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添加 Optional 类的测试文件和文章说明连接： https://www.ossez.com/t/java-8-optional/13964

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This commit is contained in:
YuCheng Hu 2022-05-16 09:45:35 -04:00
parent dfd51f0723
commit 74a9a9ed0b
2 changed files with 17 additions and 17 deletions
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2
core-java-modules/core-java-11-2/README.md
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@ -3,7 +3,7 @@
本模块中包含有关 Java 11 核心新增功能的的一些文章 本模块中包含有关 Java 11 核心新增功能的的一些文章
### 相关文章 ### 相关文章
- [Guide to Java 8 Optional](https://www.baeldung.com/java-optional) - [Java 8 开始新增的 Optional 类](https://www.ossez.com/t/java-8-optional/13964)
- [Guide to Java Reflection](http://www.baeldung.com/java-reflection) - [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
- [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors) - [Guide to Java 8’s Collectors](https://www.baeldung.com/java-8-collectors)
- [New Features in Java 11](https://www.baeldung.com/java-11-new-features) - [New Features in Java 11](https://www.baeldung.com/java-11-new-features)

32
core-java-modules/core-java-11-2/src/test/java/com/ossez/optional/OptionalUnitTest.java
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@ -76,16 +76,16 @@ public class OptionalUnitTest {
// Condition Action With ifPresent() // Condition Action With ifPresent()
@Test @Test
public void givenOptional_whenIfPresentWorks_thenCorrect() { public void givenOptional_whenIfPresentWorks_thenCorrect() {
Optional<String> opt = Optional.of("baeldung"); Optional<String> opt = Optional.of("HoneyMoose");
opt.ifPresent(name -> LOG.debug("{}", name.length())); opt.ifPresent(name -> LOG.debug("{}", name.length()));
} }
// returning Value With get() // returning Value With get()
@Test @Test
public void givenOptional_whenGetsValue_thenCorrect() { public void givenOptional_whenGetsValue_thenCorrect() {
Optional<String> opt = Optional.of("baeldung"); Optional<String> opt = Optional.of("HoneyMoose");
String name = opt.get(); String name = opt.get();
assertEquals("baeldung", name); assertEquals("HoneyMoose", name);
} }
@Test(expected = NoSuchElementException.class) @Test(expected = NoSuchElementException.class)
@ -96,13 +96,23 @@ public class OptionalUnitTest {
@Test @Test
public void givenAnEmptyOptional_thenIsEmptyBehavesAsExpected() { public void givenAnEmptyOptional_thenIsEmptyBehavesAsExpected() {
Optional<String> opt = Optional.of("Baeldung"); Optional<String> opt = Optional.of("HoneyMoose");
assertTrue(opt.isPresent()); assertTrue(opt.isPresent());
opt = Optional.ofNullable(null); opt = Optional.ofNullable(null);
assertFalse(opt.isPresent()); assertFalse(opt.isPresent());
} }
// This code only can be run in JDK 11
@Test
public void givenAnEmptyOptional_thenIsEmptyBehavesAsExpected_JDK11() {
Optional<String> opt = Optional.of("Baeldung");
assertFalse(opt.isEmpty());
opt = Optional.ofNullable(null);
assertTrue(opt.isEmpty());
}
// Conditional Return With filter() // Conditional Return With filter()
@Test @Test
public void whenOptionalFilterWorks_thenCorrect() { public void whenOptionalFilterWorks_thenCorrect() {
@ -157,11 +167,11 @@ public class OptionalUnitTest {
@Test @Test
public void givenOptional_whenMapWorks_thenCorrect2() { public void givenOptional_whenMapWorks_thenCorrect2() {
String name = "baeldung"; String name = "HoneyMoose";
Optional<String> nameOptional = Optional.of(name); Optional<String> nameOptional = Optional.of(name);
int len = nameOptional.map(String::length).orElse(0); int len = nameOptional.map(String::length).orElse(0);
assertEquals(8, len); assertEquals(10, len);
} }
@Test @Test
@ -214,7 +224,6 @@ public class OptionalUnitTest {
String nullName = null; String nullName = null;
String name = Optional.ofNullable(nullName).orElseGet(() -> "john"); String name = Optional.ofNullable(nullName).orElseGet(() -> "john");
assertEquals("john", name); assertEquals("john", name);
} }
@Test @Test
@ -259,14 +268,5 @@ public class OptionalUnitTest {
return "Default Value"; return "Default Value";
} }
// Uncomment code when code base is compatible with Java 11
// @Test
// public void givenAnEmptyOptional_thenIsEmptyBehavesAsExpected() {
// Optional<String> opt = Optional.of("Baeldung");
// assertFalse(opt.isEmpty());
//
// opt = Optional.ofNullable(null);
// assertTrue(opt.isEmpty());
// }
} }