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Refactor Reflection examples

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This commit is contained in:
Grzegorz Piwowarek 2016-09-04 08:18:17 +02:00
parent 89944e9a9f
commit 6bd09ce0ae
8 changed files with 342 additions and 330 deletions
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4
reflection/pom.xml
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@ -12,8 +12,8 @@
<artifactId>maven-compiler-plugin</artifactId> <artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version> <version>3.3</version>
<configuration> <configuration>
<source>7</source> <source>8</source>
<target>7</target> <target>8</target>
</configuration> </configuration>
</plugin> </plugin>
</plugins> </plugins>

34
reflection/src/main/java/com/baeldung/reflection/Animal.java
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@ -1,25 +1,27 @@
package com.baeldung.reflection; package com.baeldung.reflection;
public abstract class Animal implements Eating{ public abstract class Animal implements Eating {
public static final String CATEGORY = "domestic";
private String name;
public Animal(String name) { public static final String CATEGORY = "domestic";
this.name = name;
}
public String getName() { private String name;
return name;
}
public void setName(String name) { public Animal(String name) {
this.name = name; this.name = name;
} }
public String makeSound() { public String getName() {
return getSound(); return name;
} }
protected abstract String getSound(); public void setName(String name) {
this.name = name;
}
public String makeSound() {
return getSound();
}
protected abstract String getSound();
} }

53
reflection/src/main/java/com/baeldung/reflection/Bird.java
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@ -1,33 +1,36 @@
package com.baeldung.reflection; package com.baeldung.reflection;
public class Bird extends Animal { public class Bird extends Animal {
private boolean walks; 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 Bird() {
public String eats() { super("bird");
return "grains"; }
}
@Override public Bird(String name, boolean walks) {
protected String getSound() { super(name);
return "chaps"; setWalks(walks);
} }
public boolean walks() { public Bird(String name) {
return walks; super(name);
} }
public void setWalks(boolean walks) { @Override
this.walks = walks; public String eats() {
} return "grains";
}
@Override
protected String getSound() {
return "chaps";
}
public boolean walks() {
return walks;
}
public void setWalks(boolean walks) {
this.walks = walks;
}
} }

2
reflection/src/main/java/com/baeldung/reflection/Eating.java
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@ -1,5 +1,5 @@
package com.baeldung.reflection; package com.baeldung.reflection;
public interface Eating { public interface Eating {
String eats(); String eats();
} }

32
reflection/src/main/java/com/baeldung/reflection/Goat.java
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@ -1,24 +1,24 @@
package com.baeldung.reflection; package com.baeldung.reflection;
public class Goat extends Animal implements Locomotion{ public class Goat extends Animal implements Locomotion {
public Goat(String name) { public Goat(String name) {
super(name); super(name);
} }
@Override @Override
protected String getSound() { protected String getSound() {
return "bleat"; return "bleat";
} }
@Override @Override
public String getLocomotion() { public String getLocomotion() {
return "walks"; return "walks";
} }
@Override @Override
public String eats() { public String eats() {
return "grass"; return "grass";
} }
} }

2
reflection/src/main/java/com/baeldung/reflection/Locomotion.java
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@ -1,5 +1,5 @@
package com.baeldung.reflection; package com.baeldung.reflection;
public interface Locomotion { public interface Locomotion {
String getLocomotion(); String getLocomotion();
} }

4
reflection/src/main/java/com/baeldung/reflection/Person.java
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@ -1,6 +1,6 @@
package com.baeldung.reflection; package com.baeldung.reflection;
public class Person { public class Person {
private String name; private String name;
private int age; private int age;
} }

