; import org.openjdk.jmh.runner.Runner; import org.openjdk.jmh.runner.options.Options; import org.openjdk.jmh.runner.options.OptionsBuilder; +import java.util.ArrayList; import java.util.List; +import java.util.StringTokenizer; import java.util.concurrent.TimeUnit; +import java.util.regex.Pattern; @BenchmarkMode(Mode.SingleShotTime) @OutputTimeUnit(TimeUnit.MILLISECONDS) -@Measurement(batchSize = 10000, iterations = 10) -@Warmup(batchSize = 10000, iterations = 10) -public class StringPerformance extends StringPerformanceHints { +@Measurement(batchSize = 100000, iterations = 10) +@Warmup(batchSize = 100000, iterations = 10) +@State(Scope.Thread) +public class StringPerformance { + + protected String baeldung = "baeldung"; + protected String longString = "Hello baeldung, I am a bit longer than other Strings"; + protected String formatString = "hello %s, nice to meet you"; + protected String formatDigit = "%d"; + protected String emptyString = " "; + protected String result = ""; + + protected int sampleNumber = 100; + + protected Pattern spacePattern = Pattern.compile(emptyString); + protected Pattern longPattern = Pattern.compile(longString); + protected List stringSplit = new ArrayList<>(); + protected List stringTokenizer = new ArrayList<>(); @Benchmark public String benchmarkStringDynamicConcat() { - return dynamicConcat(); + result += baeldung; + return result; } @Benchmark @@ -36,27 +56,30 @@ public class StringPerformance extends StringPerformanceHints { @Benchmark public String benchmarkStringConstructor() { - return stringConstructor(); + String result = new String("baeldung"); + return result; } @Benchmark public String benchmarkStringLiteral() { - return stringLiteral(); + String result = "baeldung"; + return result; } @Benchmark public String benchmarkStringFormat_s() { - return stringFormat_s(); + return String.format(formatString, baeldung); } @Benchmark public String benchmarkStringConcat() { - return stringConcat(); + result = result.concat(baeldung); + return result; } @Benchmark public String benchmarkStringIntern() { - return stringIntern(); + return baeldung.intern(); } @Benchmark @@ -71,85 +94,95 @@ public class StringPerformance extends StringPerformanceHints { @Benchmark public List benchmarkGuavaSplitter() { - return guavaSplitter(); + return Splitter.on(" ").trimResults() + .omitEmptyStrings() + .splitToList(longString); } @Benchmark public String [] benchmarkStringSplit() { - return stringSplit(); + return longString.split(emptyString); } @Benchmark public String [] benchmarkStringSplitPattern() { - return stringSplitPattern(); + return spacePattern.split(longString, 0); } @Benchmark public List benchmarkStringTokenizer() { - return stringTokenizer(); + StringTokenizer st = new StringTokenizer(longString); + while (st.hasMoreTokens()) { + stringTokenizer.add(st.nextToken()); + } + return stringTokenizer; } @Benchmark public List benchmarkStringIndexOf() { - return stringIndexOf(); + int pos = 0, end; + while ((end = longString.indexOf(' ', pos)) >= 0) { + stringSplit.add(longString.substring(pos, end)); + pos = end + 1; + } + return stringSplit; } - @Benchmark public String benchmarkIntegerToString() { - return stringIntegerToString(); + return Integer.toString(sampleNumber); } @Benchmark public String benchmarkStringValueOf() { - return stringValueOf(); + return String.valueOf(sampleNumber); } @Benchmark public String benchmarkStringConvertPlus() { - return stringConvertPlus(); + return sampleNumber + ""; } @Benchmark public String benchmarkStringFormat_d() { - return stringFormat_d(); + return String.format(formatDigit, sampleNumber); } @Benchmark public boolean benchmarkStringEquals() { - return stringEquals(); + return longString.equals(baeldung); } @Benchmark public boolean benchmarkStringEqualsIgnoreCase() { - return stringEqualsIgnoreCase(); + return longString.equalsIgnoreCase(baeldung); } @Benchmark public boolean benchmarkStringMatches() { - return stringIsMatch(); + return