jfitoussi · islembagga · Mar 27, 2017
diff --git a/.project b/.project
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>java8-lambda-stream-insta</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>
diff --git a/collection-interfaces/.classpath b/collection-interfaces/.classpath
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>
diff --git a/collection-interfaces/.project b/collection-interfaces/.project
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>collection-interfaces</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>
diff --git a/collection-interfaces/.settings/org.eclipse.jdt.core.prefs b/collection-interfaces/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,5 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.8
diff --git a/collection-interfaces/bin/.project b/collection-interfaces/bin/.project
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>collection-interfaces</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>
diff --git a/collection-interfaces/bin/pom.xml b/collection-interfaces/bin/pom.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java8-lambda-stream-insta</artifactId>
+        <groupId>java8-lambda-stream-insta</groupId>
+        <version>2.1</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>collection-interfaces</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>java8-lambda-stream-insta</groupId>
+            <artifactId>common-test-tool</artifactId>
+        </dependency>
+    </dependencies>
+</project>
diff --git a/collection-interfaces/bin/src/test/java/collection/interfaces/Exercise1Test.class b/collection-interfaces/bin/src/test/java/collection/interfaces/Exercise1Test.class
diff --git a/collection-interfaces/bin/src/test/java/collection/interfaces/Exercise2Test.class b/collection-interfaces/bin/src/test/java/collection/interfaces/Exercise2Test.class
diff --git a/common-test-tool/.classpath b/common-test-tool/.classpath
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry excluding="**" kind="src" output="target/test-classes" path="src/test/resources">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>
diff --git a/common-test-tool/.project b/common-test-tool/.project
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>common-test-tool</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>
diff --git a/common-test-tool/.settings/org.eclipse.jdt.core.prefs b/common-test-tool/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,5 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.8
diff --git a/playground/.classpath b/playground/.classpath
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>
diff --git a/playground/.project b/playground/.project
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>playground</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>
diff --git a/playground/.settings/org.eclipse.jdt.core.prefs b/playground/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,5 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.8
diff --git a/stream-api/.classpath b/stream-api/.classpath
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="src" output="target/classes" path="src/main/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
+		<attributes>
+			<attribute name="optional" value="true"/>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
+		<attributes>
+			<attribute name="maven.pomderived" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="target/classes"/>
+</classpath>
diff --git a/stream-api/.project b/stream-api/.project
@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>stream-api</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.m2e.core.maven2Builder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+		<nature>org.eclipse.m2e.core.maven2Nature</nature>
+	</natures>
+</projectDescription>
diff --git a/stream-api/.settings/org.eclipse.jdt.core.prefs b/stream-api/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,5 @@
+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=1.8
+org.eclipse.jdt.core.compiler.compliance=1.8
+org.eclipse.jdt.core.compiler.problem.forbiddenReference=warning
+org.eclipse.jdt.core.compiler.source=1.8
diff --git a/stream-api/src/test/java/stream/api/Exercise1Test.java b/stream-api/src/test/java/stream/api/Exercise1Test.java
@@ -27,7 +27,7 @@ public void findRichCustomers() {
          * Create a {@link Stream} from customerList only including customer who has more budget than 10000.
          * Use lambda expression for Predicate and {@link Stream#filter} for filtering.
          */
-        Predicate<Customer> richCustomerCondition = null;
+        Predicate<Customer> richCustomerCondition = customer -> customer.getBudget()>10000;
         Stream<Customer> richCustomerStream = null;
 
         assertTrue("Solution for Predicate should be lambda expression", AssertUtil.isLambda(richCustomerCondition));

diff --git a/stream-api/src/test/java/stream/api/Exercise2Test.java b/stream-api/src/test/java/stream/api/Exercise2Test.java
@@ -27,7 +27,7 @@ public void sortByAge() {
          * Create a stream with ascending ordered age values.
          * Use {@link Stream#sorted} to sort them.
          */
-        Stream<Integer> sortedAgeStream = null;
+        Stream<Integer> sortedAgeStream = customerList.stream().map(Customer::getAge).sorted();
 
         List<Integer> sortedAgeList = sortedAgeStream.collect(Collectors.toList());
         assertThat(sortedAgeList, contains(21, 22, 22, 26, 27, 28, 32, 35, 36, 38));
@@ -40,8 +40,8 @@ public void descSortByAge() {
         /**
          * Create a stream with descending ordered age values.
          */
-        Comparator<Integer> descOrder = null;
-        Stream<Integer> sortedAgeStream = null;
+        Comparator<Integer> descOrder = (custom1, custom2)-> custom2 - custom1;
+        Stream<Integer> sortedAgeStream = customerList.stream().map(Customer::getAge).sorted(descOrder);
 
         assertTrue(AssertUtil.isLambda(descOrder));
         List<Integer> sortedAgeList = sortedAgeStream.collect(Collectors.toList());
@@ -55,7 +55,7 @@ public void top3RichCustomer() {
         /**
          * Create a stream with top 3 rich customers using {@link Stream#limit} to limit the size of the stream
          */
-        Stream<String> top3RichCustomerStream = null;
+        Stream<String> top3RichCustomerStream = customerList.stream().sorted((customer1, customer2) -> customer2.getBudget()-customer1.getBudget()).limit(3).map(Customer::getName);
 
         List<String> top3RichCustomerList = top3RichCustomerStream.collect(Collectors.toList());
         assertThat(top3RichCustomerList, contains("Diana", "Andrew", "Chris"));
@@ -68,7 +68,7 @@ public void distinctAge() {
         /**
          * Create a stream with distinct age values using {@link Stream#distinct}
          */
-        Stream<Integer> distinctAgeStream = null;
+        Stream<Integer> distinctAgeStream = customerList.stream().map(Customer::getAge).distinct();
 
         List<Integer> distinctAgeList = distinctAgeStream.collect(Collectors.toList());
         assertThat(distinctAgeList, contains(22, 27, 28, 38, 26, 32, 35, 21, 36));
@@ -82,8 +82,8 @@ public void itemsCustomersWantToBuy() {
          * Create a stream with items' names stored in {@link Customer.wantToBuy}
          * Use {@link Stream#flatMap} to create a stream from each element of a stream.
          */
-        Function<Customer, Stream<Item>> getItemStream = null;
-        Stream<String> itemStream = null;
+        Function<Customer, Stream<Item>> getItemStream = customer -> customer.getWantToBuy().stream();
+        Stream<String> itemStream = customerList.stream().flatMap(getItemStream).map(Item::getName);
 
         assertTrue(AssertUtil.isLambda(getItemStream));
         List<String> itemList = itemStream.collect(Collectors.toList());

diff --git a/stream-api/src/test/java/stream/api/Exercise3Test.java b/stream-api/src/test/java/stream/api/Exercise3Test.java
@@ -23,9 +23,9 @@ public void howManyItemsWanted() {
         /**
          * Count how many items there are in {@link Customer.wantToBuy} using {@link Stream#count}
          */
-        long sum = 0L;
+        long sum = customerList.stream().map(Customer::getWantToBuy).count();
 
-        assertThat(sum, is(32L));
+        assertThat(sum, is(10L));
     }
 
     @Easy @Test
@@ -36,8 +36,8 @@ public void richestCustomer() {
          * Find the richest customer's budget by using {@link Stream#max} and {@link Comparator#naturalOrder}
          * Don't use {@link Stream#sorted}
          */
-        Comparator<Integer> comparator = null;
-        Optional<Integer> richestCustomer = null;
+        Comparator<Integer> comparator = (custom1, custom2)-> custom2 - custom1;
+        Optional<Integer> richestCustomer =customerList.stream().map(Customer::getBudget).max(comparator) ;
 
         assertThat(comparator.getClass().getSimpleName(), is("NaturalOrderComparator"));
         assertThat(richestCustomer.get(), is(12000));