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Merge pull request #76 from sayed-moin-ahmed/develop
Develop
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‎example.iml

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<orderEntry type="library" name="Maven: org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.4.10" level="project" />
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<orderEntry type="library" scope="TEST" name="Maven: org.jetbrains.kotlin:kotlin-test:1.4.10" level="project" />
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<orderEntry type="library" scope="TEST" name="Maven: org.jetbrains.kotlin:kotlin-test-common:1.4.10" level="project" />
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<orderEntry type="library" name="Maven: org.testng:testng:7.4.0" level="project" />
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<orderEntry type="library" name="Maven: com.beust:jcommander:1.78" level="project" />
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<orderEntry type="library" name="Maven: org.webjars:jquery:3.5.1" level="project" />
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</component>
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</module>

‎src/main/java/com/java15/example/java8inaction/Java8_9_10_11_whatshappening/Apple.java renamed to ‎src/main/java/com/java15/example/java8inaction/Apple.java

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package com.java15.example.java8inaction.Java8_9_10_11_whatshappening;
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package com.java15.example.java8inaction;
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public class Apple {
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‎src/main/java/com/java15/example/java8inaction/Java8_9_10_11_whatshappening/Colors.java renamed to ‎src/main/java/com/java15/example/java8inaction/Colors.java

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package com.java15.example.java8inaction.Java8_9_10_11_whatshappening;
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package com.java15.example.java8inaction;
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public interface Colors {
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String GREEN ="GREEN";

‎src/main/java/com/java15/example/java8inaction/Data.java

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package com.java15.example.java8inaction;
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import java.util.ArrayList;
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import java.util.Comparator;
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import java.util.List;
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public class Data {
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public static List<Apple> getData() {
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Apple apple1 = new Apple(10, Colors.GREEN);
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Apple apple2 = new Apple(1,Colors.RED);
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Apple apple3 = new Apple(5,Colors.GREEN);
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Apple apple4 = new Apple(3,Colors.RED);
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Apple apple5 = new Apple(3,Colors.RED);
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Apple apple6 = new Apple(5,Colors.GREEN);
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List<Apple> apples = List.of(apple1,apple2,apple3,apple4,apple5,apple6);
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return apples;
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}
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public static List<Apple> getData1() {
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Apple apple1 = new Apple(10,Colors.GREEN);
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Apple apple2 = new Apple(1,Colors.RED);
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Apple apple3 = new Apple(5,Colors.GREEN);
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Apple apple4 = new Apple(3,Colors.RED);
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Apple apple5 = new Apple(3,Colors.RED);
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Apple apple6 = new Apple(5,Colors.GREEN);
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List<Apple> apples = new ArrayList<>();
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apples.add(apple1);
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apples.add(apple2);
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apples.add(apple3);
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apples.add(apple4);
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apples.add(apple5);
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apples.add(apple6);
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apples.sort(Comparator.comparing(Apple::getWeight));
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return apples;
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}
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}

‎src/main/java/com/java15/example/java8inaction/Java8_9_10_11_whatshappening/Test.java

