ZahraSadatMirvakili/WS-07-Multithreading-Basics-and-Hashing
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Merge PR 'WS-07-Multithreading-Basics-and-Hashing' (#1) from develop into main

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This commit was merged in pull request #1.
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MehrdadShirvani
2026-07-10 17:16:40 +00:00
parent 83746b88f6 160475f978
commit 6e2370d646
13 changed files with 180 additions and 109 deletions
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.idea/.gitignore
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@@ -0,0 +1,10 @@
# Default ignored files
/shelf/
/workspace.xml
# Ignored default folder with query files
/queries/
# Datasource local storage ignored files
/dataSources/
/dataSources.local.xml
# Editor-based HTTP Client requests
/httpRequests/
.idea/compiler.xml
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<?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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<?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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<?xml version="1.0" encoding="UTF-8"?>
<project version="4">
<component name="RemoteRepositoriesConfiguration">
<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>
<remote-repository>
<option name="id" value="central" />
<option name="name" value="Central Repository" />
<option name="url" value="https://mirror-maven.runflare.com/maven2" />
</remote-repository>
</component>
</project>
.idea/misc.xml
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<?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" project-jdk-name="25" project-jdk-type="JavaSDK" />
</project>
.idea/vcs.xml
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<?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
+24 -29
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@@ -12,18 +12,17 @@ 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("\n--- Student Search Engine Menu ---");
System.out.println("1. Load students");
System.out.println("2. Search student");
System.out.println("3. Remove student");
System.out.println("4. Print all students");
System.out.println("5. Exit");
System.out.print("Enter your choice: ");
System.out.println("""
1.Load students
2.Search student
3.Remove student
4.Print students
5.Exit
""");
int choice = scanner.nextInt();
@@ -33,32 +32,28 @@ public class Main {
List<String> data = FileManager.loadStudents("students.txt");
// TODO:
int size = data.size();
List<String> part1 = data.subList(0, size/3);
List<String> part2 = data.subList(size/3, (size/3)*2);
List<String> part3 = data.subList((size/3)*2, size);
// Split data into 3 parts
StudentLoader t1 = new StudentLoader(part1);
StudentLoader t2 = new StudentLoader(part2);
StudentLoader t3 = new StudentLoader(part3);
List<String> part1 = null;
t1.start();
t2.start();
t3.start();
List<String> part2 = null;
t1.join();
t2.join();
t3.join();
List<String> part3 = null;
// 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("Student loaded successfully.");
}
case 2 -> {
src/main/java/dev/model/Student.java
+9 -18
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@@ -40,31 +40,22 @@ 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:
if(obj == null){
return false;
}
// Step 1:
// Check null
if(getClass() != obj.getClass()){
return false;
}
Student otherStudent = (Student)obj;
// Step 2:
// Convert obj to Student
// Step 3:
// Compare IDs
return false;
return this.id == otherStudent.id;
}
@Override
src/main/java/dev/service/StudentManager.java
+23 -24
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@@ -4,50 +4,49 @@ 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()
if(newStudents != null){
this.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) {
Student foundStudent = null;
for (Student s : students){
if (s.getId() == id){
foundStudent = s;
break;
}
}
// TODO:
// Find student
// Remove student
if (foundStudent != null){
students.remove(foundStudent);
return true;
}
return false;
}
public void printStudents() {
if (students.isEmpty()) {
System.out.println("No students to display.");
return;
}
for (Student student : students) {
System.out.println(student);
}
}
src/main/java/dev/thread/StudentLoader.java
+19 -27
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@@ -9,46 +9,38 @@ 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) {
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) {
if(line == null || line.trim().isEmpty()){
continue;
}
String[] parts = line.split(",");
// TODO:
// split line
// TODO:
// read values
// TODO:
// create Student
// TODO:
// add to students list
if(parts.length == 4){
try {
int id = Integer.parseInt(parts[0].trim());
String name = parts[1].trim();
String major = parts[2].trim();
double gpa = Double.parseDouble(parts[3].trim());
Student student = new Student(id, name, major, gpa);
students.add(student);
}catch (Exception e){
System.out.println(e.getMessage());
}
}else{
System.out.println("skipping malformed line: " + line);
}
}
}
public ArrayList<Student> getStudents() {
src/main/java/dev/utils/FileManager.java
+3 -10
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@@ -13,20 +13,13 @@ public class FileManager {
List<String> lines = new ArrayList<>();
BufferedReader reader = new BufferedReader(new FileReader(path));
String line;
while ((line = reader.readLine()) != null) {
// TODO:
// Add line to list
if (!line.trim().isEmpty()) {
lines.add(line.trim());
}
}
reader.close();
return lines;
}
}
src/main/java/lecture/multithreading/timeout/Main.java
+14 -1
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@@ -1,10 +1,23 @@
package lecture.multithreading.timeout;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
// TODO
Scanner scanner = new Scanner(System.in);
System.out.println("you have 10 seconds: ");
System.out.println("enter your name: ");
MyRunnable myRunnable = new MyRunnable();
Thread thread = new Thread(myRunnable);
thread.setDaemon(true);
thread.start();
String name = scanner.nextLine();
System.out.println("Hello " + name);
scanner.close();
}
}
src/main/java/lecture/multithreading/timeout/MyRunnable.java
+20
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@@ -0,0 +1,20 @@
package lecture.multithreading.timeout;
public class MyRunnable implements Runnable{
@Override
public void run() {
for (int i = 0; i <= 10; i++) {
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
System.out.println("thread was interrupted");
}
if(i==10){
System.out.println("time is up");
System.exit(0);
}
}
}
}