Merge pull request 'core-java-strings 字符串压缩 Compact' (#43) from core-java-strings into main
Reviewed-on: https://src.ossez.com/cwiki-us-docs/java-tutorials/pulls/43
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@ -1,6 +1,7 @@
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=========
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## Annotation（注解）
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Java 注解（Annotation）又称 Java 标注，是 JDK5.0 引入的一种注释机制。
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## Core Java Cookbooks and Examples
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Java 语言中的类、方法、变量、参数和包等都可以被标注。和 Javadoc 不同，Java 标注可以通过反射获取标注内容。在编译器生成类文件时，标注可以被嵌入到字节码中。Java 虚拟机可以保留标注内容，在运行时可以获取到标注内容 。 当然它也支持自定义 Java 标注。
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### 相关的文章：
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- [Java @Override Annotation](https://www.baeldung.com/java-override)
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@ -43,7 +43,7 @@ public class NumberFormatExceptionTest {
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// Integer aIntegerObj = new Integer("one");
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// Double doubleDecimalObj = new Double("two.2");
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// Double doubleDecimalObj = new Double("two.2");
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}
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@ -3,14 +3,15 @@
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本模块中包含有关 Java 字符串（String）有关的文章。
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### 相关文章
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- [Java 使用 char[] Array 还是 String 存储字符串](https://www.ossez.com/t/java-char-array-string/14015)
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- [Compact Strings in Java 9](https://www.baeldung.com/java-9-compact-string)
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- [Java 使用 char[] Array 还是 String 存储字符串密码](https://www.ossez.com/t/java-char-array-string/14015)
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- [Java 9 中的字符串（String）压缩](https://www.ossez.com/t/java-9-string/14024)
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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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- [Java 中的 String Pool 简介](https://www.ossez.com/t/java-string-pool/14017)
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- [Fixing “constant string too long” Build Error](https://www.baeldung.com/java-constant-string-too-long-error)
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- [Java 对象如何安全的 toString](https://www.ossez.com/t/java-tostring/14000)
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- [编程常用的几种字符编码](https://www.ossez.com/t/topic/14022)
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@ -5,21 +5,22 @@ import java.util.stream.IntStream;
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import static java.util.stream.Collectors.toList;
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/**
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* Java 9 String Compact testing
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* <p>
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* <p><a href="https://www.ossez.com/t/java-9-string/14024">https://www.ossez.com/t/java-9-string/14024</a></p>
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*/
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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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List strings = IntStream.rangeClosed(1, 10_000_000).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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System.out.println("Generated " + strings.size() + " strings in " + 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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String appended = (String) strings.stream().limit(100_000).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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System.out.println("Created string of length " + appended.length() + " in " + totalTime + " ms.");
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}
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}
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@ -9,7 +9,7 @@ import static org.assertj.core.api.Assertions.assertThat;
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/**
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* Java Password by using String or Char array
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* <p>
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* * <p><a href="https://www.ossez.com/t/java-char-array-string/14015">https://www.ossez.com/t/java-char-array-string/14015</a></p>
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* <p><a href="https://www.ossez.com/t/java-char-array-string/14015">https://www.ossez.com/t/java-char-array-string/14015</a></p>
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*/
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public class PasswordStoreExamplesUnitTest {
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@ -2,6 +2,7 @@ package com.ossez.multiline;
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import org.junit.Test;
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import javax.swing.*;
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import java.io.IOException;
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import static org.junit.Assert.assertEquals;
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@ -3,37 +3,44 @@ package com.ossez.stringpool;
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import static org.assertj.core.api.Assertions.assertThat;
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import org.junit.Test;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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public class StringPoolUnitTest {
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private static Logger logger = LoggerFactory.getLogger(StringPoolUnitTest.class);
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@Test
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public void whenCreatingConstantStrings_thenTheirAddressesAreEqual() {
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String constantString1 = "Baeldung";
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String constantString2 = "Baeldung";
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String constantString1 = "HoneyMoose";
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String constantString2 = "HoneyMoose";
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assertThat(constantString1).isSameAs(constantString2);
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}
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@Test
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public void whenCreatingStringsWithTheNewOperator_thenTheirAddressesAreDifferent() {
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String newString1 = new String("Baeldung");
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String newString2 = new String("Baeldung");
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String newString1 = new String("HoneyMoose");
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String newString2 = new String("HoneyMoose");
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assertThat(newString1).isNotSameAs(newString2);
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logger.info("newString1 Address: {}", System.identityHashCode(newString1));
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logger.info("newString2 Address: {}", System.identityHashCode(newString2));
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}
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@Test
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public void whenComparingConstantAndNewStrings_thenTheirAddressesAreDifferent() {
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String constantString = "Baeldung";
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String newString = new String("Baeldung");
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String constantString = "HoneyMoose";
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String newString = new String("HoneyMoose");
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assertThat(constantString).isNotSameAs(newString);
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}
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@Test
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public void whenInterningAStringWithIdenticalValueToAnother_thenTheirAddressesAreEqual() {
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String constantString = "interned Baeldung";
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String newString = new String("interned Baeldung");
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String constantString = "interned HoneyMoose";
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String newString = new String("interned HoneyMoose");
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assertThat(constantString).isNotSameAs(newString);
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