From 601abefbcf025639b99f254f3e40f48b1a69177f Mon Sep 17 00:00:00 2001
From: Claudio Maggioni <claudio@maggioni.xyz>
Date: Mon, 9 Dec 2019 21:44:08 +0100
Subject: [PATCH] HW3: preparing for submission

---
 hw3/.idea/hw3.iml                       |  12 +
 hw3/.idea/misc.xml                      |   9 +
 hw3/.idea/modules.xml                   |   8 +
 hw3/.idea/vcs.xml                       |   6 +
 hw3/.idea/workspace.xml                 | 495 ++++++++++++++++++++++++
 hw3/ex3_test.txt                        |   4 +
 hw3/src/fp/FunctionsUtil.java           |  15 +
 hw3/src/fp/IntOperatorsUtil.java        |  31 ++
 hw3/src/streams/FileLinesProcessor.java | 115 ++++++
 hw3/submission.tex                      |  71 ++++
 10 files changed, 766 insertions(+)
 create mode 100644 hw3/.idea/hw3.iml
 create mode 100644 hw3/.idea/misc.xml
 create mode 100644 hw3/.idea/modules.xml
 create mode 100644 hw3/.idea/vcs.xml
 create mode 100644 hw3/.idea/workspace.xml
 create mode 100644 hw3/ex3_test.txt
 create mode 100644 hw3/src/fp/FunctionsUtil.java
 create mode 100644 hw3/src/fp/IntOperatorsUtil.java
 create mode 100644 hw3/src/streams/FileLinesProcessor.java
 create mode 100644 hw3/submission.tex

diff --git a/hw3/.idea/hw3.iml b/hw3/.idea/hw3.iml
new file mode 100644
index 0000000..b319ae2
--- /dev/null
+++ b/hw3/.idea/hw3.iml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/out" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/hw3/.idea/misc.xml b/hw3/.idea/misc.xml
new file mode 100644
index 0000000..0c31c09
--- /dev/null
+++ b/hw3/.idea/misc.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_12" default="false" project-jdk-name="12.0.1" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/hw3/.idea/modules.xml b/hw3/.idea/modules.xml
new file mode 100644
index 0000000..aa50f2a
--- /dev/null
+++ b/hw3/.idea/modules.xml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/hw3.iml" filepath="$PROJECT_DIR$/.idea/hw3.iml" />
+    </modules>
+  </component>
+</project>
\ No newline at end of file
diff --git a/hw3/.idea/vcs.xml b/hw3/.idea/vcs.xml
new file mode 100644
index 0000000..6c0b863
--- /dev/null
+++ b/hw3/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/hw3/.idea/workspace.xml b/hw3/.idea/workspace.xml
new file mode 100644
index 0000000..986b4a9
--- /dev/null
+++ b/hw3/.idea/workspace.xml
@@ -0,0 +1,495 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="cf07aeb8-47a7-429b-9024-1f8bf10e85cc" name="Default Changelist" comment="">
+      <change afterPath="$PROJECT_DIR$/ex3_test.txt" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/../hw2/Ex2/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/../hw2/Ex2/.idea/workspace.xml" afterDir="false" />
+    </list>
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="DefaultGradleProjectSettings">
+    <option name="isMigrated" value="true" />
+  </component>
+  <component name="FileEditorManager">
+    <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
+      <file pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/submission.tex">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="367">
+              <caret line="53" column="25" selection-start-line="53" selection-start-column="25" selection-end-line="53" selection-end-column="25" />
+              <folding>
+                <element signature="e#39#66#2" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/fp/IntOperatorsUtil.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="165">
+              <caret line="12" column="5" selection-start-line="12" selection-start-column="5" selection-end-line="12" selection-end-column="5" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/fp/FunctionsUtil.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="135">
+              <caret line="10" selection-start-line="10" selection-end-line="10" />
+              <folding>
+                <element signature="e#194#195#0" expanded="true" />
+                <element signature="e#229#230#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/streams/FileLinesProcessor.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="280">
+              <caret line="99" column="22" selection-start-line="99" selection-start-column="22" selection-end-line="99" selection-end-column="22" />
+              <folding>
+                <element signature="imports" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/ex3_test.txt">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="60">
