From 076de3f006be1687b600bbb9ca86a9e1ebebdd36 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Fran=C3=A7ois=20Dupire?= Date: Thu, 22 Nov 2018 17:22:47 +0100 Subject: [PATCH] BAEL-2309 Retrieving a Class Name in Java (#5716) * [BAEL-2309] SomeClass and its test * [BAEL-2309] Fixing test naming * [BAEL-2309] Changed name for RetrievingClassName * [BAEL-2309] Updating package name * [BAEL-2309] Fix comment mistake * [BAEL-2309] Fixing test class name --- .../className/RetrievingClassName.java | 9 + .../RetrievingClassNameUnitTest.java | 156 ++++++++++++++++++ 2 files changed, 165 insertions(+) create mode 100644 core-java/src/main/java/com/baeldung/className/RetrievingClassName.java create mode 100644 core-java/src/test/java/com/baeldung/className/RetrievingClassNameUnitTest.java diff --git a/core-java/src/main/java/com/baeldung/className/RetrievingClassName.java b/core-java/src/main/java/com/baeldung/className/RetrievingClassName.java new file mode 100644 index 0000000000..ab6c8a51ff --- /dev/null +++ b/core-java/src/main/java/com/baeldung/className/RetrievingClassName.java @@ -0,0 +1,9 @@ +package com.baeldung.className; + +public class RetrievingClassName { + + public class InnerClass { + + } + +} diff --git a/core-java/src/test/java/com/baeldung/className/RetrievingClassNameUnitTest.java b/core-java/src/test/java/com/baeldung/className/RetrievingClassNameUnitTest.java new file mode 100644 index 0000000000..f9dbf91d2c --- /dev/null +++ b/core-java/src/test/java/com/baeldung/className/RetrievingClassNameUnitTest.java @@ -0,0 +1,156 @@ +package com.baeldung.className; + +import org.junit.Test; + +import static org.junit.Assert.assertEquals; +import static org.junit.Assert.assertNull; + +public class RetrievingClassNameUnitTest { + + // Retrieving Simple Name + @Test + public void givenRetrievingClassName_whenGetSimpleName_thenRetrievingClassName() { + assertEquals("RetrievingClassName", RetrievingClassName.class.getSimpleName()); + } + + @Test + public void givenPrimitiveInt_whenGetSimpleName_thenInt() { + assertEquals("int", int.class.getSimpleName()); + } + + @Test + public void givenRetrievingClassNameArray_whenGetSimpleName_thenRetrievingClassNameWithBrackets() { + assertEquals("RetrievingClassName[]", RetrievingClassName[].class.getSimpleName()); + assertEquals("RetrievingClassName[][]", RetrievingClassName[][].class.getSimpleName()); + } + + @Test + public void givenAnonymousClass_whenGetSimpleName_thenEmptyString() { + assertEquals("", new RetrievingClassName() {}.getClass().getSimpleName()); + } + + // Retrieving Other Names + // - Primitive Types + @Test + public void givenPrimitiveInt_whenGetName_thenInt() { + assertEquals("int", int.class.getName()); + } + + @Test + public void givenPrimitiveInt_whenGetTypeName_thenInt() { + assertEquals("int", int.class.getTypeName()); + } + + @Test + public void givenPrimitiveInt_whenGetCanonicalName_thenInt() { + assertEquals("int", int.class.getCanonicalName()); + } + + // - Object Types + @Test + public void givenRetrievingClassName_whenGetName_thenCanonicalName() { + assertEquals("com.baeldung.className.RetrievingClassName", RetrievingClassName.class.getName()); + } + + @Test + public void givenRetrievingClassName_whenGetTypeName_thenCanonicalName() { + assertEquals("com.baeldung.className.RetrievingClassName", RetrievingClassName.class.getTypeName()); + } + + @Test + public void givenRetrievingClassName_whenGetCanonicalName_thenCanonicalName() { + assertEquals("com.baeldung.className.RetrievingClassName", RetrievingClassName.class.getCanonicalName()); + } + + // - Inner Classes + @Test + public void givenRetrievingClassNameInnerClass_whenGetName_thenCanonicalNameWithDollarSeparator() { + assertEquals("com.baeldung.className.RetrievingClassName$InnerClass", RetrievingClassName.InnerClass.class.getName()); + } + + @Test + public void givenRetrievingClassNameInnerClass_whenGetTypeName_thenCanonicalNameWithDollarSeparator() { + assertEquals("com.baeldung.className.RetrievingClassName$InnerClass", RetrievingClassName.InnerClass.class.getTypeName()); + } + + @Test + public void givenRetrievingClassNameInnerClass_whenGetCanonicalName_thenCanonicalName() { + assertEquals("com.baeldung.className.RetrievingClassName.InnerClass", RetrievingClassName.InnerClass.class.getCanonicalName()); + } + + // - Anonymous