longString.matches(baeldung); } @Benchmark public boolean benchmarkPrecompiledMatches() { - return precompiledMatches(); + return longPattern.matcher(baeldung).matches(); } @Benchmark public int benchmarkStringCompareTo() { - return stringCompareTo(); + return longString.compareTo(baeldung); } @Benchmark public boolean benchmarkStringIsEmpty() { - return stringIsEmpty(); + return longString.isEmpty(); } @Benchmark public boolean benchmarkStringLengthZero() { - return stringLengthZero(); + return longString.length() == 0; } public static void main(String[] args) throws Exception { diff --git a/java-strings/src/main/java/com/baeldung/string/StringPerformanceHints.java b/java-strings/src/main/java/com/baeldung/string/StringPerformanceHints.java deleted file mode 100644 index 509222136f..0000000000 --- a/java-strings/src/main/java/com/baeldung/string/StringPerformanceHints.java +++ /dev/null @@ -1,133 +0,0 @@ -package com.baeldung.string; - -import com.google.common.base.Splitter; -import org.openjdk.jmh.annotations.Scope; -import org.openjdk.jmh.annotations.State; - -import java.util.ArrayList; -import java.util.List; -import java.util.StringTokenizer; -import java.util.regex.Pattern; - -@State(Scope.Thread) -public class StringPerformanceHints { - - protected String baeldung = "baeldung"; - protected String longString = "Hello baeldung, I am a bit longer than other Strings"; - protected String formatString = "hello %s, nice to meet you"; - protected String formatDigit = "%d"; - protected String emptyString = " "; - protected String result = ""; - - protected int sampleNumber = 100; - - protected Pattern spacePattern = Pattern.compile(emptyString); - protected Pattern longPattern = Pattern.compile(longString); - protected List stringSplit = new ArrayList<>(); - protected List stringTokenizer = new ArrayList<>(); - - protected String dynamicConcat() { - result += baeldung; - return result; - } - - protected String stringConstructor() { - return new String(baeldung); - } - - protected String stringLiteral() { - result = baeldung; - return result; - } - - protected String stringFormat_s() { - return String.format(formatString, baeldung); - } - - protected String stringFormat_d() { - return String.format(formatDigit, sampleNumber); - } - - protected String stringConcat() { - result = result.concat(baeldung); - return result; - } - - protected List stringTokenizer() { - StringTokenizer st = new StringTokenizer(longString); - while (st.hasMoreTokens()) { - stringTokenizer.add(st.nextToken()); - } - return stringTokenizer; - } - - protected List stringIndexOf() { - int pos = 0, end; - while ((end = longString.indexOf(' ', pos)) >= 0) { - stringSplit.add(longString.substring(pos, end)); - pos = end + 1; - } - return stringSplit; - } - - protected String stringIntegerToString() { - return Integer.toString(sampleNumber); - } - - protected String stringValueOf() { - return String.valueOf(sampleNumber); - } - - - protected String stringConvertPlus() { - return sampleNumber + ""; - } - - - protected boolean stringEquals() { - return longString.equals(baeldung); - } - - - protected boolean stringEqualsIgnoreCase() { - return longString.equalsIgnoreCase(baeldung); - } - - protected boolean stringIsMatch() { - return longString.matches(baeldung); - } - - protected boolean precompiledMatches() { - return longPattern.matcher(baeldung).matches(); - } - - protected int stringCompareTo() { - return longString.compareTo(baeldung); - } - - protected boolean stringIsEmpty() { - return longString.isEmpty(); - } - - protected boolean stringLengthZero() { - return longString.length() == 0; - } - - protected String [] stringSplitPattern() { - return spacePattern.split(longString, 0); - } - - protected String [] stringSplit() { - return longString.split(emptyString); - } - - protected List guavaSplitter() { - return Splitter.on(" ").trimResults() - .omitEmptyStrings() - .splitToList(longString); - } - - protected String stringIntern() { - return baeldung.intern(); - } -}