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更新 Java 字符串相关的内容和使用的版本
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‎core-java-modules/core-java-strings/README.md‎

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## Java Strings
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This module contains articles about strings in Java.
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### Relevant Articles:
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- [Use char[] Array over a String for Manipulating Passwords in Java?](https://www.baeldung.com/java-storing-passwords)
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- [Compact Strings in Java 9](https://www.baeldung.com/java-9-compact-string)
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- [String Not Empty Test Assertions in Java](https://www.baeldung.com/java-assert-string-not-empty)
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- [String Performance Hints](https://www.baeldung.com/java-string-performance)
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- [Java Localization – Formatting Messages](https://www.baeldung.com/java-localization-messages-formatting)
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- [Java – Generate Random String](https://www.baeldung.com/java-random-string)
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- [Java String Interview Questions and Answers](https://www.baeldung.com/java-string-interview-questions)
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- [Java Multi-line String](https://www.baeldung.com/java-multiline-string)
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- [Guide to Java String Pool](https://www.baeldung.com/java-string-pool)
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- [Fixing “constant string too long” Build Error](https://www.baeldung.com/java-constant-string-too-long-error)

‎core-java-modules/core-java-strings/src/main/java/com/baeldung/java9/compactstring/CompactStringDemo.java‎

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package com.baeldung.java9.compactstring;
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import java.util.List;
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import java.util.stream.IntStream;
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import static java.util.stream.Collectors.toList;
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public class CompactStringDemo {
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public static void main(String[] args) {
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long startTime = System.currentTimeMillis();
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List strings = IntStream.rangeClosed(1, 10_000_000)
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.mapToObj(Integer::toString).collect(toList());
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long totalTime = System.currentTimeMillis() - startTime;
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System.out.println("Generated " + strings.size() + " strings in "
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+ totalTime + " ms.");
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startTime = System.currentTimeMillis();
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String appended = (String) strings.stream().limit(100_000)
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.reduce("", (left, right) -> left.toString() + right.toString());
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totalTime = System.currentTimeMillis() - startTime;
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System.out.println("Created string of length " + appended.length()
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+ " in " + totalTime + " ms.");
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}
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}

‎core-java-modules/core-java-strings/src/main/java/com/baeldung/localization/App.java‎

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

‎core-java-modules/core-java-strings/src/main/java/com/baeldung/localization/ICUFormat.java‎

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

‎core-java-modules/core-java-strings/src/main/java/com/baeldung/localization/JavaSEFormat.java‎

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

‎core-java-modules/core-java-strings/src/main/java/com/baeldung/localization/Localization.java‎

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

‎core-java-modules/core-java-strings/src/main/java/com/baeldung/multiline/MultiLineString.java‎

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package com.baeldung.multiline;
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import com.google.common.base.Joiner;
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import com.google.common.collect.ImmutableList;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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public class MultiLineString {
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String newLine = System.getProperty("line.separator");
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public String stringConcatenation() {
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return "Get busy living"
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.concat(newLine)
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.concat("or")
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.concat(newLine)
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.concat("get busy dying.")
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.concat(newLine)
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.concat("--Stephen King");
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}
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public String stringJoin() {
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return String.join(newLine,
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"Get busy living",
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"or",
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"get busy dying.",
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"--Stephen King");
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}
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public String stringBuilder() {
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return new StringBuilder()
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.append("Get busy living")
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.append(newLine)
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.append("or")
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.append(newLine)
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.append("get busy dying.")
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.append(newLine)
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.append("--Stephen King")
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.toString();
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}
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public String stringWriter() {
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StringWriter stringWriter = new StringWriter();
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PrintWriter printWriter = new PrintWriter(stringWriter);
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printWriter.println("Get busy living");
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printWriter.println("or");
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printWriter.println("get busy dying.");
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printWriter.println("--Stephen King");
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return stringWriter.toString();
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}
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public String guavaJoiner() {
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return Joiner.on(newLine).join(ImmutableList.of("Get busy living",
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"or",
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"get busy dying.",
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"--Stephen King"));
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}
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public String loadFromFile() throws IOException {
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return new String(Files.readAllBytes(Paths.get("src/main/resources/stephenking.txt")));
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}
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// public String textBlocks() {
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//
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// // THIS ONLY FOR JDK 15
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// return """
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// Get busy living
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// or
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// get busy dying.
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// --Stephen King""";
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// }
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}

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