541
reflection/src/test/java/com/baeldung/reflection/ReflectionTest.java
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@ -1,316 +1,323 @@
package com.baeldung.reflection; package com.baeldung.reflection;
import static org.junit.Assert.*;
import java.lang.reflect.*;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import org.junit.Test; 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 { public class ReflectionTest {
@Test
public void givenObject_whenGetsFieldNamesAtRuntime_thenCorrect() {
Object person = new Person();
Field[] fields = person.getClass().getDeclaredFields();
List<String> expectedFieldNames = Arrays.asList(new String[] { "name",
"age" });
List<String> actualFieldNames = new ArrayList<>(); @Test
for (Field field : fields) public void givenObject_whenGetsFieldNamesAtRuntime_thenCorrect() {
actualFieldNames.add(field.getName()); Object person = new Person();
Field[] fields = person.getClass().getDeclaredFields();
assertTrue(expectedFieldNames.containsAll(actualFieldNames)); List<String> 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 @Test
public void givenClassName_whenCreatesObject_thenCorrect() public void givenObject_whenGetsClassName_thenCorrect() {
throws ClassNotFoundException { Object goat = new Goat("goat");
Class<?> clazz = Class.forName("com.baeldung.reflection.Goat"); Class<?> clazz = goat.getClass();
assertEquals("Goat", clazz.getSimpleName());
assertEquals("com.baeldung.reflection.Goat", clazz.getName());
assertEquals("com.baeldung.reflection.Goat", clazz.getCanonicalName());
}
@Test assertEquals("Goat", clazz.getSimpleName());
public void givenClass_whenRecognisesModifiers_thenCorrect() assertEquals("com.baeldung.reflection.Goat", clazz.getName());
throws ClassNotFoundException { assertEquals("com.baeldung.reflection.Goat", clazz.getCanonicalName());
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 @Test
public void givenClass_whenGetsPackageInfo_thenCorrect() { public void givenClassName_whenCreatesObject_thenCorrect()
Goat goat = new Goat("goat"); throws ClassNotFoundException {
Class<?> goatClass = goat.getClass(); Class<?> clazz = Class.forName("com.baeldung.reflection.Goat");
Package pkg = goatClass.getPackage();
assertEquals("com.baeldung.reflection", pkg.getName());
}
@Test assertEquals("Goat", clazz.getSimpleName());
public void givenClass_whenGetsSuperClass_thenCorrect() { assertEquals("com.baeldung.reflection.Goat", clazz.getName());
Goat goat = new Goat("goat"); assertEquals("com.baeldung.reflection.Goat", clazz.getCanonicalName());
String str = "any string"; }
Class<?> goatClass = goat.getClass(); @Test
Class<?> goatSuperClass = goatClass.getSuperclass(); 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();
assertEquals("Animal", goatSuperClass.getSimpleName()); assertTrue(Modifier.isPublic(goatMods));
assertEquals("Object", str.getClass().getSuperclass().getSimpleName()); 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();
@Test assertEquals("com.baeldung.reflection", pkg.getName());
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 @Test
public void givenClass_whenGetsConstructor_thenCorrect() public void givenClass_whenGetsSuperClass_thenCorrect() {
throws ClassNotFoundException { Goat goat = new Goat("goat");
Class<?> goatClass = Class.forName("com.baeldung.reflection.Goat"); String str = "any string";
Constructor<?>[] constructors = goatClass.getConstructors();
assertEquals(1, constructors.length);
assertEquals("com.baeldung.reflection.Goat", constructors[0].getName());
}
@Test Class<?> goatClass = goat.getClass();
public void givenClass_whenGetsFields_thenCorrect() Class<?> goatSuperClass = goatClass.getSuperclass();
throws ClassNotFoundException {
Class<?> animalClass = Class.forName("com.baeldung.reflection.Animal");
Field[] fields = animalClass.getDeclaredFields();
List<String> expectedFields = Arrays.asList(new String[] { "name",
"CATEGORY" });
List<String> actualFields = new ArrayList<>();
for (Field field : fields)
actualFields.add(field.getName());
assertEquals(2, actualFields.size());
assertTrue(actualFields.containsAll(expectedFields));
}
@Test assertEquals("Animal", goatSuperClass.getSimpleName());
public void givenClass_whenGetsMethods_thenCorrect() assertEquals("Object", str.getClass().getSuperclass().getSimpleName());
throws ClassNotFoundException {
Class<?> animalClass = Class.forName("com.baeldung.reflection.Animal");
Method[] methods = animalClass.getDeclaredMethods();
List<String> expectedMethods = Arrays.asList(new String[] { "getName",
"setName", "getSound", "makeSound" });
List<String> actualMethods = new ArrayList<>();
