HW3: preparing for submission
This commit is contained in:
Claudio Maggioni
parent
cb78907485
commit
601abefbcf
10 changed files with 766 additions and 0 deletions
12
hw3/.idea/hw3.iml
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12
hw3/.idea/hw3.iml
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9
hw3/.idea/misc.xml
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9
hw3/.idea/misc.xml
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8
hw3/.idea/modules.xml
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8
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6
hw3/.idea/vcs.xml
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6
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495
hw3/.idea/workspace.xml
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495
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|
||||
4
hw3/ex3_test.txt
Normal file
4
hw3/ex3_test.txt
Normal file
|
|
@ -0,0 +1,4 @@
|
|||
abc
|
||||
xyz
|
||||
hello world
|
||||
play with streams
|
||||
15
hw3/src/fp/FunctionsUtil.java
Normal file
15
hw3/src/fp/FunctionsUtil.java
Normal file
|
|
@ -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
|
||||
}
|
||||
}
|
||||
31
hw3/src/fp/IntOperatorsUtil.java
Normal file
31
hw3/src/fp/IntOperatorsUtil.java
Normal file
|
|
@ -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
|
||||
}
|
||||
}
|
||||
115
hw3/src/streams/FileLinesProcessor.java
Normal file
115
hw3/src/streams/FileLinesProcessor.java
Normal file
|
|
@ -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");
|
||||
}
|
||||
}
|
||||
71
hw3/submission.tex
Normal file
71
hw3/submission.tex
Normal file
|
|
@ -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}
|
||||
Reference in a new issue