Microsoft007: Multi threading And priorityThread in java

✅ What is a Thread in Java?

A thread in Java is a lightweight sub-process — the smallest unit of execution. It allows multiple tasks to run concurrently within a program, sharing the same memory space.

Java threads are part of the java.lang.Thread class and can be used to:

Perform background tasks
Increase responsiveness
Utilize CPU more efficiently on multicore systems

✅ What is Multithreading?

Multithreading is the process of executing two or more threads concurrently within a single Java program. It enhances the performance of applications by utilizing CPU more efficiently and enabling tasks to run in parallel.

🔄 Characteristics:

Threads share the same memory.
Requires synchronization to avoid race conditions.
Helps in parallel execution and responsive applications.

✅ Real-world Uses of Multithreading in Projects

Use Case	Example
Web Servers	Handling multiple HTTP requests in parallel (Spring Boot, Tomcat)
Background Processing	Asynchronous email sending, file uploads, or logging
Batch Processing	Processing large files or DB records concurrently
UI Responsiveness	In desktop apps (Swing/JavaFX), long-running tasks run in background threads
Real-time Data Processing	Kafka consumers reading streams on separate threads
Microservices	Running parallel tasks (e.g., fetching user info from multiple services)

How many ways create threads in java 8

In Java 8, you can create threads in several ways. The most common approaches are:

1. Extending the `Thread` Class

You can create a thread by extending the `Thread` class and overriding its `run()` method.
class MyThread extends Thread {
public void run() {
System.out.println("Thread running...");
}
}
public class Main {
public static void main(String[] args) {
MyThread thread = new MyThread();
thread.start(); // Start the thread
}
}

2. Implementing the `Runnable` Interface

Implementing `Runnable` allows more flexibility since the class can still extend another class.
class MyRunnable implements Runnable {
public void run() {
System.out.println("Thread running...");
}
}
public class Main {
public static void main(String[] args) {
Thread thread = new Thread(new MyRunnable());
thread.start();
}
}

3. Using Lambda Expressions (Java 8 Feature)

Java 8 introduced lambda expressions, simplifying the `Runnable` implementation.
public class Main {
public static void main(String[] args) {
Thread thread = new Thread(() -> System.out.println("Thread running..."));
thread.start();
}
}

4. Using the `ExecutorService` (Thread Pool)

Java provides the `ExecutorService` framework to manage thread pools efficiently.
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class Main {
public static void main(String[] args) {
ExecutorService executor = Executors.newFixedThreadPool(2);
executor.submit(() -> System.out.println("Thread running..."));
executor.shutdown(); // Shutdown the executor
}
}

5. Using the `Callable` and `Future` Interface

If you need a return value from a thread, use `Callable` instead of `Runnable`.
import java.util.concurrent.*;
public class Main {
public static void main(String[] args) {
ExecutorService executor = Executors.newSingleThreadExecutor();
Callable<String> task = () -> {
Thread.sleep(2000); // Simulating a delay
return "Task completed!";
};
Future<String> future = executor.submit(task);
try {
System.out.println("Waiting for the result...");
String result = future.get(); // Blocks until the result is available
System.out.println("Result: " + result);
} catch (InterruptedException | ExecutionException e) {
e.printStackTrace();
} finally {
executor.shutdown(); // Properly shut down the executor
}
}
}

6. Using `CompletableFuture` (Java 8 Feature)

Java 8 introduced `CompletableFuture` for async programming.
import java.util.concurrent.CompletableFuture;
public class Main {
public static void main(String[] args) {
CompletableFuture.runAsync(() -> System.out.println("Thread running..."));
}
}
Each approach has its own use case, depending on whether you need a simple thread, a return value, or a managed thread pool.