for (Method method : methods)
actualMethods.add(method.getName());
assertEquals(4, actualMethods.size());
assertTrue(actualMethods.containsAll(expectedMethods));
} }
@Test @Test
public void givenClass_whenGetsAllConstructors_thenCorrect() public void givenClass_whenGetsImplementedInterfaces_thenCorrect()
throws ClassNotFoundException { throws ClassNotFoundException {
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird"); Class<?> goatClass = Class.forName("com.baeldung.reflection.Goat");
Constructor<?>[] constructors = birdClass.getConstructors(); Class<?> animalClass = Class.forName("com.baeldung.reflection.Animal");
assertEquals(3, constructors.length); Class<?>[] goatInterfaces = goatClass.getInterfaces();
} Class<?>[] animalInterfaces = animalClass.getInterfaces();
@Test assertEquals(1, goatInterfaces.length);
public void givenClass_whenGetsEachConstructorByParamTypes_thenCorrect() assertEquals(1, animalInterfaces.length);
throws ClassNotFoundException, NoSuchMethodException, assertEquals("Locomotion", goatInterfaces[0].getSimpleName());
SecurityException { assertEquals("Eating", animalInterfaces[0].getSimpleName());
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 @Test
public void givenClass_whenInstantiatesObjectsAtRuntime_thenCorrect() public void givenClass_whenGetsConstructor_thenCorrect()
throws ClassNotFoundException, NoSuchMethodException, throws ClassNotFoundException {
SecurityException, InstantiationException, IllegalAccessException, Class<?> goatClass = Class.forName("com.baeldung.reflection.Goat");
IllegalArgumentException, InvocationTargetException { Constructor<?>[] constructors = goatClass.getConstructors();
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 assertEquals(1, constructors.length);
public void givenClass_whenGetsPublicFields_thenCorrect() assertEquals("com.baeldung.reflection.Goat", constructors[0].getName());
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_whenGetsFields_thenCorrect()
throws ClassNotFoundException {
Class<?> animalClass = Class.forName("com.baeldung.reflection.Animal");
Field[] fields = animalClass.getDeclaredFields();
@Test List<String> actualFields = getFieldNames(fields);
public void givenClass_whenGetsPublicFieldByName_thenCorrect()
throws ClassNotFoundException, NoSuchFieldException,
SecurityException {
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
Field field = birdClass.getField("CATEGORY");
assertEquals("CATEGORY", field.getName());
} assertEquals(2, actualFields.size());
assertTrue(actualFields.containsAll(Arrays.asList("name", "CATEGORY")));
}
@Test @Test
public void givenClass_whenGetsDeclaredFields_thenCorrect() public void givenClass_whenGetsMethods_thenCorrect()
throws ClassNotFoundException { throws ClassNotFoundException {
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird"); Class<?> animalClass = Class.forName("com.baeldung.reflection.Animal");
Field[] fields = birdClass.getDeclaredFields(); Method[] methods = animalClass.getDeclaredMethods();
assertEquals(1, fields.length); List<String> actualMethods = getMethodNames(methods);
assertEquals("walks", fields[0].getName());
}
@Test assertEquals(4, actualMethods.size());
public void givenClass_whenGetsFieldsByName_thenCorrect() assertTrue(actualMethods.containsAll(Arrays.asList("getName",
throws ClassNotFoundException, NoSuchFieldException, "setName", "getSound", "makeSound")));
SecurityException { }
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
Field field = birdClass.getDeclaredField("walks");
assertEquals("walks", field.getName());
} @Test
public void givenClass_whenGetsAllConstructors_thenCorrect()
throws ClassNotFoundException {
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
Constructor<?>[] constructors = birdClass.getConstructors();
@Test assertEquals(3, constructors.length);
public void givenClassField_whenGetsType_thenCorrect() }
throws ClassNotFoundException, NoSuchFieldException,
SecurityException {
Field field = Class.forName("com.baeldung.reflection.Bird")
.getDeclaredField("walks");
Class<?> fieldClass = field.getType();
assertEquals("boolean", fieldClass.getSimpleName());
}
@Test @Test
public void givenClassField_whenSetsAndGetsValue_thenCorrect() public void givenClass_whenGetsEachConstructorByParamTypes_thenCorrect()
throws ClassNotFoundException, NoSuchFieldException, throws Exception {
SecurityException, InstantiationException, IllegalAccessException { Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird"); Constructor<?> cons1 = birdClass.getConstructor();