+              <caret line="4" selection-start-line="4" selection-end-line="4" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+    </leaf>
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="FindInProjectRecents">
+    <findStrings>
+      <find>lang</find>
+    </findStrings>
+  </component>
+  <component name="Git.Settings">
+    <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$/.." />
+  </component>
+  <component name="IdeDocumentHistory">
+    <option name="CHANGED_PATHS">
+      <list>
+        <option value="$PROJECT_DIR$/src/Cose.java" />
+        <option value="$PROJECT_DIR$/src/fp/IntOperatorsUtil.java" />
+        <option value="$PROJECT_DIR$/src/fp/FunctionsUtil.java" />
+        <option value="$PROJECT_DIR$/ex3_test.txt" />
+        <option value="$PROJECT_DIR$/src/streams/FileLinesProcessor.java" />
+        <option value="$PROJECT_DIR$/submission.tex" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectConfigurationFiles">
+    <option name="files">
+      <list>
+        <option value="$PROJECT_DIR$/.idea/hw3.iml" />
+        <option value="$PROJECT_DIR$/.idea/misc.xml" />
+        <option value="$PROJECT_DIR$/.idea/vcs.xml" />
+        <option value="$PROJECT_DIR$/.idea/modules.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectFrameBounds" fullScreen="true">
+    <option name="width" value="1680" />
+    <option name="height" value="1050" />
+  </component>
+  <component name="ProjectLevelVcsManager" settingsEditedManually="true" />
+  <component name="ProjectView">
+    <navigator proportions="" version="1">
+      <foldersAlwaysOnTop value="true" />
+    </navigator>
+    <panes>
+      <pane id="ProjectPane">
+        <subPane>
+          <expand>
+            <path>
+              <item name="hw3" type="b2602c69:ProjectViewProjectNode" />
+              <item name="hw3" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="hw3" type="b2602c69:ProjectViewProjectNode" />
+              <item name="hw3" type="462c0819:PsiDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="hw3" type="b2602c69:ProjectViewProjectNode" />
+              <item name="hw3" type="462c0819:PsiDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+              <item name="fp" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="hw3" type="b2602c69:ProjectViewProjectNode" />
+              <item name="hw3" type="462c0819:PsiDirectoryNode" />
+              <item name="src" type="462c0819:PsiDirectoryNode" />
+              <item name="streams" type="462c0819:PsiDirectoryNode" />
+            </path>
+          </expand>
+          <select />
+        </subPane>
+      </pane>
+      <pane id="Scope" />
+      <pane id="PackagesPane" />
+    </panes>
+  </component>
+  <component name="PropertiesComponent">
+    <property name="ASKED_SHARE_PROJECT_CONFIGURATION_FILES" value="true" />
+    <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="aspect.path.notification.shown" value="true" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
+    <property name="nodejs_interpreter_path.stuck_in_default_project" value="undefined stuck path" />
+    <property name="nodejs_npm_path_reset_for_default_project" value="true" />
+    <property name="project.structure.last.edited" value="Project" />
+    <property name="project.structure.proportion" value="0.15" />
+    <property name="project.structure.side.proportion" value="0.2" />
+  </component>
+  <component name="RunDashboard">
+    <option name="ruleStates">
+      <list>
+        <RuleState>
+          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
+        </RuleState>
+        <RuleState>
+          <option name="name" value="StatusDashboardGroupingRule" />
+        </RuleState>
+      </list>
+    </option>
+  </component>
+  <component name="RunManager" selected="LaTeX.submission">
+    <configuration name="FileLinesProcessor" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="streams.FileLinesProcessor" />
+      <module name="hw3" />
+      <option name="VM_PARAMETERS" value="-ea" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="streams.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="FunctionsUtil" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="fp.FunctionsUtil" />
+      <module name="hw3" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="fp.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="IntOperatorsUtil" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="fp.IntOperatorsUtil" />
