[BAEL-2506] Moved Java Void Type examples into a new core-java-reflection module
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dupirefr
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-reflection</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-reflection</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-java</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-java</relativePath>
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</parent>
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<dependencies>
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<dependency>
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<groupId>org.assertj</groupId>
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<artifactId>assertj-core</artifactId>
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<version>${assertj-core.version}</version>
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</dependency>
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</dependencies>
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<properties>
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<assertj-core.version>3.10.0</assertj-core.version>
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</properties>
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</project>
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package com.baeldung.reflection.voidtype;
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public interface Action {
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void execute();
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}
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package com.baeldung.reflection.voidtype;
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public class Calculator {
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private int result = 0;
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public int add(int number) {
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return result += number;
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}
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public int sub(int number) {
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return result -= number;
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}
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public void clear() {
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result = 0;
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}
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public void print() {
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System.out.println(result);
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}
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}
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package com.baeldung.reflection.voidtype;
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import java.util.concurrent.Callable;
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import java.util.function.Consumer;
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import java.util.function.Function;
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public class Defer {
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public static <V> V defer(Callable<V> callable) throws Exception {
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return callable.call();
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}
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public static void defer(Runnable runnable) {
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runnable.run();
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}
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public static <T, R> R defer(Function<T, R> function, T arg) {
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return function.apply(arg);
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}
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public static <T> void defer(Consumer<T> consumer, T arg) {
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consumer.accept(arg);
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}
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public static void defer(Action action) {
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action.execute();
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}
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}
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package com.baeldung.reflection.voidtype;
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import java.util.concurrent.Callable;
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public class MyOwnDefer {
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public static void defer(Runnable runnable) throws Exception {
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Defer.defer(new Callable<Void>() {
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@Override
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public Void call() {
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runnable.run();
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return null;
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}
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});
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}
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}
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package com.baeldung.reflection.voidtype;
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import org.junit.jupiter.api.Test;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.List;
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import java.util.stream.Collectors;
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import static org.assertj.core.api.Assertions.assertThat;
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class CalculatorUnitTest {
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@Test
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void givenCalculator_whenGettingVoidMethodsByReflection_thenOnlyClearAndPrint() {
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Method[] calculatorMethods = Calculator.class.getDeclaredMethods();
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List<Method> calculatorVoidMethods = Arrays.stream(calculatorMethods)
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.filter(method -> method.getReturnType().equals(Void.TYPE))
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.collect(Collectors.toList());
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assertThat(calculatorVoidMethods)
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.allMatch(method -> Arrays.asList("clear", "print").contains(method.getName()));
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}
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}
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package com.baeldung.reflection.voidtype;
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import org.junit.jupiter.api.Test;
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import java.util.concurrent.Callable;
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import java.util.concurrent.atomic.AtomicBoolean;
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import java.util.function.Consumer;
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import java.util.function.Function;
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import static org.assertj.core.api.Assertions.assertThat;
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import static org.junit.jupiter.api.Assertions.*;
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class DeferUnitTest {
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@Test
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void givenVoidCallable_whenDiffer_thenReturnNull() throws Exception {
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Callable<Void> callable = new Callable<Void>() {
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@Override
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public Void call() {
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System.out.println("Hello!");
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return null;
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}
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};
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assertThat(Defer.defer(callable)).isNull();
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}
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@Test
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void givenVoidRunnable_whenDiffer_thenNoReturn() {
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AtomicBoolean run = new AtomicBoolean(false);
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Runnable runnable = new Runnable() {
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@Override
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public void run() {
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System.out.println("Hello!");
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run.set(true);
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}
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};
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Defer.defer(runnable);
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assertTrue(run.get());
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}
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@Test
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void givenVoidFunction_whenDiffer_thenReturnNull() {
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Function<String, Void> function = s -> {
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System.out.println("Hello " + s + "!");
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return null;
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};
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assertThat(Defer.defer(function, "World")).isNull();
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}
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@Test
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void givenVoidConsumer_whenDiffer_thenReturnNull() {
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AtomicBoolean run = new AtomicBoolean(false);
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Consumer<String> function = s -> {
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System.out.println("Hello " + s + "!");
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run.set(true);
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};
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Defer.defer(function, "World");
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assertTrue(run.get());
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}
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@Test
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void givenAction_whenDiffer_thenNoReturn() {
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AtomicBoolean run = new AtomicBoolean(false);
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Action action = () -> {
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System.out.println("Hello!");
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run.set(true);
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};
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Defer.defer(action);
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assertTrue(run.get());
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}
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}
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package com.baeldung.reflection.voidtype;
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import org.junit.jupiter.api.Test;
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import java.util.concurrent.atomic.AtomicBoolean;
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import static org.junit.jupiter.api.Assertions.*;
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class MyOwnDeferUnitTest {
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@Test
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void defer() throws Exception {
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AtomicBoolean run = new AtomicBoolean(false);
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Runnable runnable = () -> {
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System.out.println("Hello!");
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run.set(true);
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};
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MyOwnDefer.defer(runnable);
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assertTrue(run.get());
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}
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}
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