Bird bird = (Bird) birdClass.newInstance(); Constructor<?> cons2 = birdClass.getConstructor(String.class);
Field field = birdClass.getDeclaredField("walks"); Constructor<?> cons3 = birdClass.getConstructor(String.class,
field.setAccessible(true); boolean.class);
}
assertFalse(field.getBoolean(bird)); @Test
assertFalse(bird.walks()); public void givenClass_whenInstantiatesObjectsAtRuntime_thenCorrect()
throws Exception {
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
field.set(bird, true); Constructor<?> cons1 = birdClass.getConstructor();
Constructor<?> cons2 = birdClass.getConstructor(String.class);
Constructor<?> cons3 = birdClass.getConstructor(String.class,
boolean.class);
assertTrue(field.getBoolean(bird)); Bird bird1 = (Bird) cons1.newInstance();
assertTrue(bird.walks()); 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 @Test
public void givenClassField_whenGetsAndSetsWithNull_thenCorrect() public void givenClass_whenGetsPublicFields_thenCorrect()
throws ClassNotFoundException, InstantiationException, throws ClassNotFoundException {
IllegalAccessException, NoSuchFieldException, SecurityException { Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird"); Field[] fields = birdClass.getFields();
Field field = birdClass.getField("CATEGORY"); assertEquals(1, fields.length);
field.setAccessible(true); assertEquals("CATEGORY", fields[0].getName());
assertEquals("domestic", field.get(null)); }
}
@Test @Test
public void givenClass_whenGetsAllPublicMethods_thenCorrect() public void givenClass_whenGetsPublicFieldByName_thenCorrect()
throws ClassNotFoundException { throws Exception {
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird"); Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
Method[] methods = birdClass.getMethods(); Field field = birdClass.getField("CATEGORY");
List<String> methodNames = new ArrayList<>(); assertEquals("CATEGORY", field.getName());
for (Method method : methods)
methodNames.add(method.getName());
assertTrue(methodNames.containsAll(Arrays
.asList(new String[] { "equals", "notifyAll", "hashCode",
"walks", "eats", "toString" })));
} }
@Test @Test
public void givenClass_whenGetsOnlyDeclaredMethods_thenCorrect() public void givenClass_whenGetsDeclaredFields_thenCorrect()
throws ClassNotFoundException { throws ClassNotFoundException {
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird"); Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
Method[] methods = birdClass.getDeclaredMethods(); Field[] fields = birdClass.getDeclaredFields();
List<String> expectedMethodNames = Arrays.asList(new String[] { assertEquals(1, fields.length);
"setWalks", "walks", "getSound", "eats" }); assertEquals("walks", fields[0].getName());
List<String> actualMethodNames = new ArrayList<>(); }
for (Method method : methods)
actualMethodNames.add(method.getName());
assertEquals(expectedMethodNames.size(), actualMethodNames.size());
assertTrue(expectedMethodNames.containsAll(actualMethodNames));
assertTrue(actualMethodNames.containsAll(expectedMethodNames));
} @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 givenMethodName_whenGetsMethod_thenCorrect()
throws ClassNotFoundException, NoSuchMethodException,
SecurityException {
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 givenClassField_whenGetsType_thenCorrect()
throws Exception {
Field field = Class.forName("com.baeldung.reflection.Bird")
.getDeclaredField("walks");
Class<?> fieldClass = field.getType();
assertEquals("boolean", fieldClass.getSimpleName());
}
@Test @Test
public void givenMethod_whenInvokes_thenCorrect() public void givenClassField_whenSetsAndGetsValue_thenCorrect()
throws ClassNotFoundException, NoSuchMethodException, throws Exception {
SecurityException, IllegalAccessException, Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird");
IllegalArgumentException, InvocationTargetException, Bird bird = (Bird) birdClass.newInstance();
InstantiationException { Field field = birdClass.getDeclaredField("walks");
Class<?> birdClass = Class.forName("com.baeldung.reflection.Bird"); field.setAccessible(true);
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());
} 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<String> 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<String> actualMethodNames = getMethodNames(birdClass.getDeclaredMethods());
List<String> 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<String> getMethodNames(Method[] methods) {
return Stream.of(methods)
.map((Method::getName))
.collect(toList());
}
private static List<String> getFieldNames(Field[] fields) {
return Stream.of(fields)
.map(Field::getName)
.collect(toList());
}
} }