Classes + @Test + public void givenAnonymousClass_whenGetName_thenCallingClassCanonicalNameWithDollarSeparatorAndCountNumber() { + // These are the second and third appearences of an anonymous class in RetrievingClassNameUnitTest, hence $2 and $3 expectations + assertEquals("com.baeldung.className.RetrievingClassNameUnitTest$2", new RetrievingClassName() {}.getClass().getName()); + assertEquals("com.baeldung.className.RetrievingClassNameUnitTest$3", new RetrievingClassName() {}.getClass().getName()); + } + + @Test + public void givenAnonymousClass_whenGetTypeName_thenCallingClassCanonicalNameWithDollarSeparatorAndCountNumber() { + // These are the fourth and fifth appearences of an anonymous class in RetrievingClassNameUnitTest, hence $4 and $5 expectations + assertEquals("com.baeldung.className.RetrievingClassNameUnitTest$4", new RetrievingClassName() {}.getClass().getTypeName()); + assertEquals("com.baeldung.className.RetrievingClassNameUnitTest$5", new RetrievingClassName() {}.getClass().getTypeName()); + } + + @Test + public void givenAnonymousClass_whenGetCanonicalName_thenNull() { + assertNull(new RetrievingClassName() {}.getClass().getCanonicalName()); + } + + // - Arrays + @Test + public void givenPrimitiveIntArray_whenGetName_thenOpeningBracketsAndPrimitiveIntLetter() { + assertEquals("[I", int[].class.getName()); + assertEquals("[[I", int[][].class.getName()); + } + + @Test + public void givenRetrievingClassNameArray_whenGetName_thenOpeningBracketsLetterLAndRetrievingClassNameGetName() { + assertEquals("[Lcom.baeldung.className.RetrievingClassName;", RetrievingClassName[].class.getName()); + assertEquals("[[Lcom.baeldung.className.RetrievingClassName;", RetrievingClassName[][].class.getName()); + } + + @Test + public void givenRetrievingClassNameInnerClassArray_whenGetName_thenOpeningBracketsLetterLAndRetrievingClassNameInnerClassGetName() { + assertEquals("[Lcom.baeldung.className.RetrievingClassName$InnerClass;", RetrievingClassName.InnerClass[].class.getName()); + assertEquals("[[Lcom.baeldung.className.RetrievingClassName$InnerClass;", RetrievingClassName.InnerClass[][].class.getName()); + } + + @Test + public void givenPrimitiveIntArray_whenGetTypeName_thenPrimitiveIntGetTypeNameWithBrackets() { + assertEquals("int[]", int[].class.getTypeName()); + assertEquals("int[][]", int[][].class.getTypeName()); + } + + @Test + public void givenRetrievingClassNameArray_whenGetTypeName_thenRetrievingClassNameGetTypeNameWithBrackets() { + assertEquals("com.baeldung.className.RetrievingClassName[]", RetrievingClassName[].class.getTypeName()); + assertEquals("com.baeldung.className.RetrievingClassName[][]", RetrievingClassName[][].class.getTypeName()); + } + + @Test + public void givenRetrievingClassNameInnerClassArray_whenGetTypeName_thenRetrievingClassNameInnerClassGetTypeNameWithBrackets() { + assertEquals("com.baeldung.className.RetrievingClassName$InnerClass[]", RetrievingClassName.InnerClass[].class.getTypeName()); + assertEquals("com.baeldung.className.RetrievingClassName$InnerClass[][]", RetrievingClassName.InnerClass[][].class.getTypeName()); + } + + @Test + public void givenPrimitiveIntArray_whenGetCanonicalName_thenPrimitiveIntGetCanonicalNameWithBrackets() { + assertEquals("int[]", int[].class.getCanonicalName()); + assertEquals("int[][]", int[][].class.getCanonicalName()); + } + + @Test + public void givenRetrievingClassNameArray_whenGetCanonicalName_thenRetrievingClassNameGetCanonicalNameWithBrackets() { + assertEquals("com.baeldung.className.RetrievingClassName[]", RetrievingClassName[].class.getCanonicalName()); + assertEquals("com.baeldung.className.RetrievingClassName[][]", RetrievingClassName[][].class.getCanonicalName()); + } + + @Test + public void givenRetrievingClassNameInnerClassArray_whenGetCanonicalName_thenRetrievingClassNameInnerClassGetCanonicalNameWithBrackets() { + assertEquals("com.baeldung.className.RetrievingClassName.InnerClass[]", RetrievingClassName.InnerClass[].class.getCanonicalName()); + assertEquals("com.baeldung.className.RetrievingClassName.InnerClass[][]", RetrievingClassName.InnerClass[][].class.getCanonicalName()); + } + +} \ No newline at end of file