Creating Threads

class PrintNumbers extends Thread { private int start, end; PrintNumbers(int start, int end) { this.start = start; this.end = end; } @Override public void run() { for (int i = start; i <= end; i++) { System.out.println(getName() + ": " + i); } } } PrintNumbers t1 = new PrintNumbers(1, 5); PrintNumbers t2 = new PrintNumbers(6, 10); t1.setName("Thread-1"); t2.setName("Thread-2"); t1.start(); t2.start();

Thread t = new Thread(() -> { for (int i = 1; i <= 5; i++) System.out.println("Lambda thread: " + i); }, "LambdaThread"); t.start();

import java.util.concurrent.*; Callable<Integer> task = () -> { int sum = 0; for (int i = 1; i <= 100; i++) sum += i; return sum; }; FutureTask<Integer> future = new FutureTask<>(task); Thread t = new Thread(future); t.start(); int result = future.get(); // Blocking, wait for result System.out.println("Sum: " + result); // 5050

ExecutorService executor = Executors.newFixedThreadPool(3); for (int i = 0; i < 5; i++) { final int taskId = i; executor.submit(() -> System.out.println("Task " + taskId + " by " + Thread.currentThread().getName())); } executor.shutdown();