neda/WS-07-Multithreading-Basics-and-Hashing
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multihreading

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neda
2026-07-19 06:17:24 +03:30
parent 83746b88f6
commit ddea31c4fd
13 changed files with 321 additions and 85 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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@@ -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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@@ -0,0 +1,20 @@
<?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://maven.devneeds.ir/" />
</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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@@ -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" project-jdk-name="26" 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
+141 -20
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@@ -1,22 +1,34 @@
package dev;
import dev.model.Student;
import dev.service.StudentManager;
import dev.thread.StudentLoader;
import dev.utils.FileManager;
import java.util.ArrayList;
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();
StudentManager manager =
new StudentManager();
while (true) {
System.out.println("""
1.Load students
2.Search student
@@ -25,71 +37,180 @@ public class Main {
5.Exit
""");
int choice = scanner.nextInt();
switch (choice) {
case 1 -> {
List<String> data = FileManager.loadStudents("students.txt");
// TODO:
List<String> data =
FileManager.loadStudents("students.txt");
// Split data into 3 parts
List<String> part1 = null;
List<String> part2 = null;
int size = data.size();
List<String> part3 = null;
// TODO:
int part = (int)Math.ceil(size / 3.0);
StudentLoader t1 = null;
StudentLoader t2 = null;
StudentLoader t3 = null;
List<String> part1 =
data.subList(
0,
Math.min(part,size)
);
// TODO:
// start()
List<String> part2 =
data.subList(
Math.min(part,size),
Math.min(part*2,size)
);
// join()
// merge results
List<String> part3 =
data.subList(
Math.min(part*2,size),
size
);
StudentLoader t1 =
new StudentLoader(part1);
StudentLoader t2 =
new StudentLoader(part2);
StudentLoader t3 =
new StudentLoader(part3);
t1.start();
t2.start();
t3.start();
t1.join();
t2.join();
t3.join();
ArrayList<Student> finalList =
new ArrayList<>();
finalList.addAll(t1.getStudents());
finalList.addAll(t2.getStudents());
finalList.addAll(t3.getStudents());
manager.addStudents(finalList);
System.out.println(
"Students loaded: "
+ finalList.size()
);
}
case 2 -> {
System.out.print("ID: ");
int id = scanner.nextInt();
System.out.println(manager.searchStudent(id));
Student student =
manager.searchStudent(id);
if(student != null){
System.out.println("Found:");
System.out.println(student);
}
else{
System.out.println("Student not found.");
}
}
case 3 -> {
System.out.print("ID: ");
int id = scanner.nextInt();
boolean removed = manager.removeStudent(id);
System.out.println(removed);
System.out.println(
manager.removeStudent(id)
);
}
case 4 ->
manager.printStudents();
case 4 -> {
manager.printStudents();
}
case 5 -> {
return;
}
}
}
src/main/java/dev/model/Student.java
+16 -24
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@@ -3,18 +3,11 @@ 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;
@@ -38,35 +31,35 @@ public class Student {
return gpa;
}
@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 (this == obj) {
return true;
}
// Step 2:
// Convert obj to Student
if (getClass() != obj.getClass()) {
return false;
}
// Step 3:
// Compare IDs
Student other = (Student) obj;
return false;
return id == other.id;
}
@Override
public String toString() {
@@ -77,5 +70,4 @@ public class Student {
", gpa=" + gpa +
'}';
}
}
src/main/java/dev/service/StudentManager.java
+25 -13
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@@ -4,46 +4,58 @@ 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
for (Student student : students) {
if (student.getId() == id) {
return student;
}
}
// Compare IDs
return null;
}
public boolean removeStudent(int id) {
// TODO:
// Find student
Student student = searchStudent(id);
if (student != null) {
students.remove(student);
return true;
}
// Remove student
return false;
}
public void printStudents() {
for (Student student : students) {
System.out.println(student);
src/main/java/dev/thread/StudentLoader.java
+20 -18
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@@ -1,56 +1,58 @@
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) {
// TODO:
// split line
// TODO:
// read values
String[] data = line.split(",");
// TODO:
// create Student
// TODO:
// add to students list
int id = Integer.parseInt(data[0]);
String name = data[1];
String major = data[2];
double gpa = Double.parseDouble(data[3]);
Student student =
new Student(id, name, major, gpa);
students.add(student);
}
}
public ArrayList<Student> getStudents() {
return students;
src/main/java/dev/utils/FileManager.java
+20 -5
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@@ -1,31 +1,46 @@
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 {
public static List<String> loadStudents(String path)
throws Exception {
List<String> lines = new ArrayList<>();
BufferedReader reader = new BufferedReader(new FileReader(path));
BufferedReader reader =
new BufferedReader(
new FileReader(path)
);
String line;
while ((line = reader.readLine()) != null) {
// TODO:
// Add line to list
if (!line.isEmpty()) {
lines.add(line);
}
}
reader.close();
return lines;
}
src/main/java/lecture/multithreading/basics/JoinSimpleExample.java
+1 -1
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@@ -25,7 +25,7 @@ public class JoinSimpleExample {
System.out.println("The main thread waits until the worker finishes...");
try {
worker.join(); // The main thread stops here until the worker finishes
worker.join();
} catch (InterruptedException e) {
e.printStackTrace();
}
src/main/java/lecture/multithreading/timeout/Main.java
+30 -4
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@@ -1,10 +1,36 @@
package lecture.multithreading.timeout;
public class Main {
public static void main(String[] args) {
// TODO
public static void main(String[] args) throws InterruptedException {
Thread worker = new Thread(new Runnable() {
@Override
public void run() {
System.out.println("👷 Worker started...");
try {
Thread.sleep(10000); // Runs for 10 seconds
} catch (InterruptedException e) {
System.out.println("🛑 Worker was interrupted!");
}
System.out.println("👷 Worker finished!");
}
});
worker.start();
System.out.println("Main: waiting max 3 seconds for worker...");
// join with timeout (in milliseconds)
worker.join(3000);
if (worker.isAlive()) {
System.out.println("⏰ Timeout reached! Worker is still running.");
System.out.println("Main: I'm not waiting anymore, continuing...");
} else {
System.out.println("Worker finished before timeout.");
}
System.out.println("Main thread continues its own work now.");
}
}