From fc1bb6b7b1cb1e66587198cb84fd1710e2d29164 Mon Sep 17 00:00:00 2001 From: Egima profile Date: Mon, 5 Sep 2016 10:20:45 +0300 Subject: [PATCH] made changes to java reflection (#667) --- .../java/reflection/ReflectionTest.java | 28 +- reflection/pom.xml | 30 -- .../java/com/baeldung/reflection/Animal.java | 23 -- .../java/com/baeldung/reflection/Bird.java | 36 -- .../java/com/baeldung/reflection/Eating.java | 5 - .../java/com/baeldung/reflection/Goat.java | 24 -- .../com/baeldung/reflection/Locomotion.java | 5 - .../java/com/baeldung/reflection/Person.java | 6 - .../baeldung/reflection/ReflectionTest.java | 323 ------------------ 9 files changed, 14 insertions(+), 466 deletions(-) delete mode 100644 reflection/pom.xml delete mode 100644 reflection/src/main/java/com/baeldung/reflection/Animal.java delete mode 100644 reflection/src/main/java/com/baeldung/reflection/Bird.java delete mode 100644 reflection/src/main/java/com/baeldung/reflection/Eating.java delete mode 100644 reflection/src/main/java/com/baeldung/reflection/Goat.java delete mode 100644 reflection/src/main/java/com/baeldung/reflection/Locomotion.java delete mode 100644 reflection/src/main/java/com/baeldung/reflection/Person.java delete mode 100644 reflection/src/test/java/com/baeldung/reflection/ReflectionTest.java diff --git a/core-java/src/test/java/com/baeldung/java/reflection/ReflectionTest.java b/core-java/src/test/java/com/baeldung/java/reflection/ReflectionTest.java index 6a0ad7d34f..6639096ad1 100644 --- a/core-java/src/test/java/com/baeldung/java/reflection/ReflectionTest.java +++ b/core-java/src/test/java/com/baeldung/java/reflection/ReflectionTest.java @@ -8,9 +8,7 @@ import java.lang.reflect.Method; import java.lang.reflect.Modifier; import java.util.Arrays; import java.util.List; -import java.util.stream.Stream; - -import static java.util.stream.Collectors.toList; +import java.util.ArrayList; import static org.junit.Assert.*; public class ReflectionTest { @@ -24,7 +22,6 @@ public class ReflectionTest { assertTrue(Arrays.asList("name", "age") .containsAll(actualFieldNames)); - } @Test @@ -311,16 +308,19 @@ public class ReflectionTest { } - private static List getMethodNames(Method[] methods) { - return Stream.of(methods) - .map((Method::getName)) - .collect(toList()); - } + private static List getFieldNames(Field[] fields) { + List fieldNames = new ArrayList<>(); + for (Field field : fields) + fieldNames.add(field.getName()); + return fieldNames; - private static List getFieldNames(Field[] fields) { - return Stream.of(fields) - .map(Field::getName) - .collect(toList()); - } + } + + private static List getMethodNames(Method[] methods) { + List methodNames = new ArrayList<>(); + for (Method method : methods) + methodNames.add(method.getName()); + return methodNames; + } } diff --git a/reflection/pom.xml b/reflection/pom.xml deleted file mode 100644 index 10a6d7df0c..0000000000 --- a/reflection/pom.xml +++ /dev/null @@ -1,30 +0,0 @@ - - 4.0.0 - com.baeldung - reflection - 1.0 - reflection - - - - org.apache.maven.plugins - maven-compiler-plugin - 3.3 - - 8 - 8 - - - - - - - junit - junit - 4.3 - test - - - - diff --git a/reflection/src/main/java/com/baeldung/reflection/Animal.java b/reflection/src/main/java/com/baeldung/reflection/Animal.java deleted file mode 100644 index 364246ae64..0000000000 --- a/reflection/src/main/java/com/baeldung/reflection/Animal.java +++ /dev/null @@ -1,23 +0,0 @@ -package com.baeldung.reflection; - -public abstract class Animal implements Eating { - - public static final String CATEGORY = "domestic"; - - private String name; - - public Animal(String name) { - this.name = name; - } - - public String getName() { - return name; - } - - public void setName(String name) { - this.name = name; - } - - protected abstract String getSound(); - -} diff --git a/reflection/src/main/java/com/baeldung/reflection/Bird.java b/reflection/src/main/java/com/baeldung/reflection/Bird.java deleted file mode 100644 index f5bb0f9b19..0000000000 --- a/reflection/src/main/java/com/baeldung/reflection/Bird.java +++ /dev/null @@ -1,36 +0,0 @@ -package com.baeldung.reflection; - -public class