kasra.tavafi/WS-07-Multithreading-Basics-and-Hashing
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WS7 #1

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Aryan merged 2 commits from develop into main 2026-07-17 06:06:21 +00:00
Conversation 0 Commits 2 Files Changed 12
+142 -157
12 changed files with 142 additions and 157 deletions
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.idea/.gitignore
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+10
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@@ -0,0 +1,10 @@
# Default ignored files
/shelf/
/workspace.xml
# Editor-based HTTP Client requests
/httpRequests/
# Ignored default folder with query files
/queries/
# Datasource local storage ignored files
/dataSources/
/dataSources.local.xml
.idea/compiler.xml
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+13
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@@ -0,0 +1,13 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="CompilerConfiguration">
<annotationProcessing>
<profile name="Maven default annotation processors profile" enabled="true">
<sourceOutputDir name="target/generated-sources/annotations" />
<sourceTestOutputDir name="target/generated-test-sources/test-annotations" />
<outputRelativeToContentRoot value="true" />
<module name="WS-07-Multithreading-Basics-and-Hashing" />
</profile>
</annotationProcessing>
</component>
</project>
.idea/encodings.xml
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+7
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@@ -0,0 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="Encoding">
<file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
<file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
</component>
</project>
.idea/jarRepositories.xml
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+20
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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="RemoteRepositoriesConfiguration">
<remote-repository>
<option name="id" value="central" />
<option name="name" value="Central Repository" />
<option name="url" value="https://repo.maven.apache.org/maven2" />
</remote-repository>
<remote-repository>
<option name="id" value="central" />
<option name="name" value="Maven Central repository" />
<option name="url" value="https://repo1.maven.org/maven2" />
</remote-repository>
<remote-repository>
<option name="id" value="jboss.community" />
<option name="name" value="JBoss Community repository" />
<option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
</remote-repository>
</component>
</project>
.idea/misc.xml
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+12
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@@ -0,0 +1,12 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="ExternalStorageConfigurationManager" enabled="true" />
<component name="MavenProjectsManager">
<option name="originalFiles">
<list>
<option value="$PROJECT_DIR$/pom.xml" />
</list>
</option>
</component>
<component name="ProjectRootManager" version="2" languageLevel="JDK_25" default="true" project-jdk-name="ms-25" project-jdk-type="JavaSDK" />
</project>
.idea/vcs.xml
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@@ -0,0 +1,6 @@
<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="VcsDirectoryMappings">
<mapping directory="" vcs="Git" />
</component>
</project>
src/main/java/dev/Main.java
+21 -43
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@@ -8,92 +8,70 @@ import java.util.List;
import java.util.Scanner;
public class Main {
public static void main(String[] args) throws Exception {
Scanner scanner = new Scanner(System.in);
StudentManager manager = new StudentManager();
while (true) {
System.out.println("""
1.Load students
2.Search student
3.Remove student
4.Print students
5.Exit
""");
5.Exit""");
int choice = scanner.nextInt();
switch (choice) {
case 1 -> {
List<String> data = FileManager.loadStudents("students.txt");
// TODO:
int size = data.size();
int part1Size = size / 3;
int part2Size = 2 * size / 3;
// Split data into 3 parts
List<String> part1 = data.subList(0, part1Size);
List<String> part2 = data.subList(part1Size, part2Size);
List<String> part3 = data.subList(part2Size, size);
List<String> part1 = null;
StudentLoader t1 = new StudentLoader(part1);
StudentLoader t2 = new StudentLoader(part2);
StudentLoader t3 = new StudentLoader(part3);
List<String> part2 = null;
t1.start();
t2.start();
t3.start();
List<String> part3 = null;
t1.join();
t2.join();
t3.join();
// TODO:
StudentLoader t1 = null;
StudentLoader t2 = null;
StudentLoader t3 = null;
// TODO:
// start()
// join()
// merge results
manager.addStudents(t1.getStudents());
manager.addStudents(t2.getStudents());
manager.addStudents(t3.getStudents());
System.out.println("Students loaded successfully.");