✅ Code Recap (Quick Summary)

// 1. Thread class

new MyThread().start();

// 2. Runnable

new Thread(new MyRunnable()).start();

// 3. Lambda Runnable

new Thread(() -> System.out.println("Running")).start();

// 4. ExecutorService

ExecutorService pool = Executors.newFixedThreadPool(2);

pool.submit(() -> System.out.println("Pool thread"));

pool.shutdown();

// 5. Callable + Future

Future<String> future = Executors.newSingleThreadExecutor()

.submit(() -> "Result");

System.out.println(future.get());

// 6. CompletableFuture

CompletableFuture.runAsync(() -> System.out.println("Async thread"));

✅ Summary Table

Feature	Thread	Runnable	Executor	Callable	CompletableFuture
Return Value	❌	❌	❌/✅	✅	✅
Java 8 Friendly	❌	✅	✅	✅	✅
Use for Thread Pools	❌	✅	✅	✅	✅
Async Style	❌	❌	✅	✅	✅
Lambda Support	❌	✅	✅	✅	✅

Where to Use Multithreading in Your Spring Boot Project?

Multithreading is beneficial in various scenarios of a Spring Boot application:

1. Asynchronous Task Execution

Use @Async to run tasks in a separate thread.


import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

@Service
public class MyService {

    @Async
    public void performTask() {
        System.out.println("Executing in thread: " + Thread.currentThread().getName());
    }
}

✅ Use Case: Long-running operations like sending emails, file processing, or background jobs.

2. Parallel Processing in REST APIs

Use CompletableFuture to return responses without blocking.


import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
import java.util.concurrent.CompletableFuture;

@Service
public class MyService {

    @Async
    public CompletableFuture<String> getData() {
        return CompletableFuture.supplyAsync(() -> "Processing Data...");
    }
}

✅ Use Case: Fetching data from multiple sources (e.g., APIs, databases) in parallel.

3. Handling Multiple User Requests (Thread Pooling)

Spring Boot uses ExecutorService for thread pooling.


import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.concurrent.Executor;
import java.util.concurrent.Executors;

@Configuration
public class ThreadPoolConfig {

    @Bean
    public Executor taskExecutor() {
        return Executors.newFixedThreadPool(5); // 5 concurrent threads
    }
}

✅ Use Case: Optimizing performance for high-traffic APIs.

4. Multi-threaded Batch Processing (Spring Batch)

Spring Batch executes tasks in chunks using multiple threads.


import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.context.annotation.Configuration;

@Configuration
@EnableBatchProcessing
public class BatchConfig {
}

✅ Use Case: Large dataset processing, scheduled jobs, and ETL (Extract, Transform, Load) tasks.

5. Concurrent Database Operations

Using @Transactional with multithreading ensures data consistency.


import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

@Service
public class MyService {

    @Transactional
    public void updateDatabase() {
        // Perform database operations safely in a multithreaded environment
    }
}

✅ Use Case: Parallel processing of bulk database updates.

Conclusion

Multithreading is a vital concept in Java programming, enabling the concurrent execution of tasks to fully utilize system resources and improve application responsiveness. It plays a key role in:

🔄 Concurrency: Efficiently managing multiple tasks at the same time.
⚡ Parallelism: Taking advantage of multi-core processors for faster execution.
🚀 Responsiveness: Ensuring that applications remain smooth and non-blocking during long-running operations.

In high-performance Java applications, multithreading is essential for:

Optimizing resource utilization
Enhancing throughput and scalability
Supporting real-time and asynchronous processing

In modern Spring Boot projects, multithreading is widely applied for:

Handling multiple HTTP requests concurrently
Running background tasks (e.g., email sending, data processing)
Performing parallel database operations to reduce latency

By using Java’s threading tools—such as Thread, Runnable, ExecutorService, Callable, and CompletableFuture—developers can write more efficient, robust, and scalable applications.

In Java, thread priorities determine the relative importance of threads, helping the thread scheduler decide which thread to run first when multiple threads are eligible.

2) Thread Priority in Java

Every thread in Java has a priority, an integer between 1 (MIN_PRIORITY) and 10 (MAX_PRIORITY).
The default priority is 5 (NORM_PRIORITY).