+      <module name="hw3" />
+      <extension name="coverage">
+        <pattern>
+          <option name="PATTERN" value="fp.*" />
+          <option name="ENABLED" value="true" />
+        </pattern>
+      </extension>
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <configuration name="submission bibliography" type="BIBTEX_RUN_CONFIGURATION" factoryName="LaTeX configuration factory">
+      <texify-bibtex>
+        <compiler>BIBTEX</compiler>
+        <compiler-path />
+        <compiler-arguments />
+        <main-file>$PROJECT_DIR$/submission.tex</main-file>
+        <aux-dir />
+      </texify-bibtex>
+      <method v="2" />
+    </configuration>
+    <configuration name="submission (1)" type="LATEX_RUN_CONFIGURATION" factoryName="LaTeX configuration factory" temporary="true">
+      <texify>
+        <compiler>PDFLATEX</compiler>
+        <compiler-path />
+        <sumatra-path />
+        <viewer-command />
+        <compiler-arguments />
+        <main-file>$PROJECT_DIR$/submission.tex</main-file>
+        <aux-dir>false</aux-dir>
+        <out-dir>false</out-dir>
+        <output-format>PDF</output-format>
+        <bib-run-config>BibTeX.submission bibliography</bib-run-config>
+      </texify>
+      <method v="2" />
+    </configuration>
+    <configuration name="submission" type="LATEX_RUN_CONFIGURATION" factoryName="LaTeX configuration factory">
+      <texify>
+        <compiler>PDFLATEX</compiler>
+        <compiler-path>/Library/TeX/texbin/pdflatex</compiler-path>
+        <sumatra-path />
+        <viewer-command>open -a Skim {pdf}</viewer-command>
+        <compiler-arguments />
+        <main-file>$PROJECT_DIR$/submission.tex</main-file>
+        <aux-dir>false</aux-dir>
+        <out-dir>false</out-dir>
+        <output-format>PDF</output-format>
+        <bib-run-config>BibTeX.submission bibliography</bib-run-config>
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+      <item itemvalue="Application.IntOperatorsUtil" />
+      <item itemvalue="Application.FunctionsUtil" />
+      <item itemvalue="Application.FileLinesProcessor" />
+      <item itemvalue="BibTeX.submission bibliography" />
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+      <item itemvalue="LaTeX.submission (1)" />
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+    <recent_temporary>
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+        <item itemvalue="Application.FileLinesProcessor" />
+        <item itemvalue="Application.FunctionsUtil" />
+        <item itemvalue="Application.IntOperatorsUtil" />
+        <item itemvalue="LaTeX.submission (1)" />
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+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="cf07aeb8-47a7-429b-9024-1f8bf10e85cc" name="Default Changelist" comment="" />
+      <created>1575886303360</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1575886303360</updated>
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+      <workItem from="1575886414622" duration="3616000" />
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+    <servers />
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+  <component name="TimeTrackingManager">
+    <option name="totallyTimeSpent" value="14437000" />
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+    <states>
+      <state key="ArtifactsStructureConfigurable.UI">
+        <settings>
+          <artifact-editor />
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="FacetStructureConfigurable.UI">
+        <settings>
+          <last-edited>No facets are configured</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="GlobalLibrariesConfigurable.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="JdkListConfigurable.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ModuleStructureConfigurable.UI">
+        <settings>
+          <last-edited>hw3</last-edited>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+                <option value="0.6" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+      <state key="ProjectLibrariesConfigurable.UI">
+        <settings>
+          <splitter-proportions>
+            <option name="proportions">
+              <list>
+                <option value="0.2" />
+              </list>
+            </option>
+          </splitter-proportions>
+        </settings>
+      </state>
+    </states>
+  </component>
+</project>
\ No newline at end of file
diff --git a/hw3/ex3_test.txt b/hw3/ex3_test.txt
new file mode 100644
index 0000000..c7ce050
--- /dev/null
+++ b/hw3/ex3_test.txt
@@ -0,0 +1,4 @@
+abc
+xyz
+hello world
+play with streams
diff --git a/hw3/src/fp/FunctionsUtil.java b/hw3/src/fp/FunctionsUtil.java
new file mode 100644
index 0000000..7ee6284
--- /dev/null
+++ b/hw3/src/fp/FunctionsUtil.java
@@ -0,0 +1,15 @@
+package fp;
+
+import java.util.function.BiFunction;
+import java.util.function.Function;
+
+public class FunctionsUtil {
+  public static <T, U, V> Function<U, V> partial(BiFunction<T, U, V> f, T x) {
+    return u -> f.apply(x, u);
+  }
+
+  public static void main(String... args) {
+    BiFunction<String, String, Boolean> f = String::startsWith;
+    System.out.println(FunctionsUtil.partial(f, "abc").apply("a")); // true
+  }
+}
diff --git a/hw3/src/fp/IntOperatorsUtil.java b/hw3/src/fp/IntOperatorsUtil.java
new file mode 100644
index 0000000..5f54ab7
--- /dev/null
+++ b/hw3/src/fp/IntOperatorsUtil.java
@@ -0,0 +1,31 @@
+package fp;
+
+import java.util.function.IntBinaryOperator;
+import java.util.function.IntUnaryOperator;
+
+public class IntOperatorsUtil {
+    public static IntUnaryOperator compose(IntUnaryOperator... functions) {
+        IntUnaryOperator f = i -> i;
+        for (IntUnaryOperator g : functions) {
+            f = f.andThen(g);
+        }
+        return f;
+    }
+
+    public static IntUnaryOperator partial(IntBinaryOperator f, int x) {
+        return i -> f.applyAsInt(x, i);
+    }
+
+    public static void main(String... args) {
+        IntUnaryOperator[] functions = {
+                compose(),
+                compose(x -> x + 1),
+                compose(x -> x * 2, x -> x + 1),
+                compose(x -> x + 1, x -> x * 2),
+                compose(x -> x + 1, x -> x * 2, x -> x + 1)
+        };
+        for (IntUnaryOperator f : functions) System.out.println(f.applyAsInt(1));
+
+        IntOperatorsUtil.partial((x, y) -> x-y, 1).applyAsInt(2); // -1
+    }
+}
diff --git a/hw3/src/streams/FileLinesProcessor.java b/hw3/src/streams/FileLinesProcessor.java
new file mode 100644
index 0000000..98bd31e
--- /dev/null
+++ b/hw3/src/streams/FileLinesProcessor.java
@@ -0,0 +1,115 @@
+package streams;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+
+public class FileLinesProcessor {
+
+    private final String filename;
+
+    FileLinesProcessor(String filename) {
+        this.filename = filename;
+    }
+
+    private Stream<String> getLines() throws IOException {
+        return Files.lines(Paths.get(filename));
+    }
+
+    public byte[][] fileLinesAsBytes() throws IOException {
+        return getLines().map(String::getBytes).toArray(byte[][]::new);
+    }
+
+    public long countByNumberOfSpaces(int n) throws IOException {
+        return getLines()
+                .map(s -> s.chars()
+                        .filter(c -> c == ' ')
+                        .count())
+                .filter(c -> c == n).count();
+    }
+
+    public String concatNth(int n) throws IOException {
+        return getLines()
+                .map(s -> n >= s.length() ? "" : s.substring(n, n + 1))
+                .collect(Collectors.joining());
+    }
+
+    public Map<Integer, List<String>> groupByLineLength() throws IOException {
+        return getLines()
+                .collect(Collectors.groupingBy(String::length, Collectors.toList()));
+    }
+
+    public Map<Character, Long> countCharsOccurrences() throws IOException {
+        return getLines()
+                .map(String::chars)
+                .reduce(IntStream.of(), IntStream::concat)
+                .boxed()
+                .collect(Collectors.groupingBy(i -> (char) (i & 0xFFFF), Collectors.counting()));
+    }
+
+    public Map<Character, Long> countCharsOccurrences(int n) throws IOException {
+        return getLines()
+                .map(String::chars)
+                .reduce(IntStream.of(), IntStream::concat)
+                .boxed()
+                .collect(Collectors.groupingBy(i -> (char) (i & 0xFFFF), Collectors.counting()))
+                .entrySet()
+                .stream()
+                .filter(e -> e.getValue() > n)
+                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
+    }
+
+    public static void main(final String... args) throws IOException {
+        final FileLinesProcessor processor = new FileLinesProcessor("ex3_test.txt");
+        assert processor.fileLinesAsBytes()[0][1] == 'b';
+        assert processor.fileLinesAsBytes()[1][2] == 'z';
+        assert processor.countByNumberOfSpaces(0) == 2; // (i.e., "abc" and "xyz")
+        assert processor.countByNumberOfSpaces(2) == 1; // (i.e., "play with streams")
+        assert "axhp".equals(processor.concatNth(0));
+        assert "byel".equals(processor.concatNth(1));
+        assert "ly".equals(processor.concatNth(3));
+
+        final Map<Integer, List<String>> expected = new HashMap<>();
+        expected.put(3, Arrays.asList("abc", "xyz"));
+        expected.put(11, Collections.singletonList("hello world"));
+        expected.put(17, Collections.singletonList("play with streams"));
+        assert expected.equals(processor.groupByLineLength()); // Expected result: {3=[abc, xyz], 11=[hello world],
+                                                               // 17=[play with streams]}
+
+        final Map<Character, Long> expected2 = new HashMap<>();
+        expected2.put(' ', 3L);
+        expected2.put('a', 3L);
+        expected2.put('b', 1L);
+        expected2.put('c', 1L);
+        expected2.put('d', 1L);
+        expected2.put('e', 2L);
+        expected2.put('h', 2L);
+        expected2.put('i', 1L);
+        expected2.put('l', 4L);
+        expected2.put('m', 1L);
+        expected2.put('o', 2L);
+        expected2.put('p', 1L);
+        expected2.put('r', 2L);
+        expected2.put('s', 2L);
+        expected2.put('t', 2L);
+        expected2.put('w', 2L);
+        expected2.put('x', 1L);
+        expected2.put('y', 2L);
+        expected2.put('z', 1L);
+        assert expected2.equals(processor.countCharsOccurrences()); // Expected result { =3, a=3, b=1, c=1, d=1, e=2,
+                                                                    // h=2, i=1, l=4, m=1, o=2, p=1, r=2, s=2, t=2, w=2,
+                                                                    // x=1, y=2, z=1}
+        final Map<Character, Long> expected3 = new HashMap<>();
+        expected3.put(' ', 3L);
+        expected3.put('a', 3L);
+        expected3.put('l', 4L);
+        assert expected3.equals(processor.countCharsOccurrences(2)); // Expected result: { =3, a=3, l=4}
+
+        System.out.println("OK");
+    }
+}
diff --git a/hw3/submission.tex b/hw3/submission.tex
new file mode 100644
index 0000000..d2d555d
--- /dev/null
+++ b/hw3/submission.tex
@@ -0,0 +1,71 @@
+\documentclass[12pt,a4paper]{article}
+
+\usepackage[utf8]{inputenc}
+\usepackage[margin=2cm]{geometry}
+\usepackage{listings}
+\usepackage{xcolor}
+\usepackage{lmodern}
+
+\title{Howework 3 -- Programming Fundamentals 3}
+\author{Claudio Maggioni}
+
+\lstset{
+    basicstyle=\small\ttfamily,
+    frame=shadowbox,
+    rulesepcolor=\color{black},
+    columns=fullflexible,
+    commentstyle=\color{gray},
+    keywordstyle=\bfseries,
+    escapeinside={\%*}{*)},
+    aboveskip=2em,
+    captionpos=b,
+    abovecaptionskip=1em,
+    belowcaptionskip=1em
+}
+
+\begin{document}
+\maketitle
+\tableofcontents
+
+\section{Exercise 1}
+\subsection{Exercise 1.1}
+\paragraph{Example 1:}
+The code will compile and run normally since Integer implements Number
+and therefore it is a satisfiable parameter for
+\texttt{Box<Number>.put(Number)}.
+
+\paragraph{Example 2:}
+The code will compile, but it will terminate with a NullPointerException.
+The implicit unboxing of the return value of \texttt{iBox.get()} will call
+the method \texttt{intValue()} on the object returned. But, since the Box object
+contains an empty reference, this call will fail and thus cause a
+\texttt{NullPointerException}.
+
+\paragraph{Example 3:}
+This code will not compile since \texttt{Box<Integer>.put()} requires an integer
+as an argument, but a \texttt{double} is provided.
+
+\subsection{Exercise 1.2}
+\begin{lstlisting}[language=Java, caption=New signature of Box.put(...)]
+public void put(Box<? extends T> box) { ... };
+\end{lstlisting}
+
+
+\subsection{Exercise 1.3}
+\begin{lstlisting}[language=Java, caption=New signature of Box.put(...)]
+public boolean containsSame(Box<? extends T> o,
+                               EqualityComparator<? super T> c) { ... };
+\end{lstlisting}
+
+
+\section{Exercise 2}
+\subsection{Exercise 2.1}
+\begin{lstlisting}[language=Java, caption=BiPredicate with lambda]
+BiPredicate<String, String> firstStartsWithSecond = (s, s2) -> s.startsWith(s2);
+\end{lstlisting}
+
+\begin{lstlisting}[language=Java, caption=BIPredicate with method reference]
+BiPredicate<String, String> firstStartsWithSecond = String::startsWith;
+\end{lstlisting}
+
+\end{document}