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Move articles out of java-strings part5

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This commit is contained in:
catalin-burcea
2019-11-02 18:58:17 +02:00
parent de6e81bdb8
commit a15d1ef54e
56 changed files with 214 additions and 695 deletions
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25
core-java-modules/core-java-strings/src/main/java/com/baeldung/java9/compactstring/CompactStringDemo.java Normal file
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package com.baeldung.java9.compactstring;
import java.util.List;
import java.util.stream.IntStream;
import static java.util.stream.Collectors.toList;
public class CompactStringDemo {
public static void main(String[] args) {
long startTime = System.currentTimeMillis();
List strings = IntStream.rangeClosed(1, 10_000_000)
.mapToObj(Integer::toString).collect(toList());
long totalTime = System.currentTimeMillis() - startTime;
System.out.println("Generated " + strings.size() + " strings in "
+ totalTime + " ms.");
startTime = System.currentTimeMillis();
String appended = (String) strings.stream().limit(100_000)
.reduce("", (left, right) -> left.toString() + right.toString());
totalTime = System.currentTimeMillis() - startTime;
System.out.println("Created string of length " + appended.length()
+ " in " + totalTime + " ms.");
}
}

21
core-java-modules/core-java-strings/src/main/java/com/baeldung/localization/App.java Normal file
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package com.baeldung.localization;
import java.text.ParseException;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
public class App {
/**
* Runs all available formatter
* @throws ParseException
*/
public static void main(String[] args) {
List<Locale> locales = Arrays.asList(new Locale[] { Locale.UK, Locale.ITALY, Locale.FRANCE, Locale.forLanguageTag("pl-PL") });
Localization.run(locales);
JavaSEFormat.run(locales);
ICUFormat.run(locales);
}
}

29
core-java-modules/core-java-strings/src/main/java/com/baeldung/localization/ICUFormat.java Normal file
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package com.baeldung.localization;
import com.ibm.icu.text.MessageFormat;
import java.util.List;
import java.util.Locale;
import java.util.ResourceBundle;
public class ICUFormat {
public static String getLabel(Locale locale, Object[] data) {
ResourceBundle bundle = ResourceBundle.getBundle("formats", locale);
String format = bundle.getString("label-icu");
MessageFormat formatter = new MessageFormat(format, locale);
return formatter.format(data);
}
public static void run(List<Locale> locales) {
System.out.println("ICU formatter");
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 0 })));
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 1 })));
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 2 })));
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Alice", "female", 3 })));
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 0 })));
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 1 })));
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 2 })));
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { "Bob", "male", 3 })));
}
}

24
core-java-modules/core-java-strings/src/main/java/com/baeldung/localization/JavaSEFormat.java Normal file
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package com.baeldung.localization;
import java.text.MessageFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.ResourceBundle;
public class JavaSEFormat {
public static String getLabel(Locale locale, Object[] data) {
ResourceBundle bundle = ResourceBundle.getBundle("formats", locale);
final String pattern = bundle.getString("label");
final MessageFormat formatter = new MessageFormat(pattern, locale);
return formatter.format(data);
}
public static void run(List<Locale> locales) {
System.out.println("Java formatter");
final Date date = new Date(System.currentTimeMillis());
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { date, "Alice", 0 })));
locales.forEach(locale -> System.out.println(getLabel(locale, new Object[] { date, "Alice", 2 })));
}
}

18
core-java-modules/core-java-strings/src/main/java/com/baeldung/localization/Localization.java Normal file
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package com.baeldung.localization;
import java.util.List;
import java.util.Locale;
import java.util.ResourceBundle;
public class Localization {
public static String getLabel(Locale locale) {
final ResourceBundle bundle = ResourceBundle.getBundle("messages", locale);
return bundle.getString("label");
}
public static void run(List<Locale> locales) {
locales.forEach(locale -> System.out.println(getLabel(locale)));
}
}

67
core-java-modules/core-java-strings/src/main/java/com/baeldung/multiline/MultiLineString.java Normal file
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package com.baeldung.multiline;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.nio.file.Files;
import java.nio.file.Paths;
public class MultiLineString {
String newLine = System.getProperty("line.separator");
public String stringConcatenation() {
return "Get busy living"
.concat(newLine)
.concat("or")
.concat(newLine)
.concat("get busy dying.")
.concat(newLine)
.concat("--Stephen King");
}
public String stringJoin() {
return String.join(newLine,
"Get busy living",
"or",
"get busy dying.",
"--Stephen King");
}
public String stringBuilder() {
return new StringBuilder()
.append("Get busy living")
.append(newLine)
.append("or")
.append(newLine)
.append("get busy dying.")
.append(newLine)
.append("--Stephen King")
.toString();
}
public String stringWriter() {
StringWriter stringWriter = new StringWriter();
PrintWriter printWriter = new PrintWriter(stringWriter);
printWriter.println("Get busy living");
printWriter.println("or");
printWriter.println("get busy dying.");
printWriter.println("--Stephen King");
return stringWriter.toString();
}
public String guavaJoiner() {
return Joiner.on(newLine).join(ImmutableList.of("Get busy living",
"or",
"get busy dying.",
"--Stephen King"));
}
public String loadFromFile() throws IOException {
return new String(Files.readAllBytes(Paths.get("src/main/resources/stephenking.txt")));
}
}

196
core-java-modules/core-java-strings/src/main/java/com/baeldung/stringperformance/StringPerformance.java Normal file
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package com.baeldung.stringperformance;
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 = 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<String> stringSplit = new ArrayList<>();
protected List<String> stringTokenizer = new ArrayList<>();
@Benchmark
public String benchmarkStringDynamicConcat() {
result += baeldung;
return result;
}
@Benchmark
public StringBuilder benchmarkStringBuilder() {
StringBuilder stringBuilder = new StringBuilder(result);
stringBuilder.append(baeldung);
return stringBuilder;
}
@Benchmark
public StringBuffer benchmarkStringBuffer() {
StringBuffer stringBuffer = new StringBuffer(result);
stringBuffer.append(baeldung);
return stringBuffer;
}
@Benchmark
public String benchmarkStringConstructor() {
String result = new String("baeldung");
return result;
}
@Benchmark
public String benchmarkStringLiteral() {
String result = "baeldung";
return result;
}
@Benchmark
public String benchmarkStringFormat_s() {
return String.format(formatString, baeldung);
}
@Benchmark
public String benchmarkStringConcat() {
result = result.concat(baeldung);
return result;
}
@Benchmark
public String benchmarkStringIntern() {
return baeldung.intern();
}
@Benchmark
public String benchmarkStringReplace() {
return longString.replace("average", " average !!!");
}
@Benchmark
public String benchmarkStringUtilsReplace() {
return StringUtils.replace(longString, "average", " average !!!");
}
@Benchmark
public List<String> benchmarkGuavaSplitter() {
return Splitter.on(" ").trimResults()
.omitEmptyStrings()
.splitToList(longString);
}
@Benchmark
public String [] benchmarkStringSplit() {
return longString.split(emptyString);
}
@Benchmark
public String [] benchmarkStringSplitPattern() {
return spacePattern.split(longString, 0);
}
@Benchmark
public List benchmarkStringTokenizer() {
StringTokenizer st = new StringTokenizer(longString);
while (st.hasMoreTokens()) {
stringTokenizer.add(st.nextToken());
}
return stringTokenizer;
}
@Benchmark
public List benchmarkStringIndexOf() {
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 Integer.toString(sampleNumber);
}
@Benchmark
public String benchmarkStringValueOf() {
return String.valueOf(sampleNumber);
}
@Benchmark
public String benchmarkStringConvertPlus() {
return sampleNumber + "";
}
@Benchmark
public String benchmarkStringFormat_d() {
return String.format(formatDigit, sampleNumber);
}
@Benchmark
public boolean benchmarkStringEquals() {
return longString.equals(baeldung);
}
@Benchmark
public boolean benchmarkStringEqualsIgnoreCase() {
return longString.equalsIgnoreCase(baeldung);
}
@Benchmark
public boolean benchmarkStringMatches() {
return longString.matches(baeldung);
}
@Benchmark
public boolean benchmarkPrecompiledMatches() {
return longPattern.matcher(baeldung).matches();
}
@Benchmark
public int benchmarkStringCompareTo() {
return longString.compareTo(baeldung);
}
@Benchmark
public boolean benchmarkStringIsEmpty() {
return longString.isEmpty();
}
@Benchmark
public boolean benchmarkStringLengthZero() {
return longString.length() == 0;
}
public static void main(String[] args) throws Exception {
Options options = new OptionsBuilder()
.include(StringPerformance.class.getSimpleName()).threads(1)
.forks(1).shouldFailOnError(true)
.shouldDoGC(true)
.jvmArgs("-server").build();
new Runner(options).run();
}
}

2
core-java-modules/core-java-strings/src/main/resources/formats_en.properties Normal file
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label=On {0, date, short} {1} has sent you {2, choice, 0#no messages|1#a message|2#two messages|2<{2,number,integer} messages}.
label-icu={0} has sent you {2, plural, =0 {no messages} =1 {a message} other {{2, number, integer} messages}}.

2
core-java-modules/core-java-strings/src/main/resources/formats_fr.properties Normal file
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label={0, date, short}, {1}{2, choice, 0# ne|0<} vous a envoy\u00e9 {2, choice, 0#aucun message|1#un message|2#deux messages|2<{2,number,integer} messages}.
label-icu={0} {2, plural, =0 {ne } other {}}vous a envoy\u00e9 {2, plural, =0 {aucun message} =1 {un message} other {{2, number, integer} messages}}.

2
core-java-modules/core-java-strings/src/main/resources/formats_it.properties Normal file
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label={0, date, short} {1} ti ha inviato {2, choice, 0#nessun messagio|1#un messaggio|2#due messaggi|2<{2, number, integer} messaggi}.
label-icu={0} {2, plural, =0 {non } other {}}ti ha inviato {2, plural, =0 {nessun messaggio} =1 {un messaggio} other {{2, number, integer} messaggi}}.

2
core-java-modules/core-java-strings/src/main/resources/formats_pl.properties Normal file
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label=W {0, date, short} {1}{2, choice, 0# nie|0<} wys\u0142a\u0142a ci {2, choice, 0#\u017Cadnych wiadomo\u015Bci|1#wiadomo\u015B\u0107|2#dwie wiadomo\u015Bci|2<{2, number, integer} wiadomo\u015Bci}.
label-icu={0} {2, plural, =0 {nie } other {}}{1, select, male {wys\u0142a\u0142} female {wys\u0142a\u0142a} other {wys\u0142a\u0142o}} ci {2, plural, =0 {\u017Cadnej wiadomo\u015Bci} =1 {wiadomo\u015B\u0107} other {{2, number, integer} wiadomo\u015Bci}}.

13
core-java-modules/core-java-strings/src/main/resources/logback.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

1
core-java-modules/core-java-strings/src/main/resources/messages_en.properties Normal file
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label=Alice has sent you a message.

1
core-java-modules/core-java-strings/src/main/resources/messages_fr.properties Normal file
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label=Alice vous a envoy\u00e9 un message.

1
core-java-modules/core-java-strings/src/main/resources/messages_it.properties Normal file
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label=Alice ti ha inviato un messaggio.

1
core-java-modules/core-java-strings/src/main/resources/messages_pl.properties Normal file
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label=Alice wys\u0142a\u0142a ci wiadomo\u015B\u0107.

4
core-java-modules/core-java-strings/src/main/resources/stephenking.txt Normal file
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Get busy living
or
get busy dying.
--Stephen King