🔢 Priority Constants in `Thread` class:

public static final int MIN_PRIORITY = 1;
public static final int NORM_PRIORITY = 5;
public static final int MAX_PRIORITY = 10;

🔧 Setting and Getting Priority:

Thread t = new Thread();
t.setPriority(Thread.MAX_PRIORITY); // Set to 10
int p = t.getPriority();            // Get priority

⚙️ Example with Priority:

class PriorityThread extends Thread {
    public void run() {
        System.out.println(Thread.currentThread().getName() + " with priority " + getPriority());
    }
}

public class Main {
    public static void main(String[] args) {
        PriorityThread t1 = new PriorityThread();
        PriorityThread t2 = new PriorityThread();
        PriorityThread t3 = new PriorityThread();

        t1.setPriority(Thread.MIN_PRIORITY);   // 1
        t2.setPriority(Thread.NORM_PRIORITY);  // 5
        t3.setPriority(Thread.MAX_PRIORITY);   // 10

        t1.setName("Low Priority");
        t2.setName("Normal Priority");
        t3.setName("High Priority");

        t1.start();
        t2.start();
        t3.start();
    }
}

🧠 Output (order is not guaranteed):

Low Priority with priority 1
High Priority with priority 10
Normal Priority with priority 5

The JVM thread scheduler behavior depends on the OS. Java thread priority is a hint, not a strict rule. Don't rely on it for correctness in production code.

🔒 Summary:

Feature	Value
Range	1 to 10
Default Priority	5 (`NORM_PRIORITY`)
Used for	Thread scheduling hints
OS-dependent	✅ Yes

Thursday, 12 June 2025

Multi threading And priorityThread in java

✅ What is Multithreading?

🔄 Characteristics:

✅ Real-world Uses of Multithreading in Projects

How many ways create threads in java 8

In Java 8, you can create threads in several ways. The most common approaches are:

1. Extending the `Thread` Class

2. Implementing the `Runnable` Interface

3. Using Lambda Expressions (Java 8 Feature)

Java 8 introduced lambda expressions, simplifying the `Runnable` implementation.
public class Main {
public static void main(String[] args) {
Thread thread = new Thread(() -> System.out.println("Thread running..."));
thread.start();
}
}

4. Using the `ExecutorService` (Thread Pool)

5. Using the `Callable` and `Future` Interface

6. Using `CompletableFuture` (Java 8 Feature)

✅ Summary Table

Where to Use Multithreading in Your Spring Boot Project?

1. Asynchronous Task Execution

2. Parallel Processing in REST APIs

3. Handling Multiple User Requests (Thread Pooling)

4. Multi-threaded Batch Processing (Spring Batch)

5. Concurrent Database Operations

Conclusion

2) Thread Priority in Java

🔢 Priority Constants in `Thread` class:

🔧 Setting and Getting Priority:

⚙️ Example with Priority:

🧠 Output (order is not guaranteed):

🔒 Summary:

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Thursday, 12 June 2025

Multi threading And priorityThread in java

✅ What is Multithreading?

🔄 Characteristics:

✅ Real-world Uses of Multithreading in Projects

How many ways create threads in java 8In Java 8, you can create threads in several ways. The most common approaches are:

1. Extending the Thread Class

2. Implementing the Runnable Interface

3. Using Lambda Expressions (Java 8 Feature)

Java 8 introduced lambda expressions, simplifying the Runnable implementation.public class Main { public static void main(String[] args) { Thread thread = new Thread(() -> System.out.println("Thread running...")); thread.start(); }}

4. Using the ExecutorService (Thread Pool)

5. Using the Callable and Future Interface

6. Using CompletableFuture (Java 8 Feature)

✅ Summary Table

Where to Use Multithreading in Your Spring Boot Project?

1. Asynchronous Task Execution

2. Parallel Processing in REST APIs

3. Handling Multiple User Requests (Thread Pooling)

4. Multi-threaded Batch Processing (Spring Batch)

5. Concurrent Database Operations

Conclusion

2) Thread Priority in Java

🔢 Priority Constants in Thread class:

🔧 Setting and Getting Priority:

⚙️ Example with Priority:

🧠 Output (order is not guaranteed):

🔒 Summary:

No comments:

Post a Comment

How many ways create threads in java 8

In Java 8, you can create threads in several ways. The most common approaches are:

1. Extending the `Thread` Class

2. Implementing the `Runnable` Interface

Java 8 introduced lambda expressions, simplifying the `Runnable` implementation.
public class Main {
public static void main(String[] args) {
Thread thread = new Thread(() -> System.out.println("Thread running..."));
thread.start();
}
}

4. Using the `ExecutorService` (Thread Pool)

5. Using the `Callable` and `Future` Interface

6. Using `CompletableFuture` (Java 8 Feature)

🔢 Priority Constants in `Thread` class: