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添加 Java 中的 String Pool 简介 内容

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This commit is contained in:
YuCheng Hu 2022-06-20 17:26:15 -04:00
parent de42646567
commit b7d0d45f28
2 changed files with 16 additions and 9 deletions
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2
core-java-modules/core-java-strings/README.md
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@ -11,6 +11,6 @@
- [Java – Generate Random String](https://www.baeldung.com/java-random-string)
- [Java String Interview Questions and Answers](https://www.baeldung.com/java-string-interview-questions)
- [Java Multi-line String](https://www.baeldung.com/java-multiline-string)
- [Guide to Java String Pool](https://www.baeldung.com/java-string-pool)
- [Java 中的 String Pool 简介](https://www.ossez.com/t/java-string-pool/14017)
- [Fixing “constant string too long” Build Error](https://www.baeldung.com/java-constant-string-too-long-error)
- [Java 对象如何安全的 toString](https://www.ossez.com/t/java-tostring/14000)

23
core-java-modules/core-java-strings/src/test/java/com/ossez/stringpool/StringPoolUnitTest.java
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@ -3,37 +3,44 @@ package com.ossez.stringpool;
import static org.assertj.core.api.Assertions.assertThat;
import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class StringPoolUnitTest {
private static Logger logger = LoggerFactory.getLogger(StringPoolUnitTest.class);
@Test
public void whenCreatingConstantStrings_thenTheirAddressesAreEqual() {
String constantString1 = "Baeldung";
String constantString2 = "Baeldung";
String constantString1 = "HoneyMoose";
String constantString2 = "HoneyMoose";
assertThat(constantString1).isSameAs(constantString2);
}
@Test
public void whenCreatingStringsWithTheNewOperator_thenTheirAddressesAreDifferent() {
String newString1 = new String("Baeldung");
String newString2 = new String("Baeldung");
String newString1 = new String("HoneyMoose");
String newString2 = new String("HoneyMoose");
assertThat(newString1).isNotSameAs(newString2);
logger.info("newString1 Address: {}", System.identityHashCode(newString1));
logger.info("newString2 Address: {}", System.identityHashCode(newString2));
}
@Test
public void whenComparingConstantAndNewStrings_thenTheirAddressesAreDifferent() {
String constantString = "Baeldung";
String newString = new String("Baeldung");
String constantString = "HoneyMoose";
String newString = new String("HoneyMoose");
assertThat(constantString).isNotSameAs(newString);
}
@Test
public void whenInterningAStringWithIdenticalValueToAnother_thenTheirAddressesAreEqual() {
String constantString = "interned Baeldung";
String newString = new String("interned Baeldung");
String constantString = "interned HoneyMoose";
String newString = new String("interned HoneyMoose");
assertThat(constantString).isNotSameAs(newString);