Bird extends Animal { - private boolean walks; - - public Bird() { - super("bird"); - } - - public Bird(String name, boolean walks) { - super(name); - setWalks(walks); - } - - public Bird(String name) { - super(name); - } - - @Override - public String eats() { - return "grains"; - } - - @Override - protected String getSound() { - return "chaps"; - } - - public boolean walks() { - return walks; - } - - public void setWalks(boolean walks) { - this.walks = walks; - } -} diff --git a/reflection/src/main/java/com/baeldung/reflection/Eating.java b/reflection/src/main/java/com/baeldung/reflection/Eating.java deleted file mode 100644 index c959becf00..0000000000 --- a/reflection/src/main/java/com/baeldung/reflection/Eating.java +++ /dev/null @@ -1,5 +0,0 @@ -package com.baeldung.reflection; - -public interface Eating { - String eats(); -} diff --git a/reflection/src/main/java/com/baeldung/reflection/Goat.java b/reflection/src/main/java/com/baeldung/reflection/Goat.java deleted file mode 100644 index 086d09d543..0000000000 --- a/reflection/src/main/java/com/baeldung/reflection/Goat.java +++ /dev/null @@ -1,24 +0,0 @@ -package com.baeldung.reflection; - -public class Goat extends Animal implements Locomotion { - - public Goat(String name) { - super(name); - } - - @Override - protected String getSound() { - return "bleat"; - } - - @Override - public String getLocomotion() { - return "walks"; - } - - @Override - public String eats() { - return "grass"; - } - -} diff --git a/reflection/src/main/java/com/baeldung/reflection/Locomotion.java b/reflection/src/main/java/com/baeldung/reflection/Locomotion.java deleted file mode 100644 index 230fd9a466..0000000000 --- a/reflection/src/main/java/com/baeldung/reflection/Locomotion.java +++ /dev/null @@ -1,5 +0,0 @@ -package com.baeldung.reflection; - -public interface Locomotion { - String getLocomotion(); -} diff --git a/reflection/src/main/java/com/baeldung/reflection/Person.java b/reflection/src/main/java/com/baeldung/reflection/Person.java deleted file mode 100644 index 1a1fafef93..0000000000 --- a/reflection/src/main/java/com/baeldung/reflection/Person.java +++ /dev/null @@ -1,6 +0,0 @@ -package com.baeldung.reflection; - -public class Person { - private String name; - private int age; -} diff --git a/reflection/src/test/java/com/baeldung/reflection/ReflectionTest.java b/reflection/src/test/java/com/baeldung/reflection/ReflectionTest.java deleted file mode 100644 index 180ea38098..0000000000 --- a/reflection/src/test/java/com/baeldung/reflection/ReflectionTest.java +++ /dev/null @@ -1,323 +0,0 @@ -package com.baeldung.reflection; - -import org.junit.Test; - -import java.lang.reflect.*; -import java.util.Arrays; -import java.util.List; -import java.util.stream.Stream; - -import static java.util.stream.Collectors.toList; -import static org.junit.Assert.*; - -public class ReflectionTest { - - @Test - public void givenObject_whenGetsFieldNamesAtRuntime_thenCorrect() { - Object person = new Person(); - Field[] fields = person.getClass().getDeclaredFields(); - - List actualFieldNames = getFieldNames(fields); - - assertTrue(Arrays.asList("name", "age") - .containsAll(actualFieldNames)); - - } - - @Test - public void givenObject_whenGetsClassName_thenCorrect() { - Object goat = new Goat("goat"); - Class clazz = goat.getClass(); - - assertEquals("Goat", clazz.getSimpleName()); - assertEquals("com.baeldung.reflection.Goat", clazz.getName()); - assertEquals("com.baeldung.reflection.Goat", clazz.getCanonicalName()); - } - - @Test - public void givenClassName_whenCreatesObject_thenCorrect() - throws ClassNotFoundException { - Class clazz = Class.forName("com.baeldung.reflection.Goat"); - - assertEquals("Goat", clazz.getSimpleName()); - assertEquals("com.baeldung.reflection.Goat", clazz.getName()); - assertEquals("com.baeldung.reflection.Goat", clazz.getCanonicalName()); - } - - @Test - public void givenClass_whenRecognisesModifiers_thenCorrect() - throws ClassNotFoundException { - Class goatClass = Class.forName("com.baeldung.reflection.Goat"); - Class animalClass = Class.forName("com.baeldung.reflection.Animal"); - int goatMods = goatClass.getModifiers(); - int animalMods = animalClass.getModifiers(); - - assertTrue(Modifier.isPublic(goatMods)); - assertTrue(Modifier.isAbstract(animalMods)); - assertTrue(Modifier.isPublic(animalMods)); - } - - @Test - public void givenClass_whenGetsPackageInfo_thenCorrect() { - Goat goat = new Goat("goat"); - Class goatClass = goat.getClass(); - Package pkg = goatClass.getPackage(); - - assertEquals("com.baeldung.reflection", pkg.getName()); - } - - @Test - public void givenClass_whenGetsSuperClass_thenCorrect() { - Goat goat = new Goat("goat"); - String str = "any string"; - - Class goatClass = goat.getClass(); - Class goatSuperClass = goatClass.getSuperclass(); - - assertEquals("Animal", goatSuperClass.getSimpleName()); - assertEquals("Object", str.getClass().getSuperclass().getSimpleName()); - - } - - @Test - public void givenClass_whenGetsImplementedInterfaces_thenCorrect() - throws ClassNotFoundException { - Class goatClass = Class.forName("com.baeldung.reflection.Goat"); - Class animalClass = Class.forName("com.baeldung.reflection.Animal"); - Class[] goatInterfaces = goatClass.getInterfaces(); - Class[] animalInterfaces = animalClass.getInterfaces(); - - assertEquals(1, goatInterfaces.length); - assertEquals(1, animalInterfaces.length); - assertEquals("Locomotion", goatInterfaces[0].getSimpleName()); - assertEquals("Eating", animalInterfaces[0].getSimpleName()); - } - - @Test - public void givenClass_whenGetsConstructor_thenCorrect() - throws ClassNotFoundException { - Class goatClass = Class.forName("com.baeldung.reflection.Goat"); - Constructor[] constructors = goatClass.getConstructors(); - - assertEquals(1, constructors.length); - assertEquals("com.baeldung.reflection.Goat", constructors[0].getName()); - } - - @Test - public void givenClass_whenGetsFields_thenCorrect() - throws ClassNotFoundException { - Class animalClass = Class.forName("com.baeldung.reflection.Animal"); - Field[] fields = animalClass.getDeclaredFields(); - - List actualFields = getFieldNames(fields); - - assertEquals(2, actualFields.size()); - assertTrue(actualFields.containsAll(Arrays.asList("name", "CATEGORY"))); - } - - @Test - public void givenClass_whenGetsMethods_thenCorrect() - throws ClassNotFoundException { - Class animalClass = Class.forName("com.baeldung.reflection.Animal"); - Method[] methods = animalClass.getDeclaredMethods(); - List actualMethods = getMethodNames(methods); - - assertEquals(4, actualMethods.size()); - assertTrue(actualMethods.containsAll(Arrays.asList("getName", - "setName", "getSound", "makeSound"))); - } - - @Test - public void givenClass_whenGetsAllConstructors_thenCorrect() - throws ClassNotFoundException { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Constructor[] constructors = birdClass.getConstructors(); - - assertEquals(3, constructors.length); - } - - @Test - public void givenClass_whenGetsEachConstructorByParamTypes_thenCorrect() - throws Exception { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Constructor cons1 = birdClass.getConstructor(); - Constructor cons2 = birdClass.getConstructor(String.class); - Constructor cons3 = birdClass.getConstructor(String.class, - boolean.class); - } - - @Test - public void givenClass_whenInstantiatesObjectsAtRuntime_thenCorrect() - throws Exception { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - - Constructor cons1 = birdClass.getConstructor(); - Constructor cons2 = birdClass.getConstructor(String.class); - Constructor cons3 = birdClass.getConstructor(String.class, - boolean.class); - - Bird bird1 = (Bird) cons1.newInstance(); - Bird bird2 = (Bird) cons2.newInstance("Weaver bird"); - Bird bird3 = (Bird) cons3.newInstance("dove", true); - - assertEquals("bird", bird1.getName()); - assertEquals("Weaver bird", bird2.getName()); - assertEquals("dove", bird3.getName()); - assertFalse(bird1.walks()); - assertTrue(bird3.walks()); - } - - @Test - public void givenClass_whenGetsPublicFields_thenCorrect() - throws ClassNotFoundException { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Field[] fields = birdClass.getFields(); - assertEquals(1, fields.length); - assertEquals("CATEGORY", fields[0].getName()); - - } - - @Test - public void givenClass_whenGetsPublicFieldByName_thenCorrect() - throws Exception { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Field field = birdClass.getField("CATEGORY"); - assertEquals("CATEGORY", field.getName()); - - } - - @Test - public void givenClass_whenGetsDeclaredFields_thenCorrect() - throws ClassNotFoundException { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Field[] fields = birdClass.getDeclaredFields(); - assertEquals(1, fields.length); - assertEquals("walks", fields[0].getName()); - } - - @Test - public void givenClass_whenGetsFieldsByName_thenCorrect() - throws Exception { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Field field = birdClass.getDeclaredField("walks"); - assertEquals("walks", field.getName()); - - } - - @Test - public void givenClassField_whenGetsType_thenCorrect() - throws Exception { - Field field = Class.forName("com.baeldung.reflection.Bird") - .getDeclaredField("walks"); - Class fieldClass = field.getType(); - assertEquals("boolean", fieldClass.getSimpleName()); - } - - @Test - public void givenClassField_whenSetsAndGetsValue_thenCorrect() - throws Exception { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Bird bird = (Bird) birdClass.newInstance(); - Field field = birdClass.getDeclaredField("walks"); - field.setAccessible(true); - - assertFalse(field.getBoolean(bird)); - assertFalse(bird.walks()); - - field.set(bird, true); - - assertTrue(field.getBoolean(bird)); - assertTrue(bird.walks()); - - } - - @Test - public void givenClassField_whenGetsAndSetsWithNull_thenCorrect() - throws Exception { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Field field = birdClass.getField("CATEGORY"); - field.setAccessible(true); - - assertEquals("domestic", field.get(null)); - } - - @Test - public void givenClass_whenGetsAllPublicMethods_thenCorrect() - throws ClassNotFoundException { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Method[] methods = birdClass.getMethods(); - List methodNames = getMethodNames(methods); - - assertTrue(methodNames.containsAll(Arrays - .asList("equals", "notifyAll", "hashCode", - "walks", "eats", "toString"))); - - } - - @Test - public void givenClass_whenGetsOnlyDeclaredMethods_thenCorrect() - throws ClassNotFoundException { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - List actualMethodNames = getMethodNames(birdClass.getDeclaredMethods()); - - List expectedMethodNames = Arrays.asList("setWalks", "walks", "getSound", "eats"); - - assertEquals(expectedMethodNames.size(), actualMethodNames.size()); - assertTrue(expectedMethodNames.containsAll(actualMethodNames)); - assertTrue(actualMethodNames.containsAll(expectedMethodNames)); - - } - - @Test - public void givenMethodName_whenGetsMethod_thenCorrect() - throws Exception { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Method walksMethod = birdClass.getDeclaredMethod("walks"); - Method setWalksMethod = birdClass.getDeclaredMethod("setWalks", - boolean.class); - - assertFalse(walksMethod.isAccessible()); - assertFalse(setWalksMethod.isAccessible()); - - walksMethod.setAccessible(true); - setWalksMethod.setAccessible(true); - - assertTrue(walksMethod.isAccessible()); - assertTrue(setWalksMethod.isAccessible()); - - } - - @Test - public void givenMethod_whenInvokes_thenCorrect() - throws Exception { - Class birdClass = Class.forName("com.baeldung.reflection.Bird"); - Bird bird = (Bird) birdClass.newInstance(); - Method setWalksMethod = birdClass.getDeclaredMethod("setWalks", - boolean.class); - Method walksMethod = birdClass.getDeclaredMethod("walks"); - boolean walks = (boolean) walksMethod.invoke(bird); - - assertFalse(walks); - assertFalse(bird.walks()); - - setWalksMethod.invoke(bird, true); - boolean walks2 = (boolean) walksMethod.invoke(bird); - - assertTrue(walks2); - assertTrue(bird.walks()); - - } - - private static List getMethodNames(Method[] methods) { - return Stream.of(methods) - .map((Method::getName)) - .collect(toList()); - } - - private static List getFieldNames(Field[] fields) { - return Stream.of(fields) - .map(Field::getName) - .collect(toList()); - } - -}