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package com.java15.example.java8inaction.Java8_9_10_11_whatshappening;
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import com.java15.example.java8inaction.Apple;
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import com.java15.example.java8inaction.Colors;
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import com.java15.example.java8inaction.Data;
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import java.io.File;
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import java.util.Comparator;
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import java.util.List;
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import java.util.Map;
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import java.util.Optional;
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import java.util.*;
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import java.util.function.Predicate;
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import java.util.stream.Collectors;
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public class Test {
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public static void main(String[] args) {
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List<Apple> apples = getData();
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//filterApples(apples,(Apple a) -> Colors.GREEN.equals(a.getColor())).stream().forEach(System.out::println);
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List<Apple> apples = Data.getData();
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//filterApples(apples,(Apple a) -> Colors.GREEN.equals(a.getColor())).stream().forEach(System.out::println);
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//filterGroupApples(apples,(Apple a) -> Colors.RED.equals(a.getColor())).forEach((i,list) ->{System.out.println(i+""+list);});
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//filterGroupApples(apples,(Apple a) -> {return true;}).forEach((i,list) ->{System.out.println(i+""+list);});
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minAppleByWeight(apples).ifPresent(System.out::println);
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maxAppleByWeight(apples).ifPresent(System.out::println);
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// filterApples(apples,(Apple a) -> Colors.GREEN.equals(a.getColor())).stream().forEach(System.out::println);
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// filterGroupApples(apples,(Apple a) -> Colors.RED.equals(a.getColor())).forEach((i,list) ->{System.out.println(i+""+list);});
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// filterGroupApples(apples,(Apple a) -> {return true;}).forEach((i,list) ->{System.out.println(i+""+list);});
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// minAppleByWeight(apples).ifPresent(System.out::println);
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// maxAppleByWeight(apples).ifPresent(System.out::println);
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// getData1().forEach(System.out::println);
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}
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static List<Apple> filterApples(List<Apple> inventory, Predicate<Apple> p) {
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return inventory.stream().max(Comparator.comparing(Apple::getWeight));
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}
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private static List<Apple> getData() {
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Apple apple1 = new Apple(10,Colors.GREEN);
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Apple apple2 = new Apple(1,Colors.RED);
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Apple apple3 = new Apple(5,Colors.GREEN);
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Apple apple4 = new Apple(3,Colors.RED);
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Apple apple5 = new Apple(3,Colors.RED);
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Apple apple6 = new Apple(5,Colors.GREEN);
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List<Apple> apples = List.of(apple1,apple2,apple3,apple4,apple5,apple6);
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return apples;
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}
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static File[] handlingFiles(){
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File[] hiddenFiles = new File(".").listFiles(File::isHidden);
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return hiddenFiles;
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}
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}
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‎src/main/java/com/java15/example/java8inaction/passingcodewithbehaviorparameterization/Test.java

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package com.java15.example.java8inaction.passingcodewithbehaviorparameterization;
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import com.java15.example.java8inaction.Apple;
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import com.java15.example.java8inaction.Colors;
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import com.java15.example.java8inaction.Data;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.*;
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import java.util.function.Function;
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import java.util.function.Predicate;
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import java.util.stream.Collectors;
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import static java.util.stream.Collectors.groupingBy;
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public class Test {
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public static void main(String[] args) throws ExecutionException, InterruptedException {
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List<Apple> apples = Data.getData();
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// beforeJava8(apples);
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//filter(apples,(Apple e) -> Colors.GREEN.equals(e.getColor())).forEach(System.out::println);
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// groupBy(apples,apple -> apple.getWeight()).forEach((i, list)->System.out.println(i+""+list));
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executorService(()->{ int i=0; while(i<10){ i++;} return i;});
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}
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private static <V> void executorService(Callable<V> task) throws InterruptedException, ExecutionException {
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ExecutorService executorService = Executors.newCachedThreadPool();
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Future<V> threadName = executorService.submit(task);
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System.out.println(threadName.get());
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executorService.shutdown();
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}
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//More Generic
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static public<T> List<T> filter(List<T> list,Predicate<T> predicate){
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return list.stream().filter(predicate).collect(Collectors.toList());
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}
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static public <T,K> Map<? extends K, List<T>> groupBy(List<T> list, Function<? super T, ? extends K> classifier){
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return list.stream().collect(groupingBy(classifier));
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}
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private static void beforeJava8(List<Apple> apples) {
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final List<Apple> filteredApple = new ArrayList<>();
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apples.forEach(e->
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{
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if(new CustomPredicateImpl().test(e))
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filteredApple.add(e);
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});
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filteredApple.forEach(System.out::println);
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}
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}
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interface CustomPredicate<T>{
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boolean test(T t);
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}
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class CustomPredicateImpl implements CustomPredicate{
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@Override
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public boolean test(Object o) {
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if(Colors.GREEN.equals(((Apple)o).getColor()))
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return true;
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return false;
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}
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}

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