}
case 2 -> {
System.out.print("ID: ");
int id = scanner.nextInt();
System.out.println(manager.searchStudent(id));
}
case 3 -> {
System.out.print("ID: ");
int id = scanner.nextInt();
boolean removed = manager.removeStudent(id);
System.out.println(removed);
}
case 4 ->
manager.printStudents();
case 4 -> manager.printStudents();
case 5 -> {
return;
}
}
}
}
}
src/main/java/dev/model/Student.java
+6 -34
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@@ -1,21 +1,12 @@
package dev.model;
public class Student {
private final int id;
private final String name;
private final String major;
private final double gpa;
public Student(
int id,
String name,
String major,
double gpa) {
public Student(int id, String name, String major, double gpa) {
this.id = id;
this.name = name;
this.major = major;
@@ -40,36 +31,18 @@ public class Student {
@Override
public int hashCode() {
// TODO:
// Return custom hash
// Example:
// return id % 97;
return 0;
return id % 97;
}
@Override
public boolean equals(Object obj) {
// TODO:
// Step 1:
// Check null
// Step 2:
// Convert obj to Student
// Step 3:
// Compare IDs
return false;
if (this == obj) return true;
if (obj == null || getClass() != obj.getClass()) return false;
Student student = (Student) obj;
return id == student.id;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
@@ -77,5 +50,4 @@ public class Student {
", gpa=" + gpa +
'}';
}
}
src/main/java/dev/service/StudentManager.java
+12 -30
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@@ -1,55 +1,37 @@
package dev.service;
import dev.model.Student;
import java.util.ArrayList;
public class StudentManager {
private final ArrayList<Student> students = new ArrayList<>();
public void addStudents(ArrayList<Student> newStudents) {
// TODO:
// Merge students
// Hint:
// addAll()
students.addAll(newStudents);
}
public Student searchStudent(int id) {
// TODO:
// Loop through students
// Compare IDs
for (Student student : students) {
if (student.getId() == id) {
return student;
}
}
return null;
}
public boolean removeStudent(int id) {
// TODO:
// Find student
// Remove student
for (int i = 0; i < students.size(); i++) {
if (students.get(i).getId() == id) {
students.remove(i);
return true;
}
}
return false;
}
public void printStudents() {
for (Student student : students) {
System.out.println(student);
}
}
}
src/main/java/dev/thread/StudentLoader.java
+8 -34
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@@ -1,59 +1,33 @@
package dev.thread;
import dev.model.Student;
import java.util.ArrayList;
import java.util.List;
public class StudentLoader extends Thread {
// Assigned file lines
private final List<String> lines;
// Local student storage
private final ArrayList<Student> students = new ArrayList<>();
public StudentLoader(List<String> lines) {
this.lines = lines;
}
@Override
public void run() {
// TODO:
/*
Example line:
1001,Aryan,Computer Science,3.7
*/
for (String line : lines) {
String[] data = line.split(",");
if (data.length == 4) {
int id = Integer.parseInt(data[0].trim());
String name = data[1].trim();
String major = data[2].trim();
double gpa = Double.parseDouble(data[3].trim());
// TODO:
// split line
// TODO:
// read values
// TODO:
// create Student
// TODO:
// add to students list
students.add(new Student(id, name, major, gpa));
}
}
}
public ArrayList<Student> getStudents() {
return students;
}
}
src/main/java/dev/utils/FileManager.java
+1 -11
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@@ -2,31 +2,21 @@ package dev.utils;
import java.io.BufferedReader;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;
public class FileManager {
public static List<String> loadStudents(String path) throws Exception {
List<String> lines = new ArrayList<>();
BufferedReader reader = new BufferedReader(new FileReader(path));
String line;
while ((line = reader.readLine()) != null) {
// TODO:
// Add line to list
lines.add(line);
}
reader.close();
return lines;
}
}
src/main/java/lecture/multithreading/timeout/Main.java
+26 -5
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@@ -1,10 +1,31 @@
package lecture.multithreading.timeout;
public class Main {
public static void main(String[] args) {
// TODO
}
}
Thread worker = new Thread(() -> {
try {
System.out.println("Worker thread started...");
Thread.sleep(5000);
System.out.println("Worker thread finished its job.");
} catch (InterruptedException e) {
System.out.println("Worker thread was interrupted (Timeout reached)!");
}
});
worker.start();
try {
worker.join(2000);
if (worker.isAlive()) {
System.out.println("Main thread: Task took too long. Interrupting...");
worker.interrupt();
} else {
System.out.println("Main thread: Task completed within the time limit.");
}
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}