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mariofuscomariofusco
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mavenize project
1 parent 6cc5c3b commit b58c4c9

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+175
-1
lines changed

‎.gitignore

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/target
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/local
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# Eclipse, Netbeans and IntelliJ files
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/.*
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!.gitignore
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/nbproject
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/*.ipr
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/*.iws
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/*.iml
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# Repository wide ignore mac DS_Store files
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.DS_Store

‎pom.xml

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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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<groupId>manning</groupId>
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<artifactId>lambdasinaction</artifactId>
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<version>1.0</version>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.8.1</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎chap1/FilteringApples.java ‎src/main/java/lambdasinaction/chap1/FilteringApples.java

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package lambdasinaction.chap1;
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import java.util.*;
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import java.util.function.Predicate;
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public class FilteringApples{
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public static void main(String ... args){

‎chap2/FilteringApples.java ‎src/main/java/lambdasinaction/chap2/FilteringApples.java

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package lambdasinaction.chap2;
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import java.util.*;
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public class FilteringApples{
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public static void main(String ... args){

‎chap2/MeaningOfThis.java ‎src/main/java/lambdasinaction/chap2/MeaningOfThis.java

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package lambdasinaction.chap2;
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public class MeaningOfThis
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{
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public final int value = 4;

‎chap3/ExecuteAround.java ‎src/main/java/lambdasinaction/chap3/ExecuteAround.java

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package lambdasinaction.chap3;
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import java.io.*;
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public class ExecuteAround {
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}
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public static String processFile(BufferedReaderProcessor p) throws IOException {
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try(BufferedReader br = new BufferedReader(new FileReader("data.txt"))){
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try(BufferedReader br = new BufferedReader(new FileReader("src/main/java/lambdasinaction/chap3/data.txt"))){
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return p.process(br);
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}
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‎chap3/Lambdas.java ‎src/main/java/lambdasinaction/chap3/Lambdas.java

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package lambdasinaction.chap3;
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import java.util.*;
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public class Lambdas {
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public static void main(String ...args){
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‎chap3/Sorting.java ‎src/main/java/lambdasinaction/chap3/Sorting.java

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package lambdasinaction.chap3;
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import java.util.*;
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import static java.util.Comparator.comparing;
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public class Sorting {
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public static void main(String...args){

‎chap3/data.txt ‎src/main/java/lambdasinaction/chap3/data.txt

File renamed without changes.

‎src/main/java/lambdasinaction/chap5/Dish.java

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package lambdasinaction.chap5;
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public class Dish {
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private final String name;
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private final boolean vegetarian;
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private final int calories;
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private final Type type;
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public Dish(String name, boolean vegetarian, int calories, Type type) {
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this.name = name;
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this.vegetarian = vegetarian;
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this.calories = calories;
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this.type = type;
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}
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public String getName() {
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return name;
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}
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public boolean isVegetarian() {
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return vegetarian;
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}
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public int getCalories() {
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return calories;
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}
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public Type getType() {
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return type;
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}
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public enum Type { MEAT, FISH, OTHER }
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@Override
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public String toString() {
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return name;
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}
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}

‎src/main/java/lambdasinaction/chap5/GroupingTransactions.java

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package lambdasinaction.chap5;
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import java.util.*;
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import static java.util.stream.Collectors.groupingBy;
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public class GroupingTransactions {
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public static List<Transaction> transactions = Arrays.asList( new Transaction(Currency.EUR, 1500.0),
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new Transaction(Currency.USD, 2300.0),
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new Transaction(Currency.GBP, 9900.0),
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new Transaction(Currency.EUR, 1100.0),
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new Transaction(Currency.JPY, 7800.0),
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new Transaction(Currency.CHF, 6700.0),
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new Transaction(Currency.EUR, 5600.0),
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new Transaction(Currency.USD, 4500.0),
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new Transaction(Currency.CHF, 3400.0),
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new Transaction(Currency.GBP, 3200.0),
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new Transaction(Currency.USD, 4600.0),
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new Transaction(Currency.JPY, 5700.0),
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new Transaction(Currency.EUR, 6800.0) );
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public static void main(String ... args) {
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groupImperatively();
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groupFunctionally();
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}
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private static void groupImperatively() {
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Map<Currency, List<Transaction>> transactionsByCurrencies = new HashMap<>();
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for (Transaction transaction : transactions) {
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Currency currency = transaction.getCurrency();
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List<Transaction> transactionsForCurrency = transactionsByCurrencies.get(currency);
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if (transactionsForCurrency == null) {
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transactionsForCurrency = new ArrayList<>();
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transactionsByCurrencies.put(currency, transactionsForCurrency);
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}
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transactionsForCurrency.add(transaction);
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}
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System.out.println(transactionsByCurrencies);
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}
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private static void groupFunctionally() {
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Map<Currency, List<Transaction>> transactionsByCurrencies = transactions.stream().collect(groupingBy(Transaction::getCurrency));
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System.out.println(transactionsByCurrencies);
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}
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public static class Transaction {
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private final Currency currency;
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private final double value;
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public Transaction(Currency currency, double value) {
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this.currency = currency;
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this.value = value;
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}
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public Currency getCurrency() {
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return currency;
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}
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public double getValue() {
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return value;
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}
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@Override
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public String toString() {
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return currency + " " + value;
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}
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}
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public enum Currency {
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EUR, USD, JPY, GBP, CHF
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}
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}

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