Java Threads

ขยายไวยากรณ์

public class Main extends Thread {
  public void run() {
    System.out.println("This code is running in a thread");
  }
}

ใช้ไวยากรณ์

public class Main implements Runnable {
  public void run() {
    System.out.println("This code is running in a thread");
  }
}

ขยายตัวอย่าง

public class Main extends Thread {
  public static void main(String[] args) {
    Main thread = new Main();
    thread.start();
    System.out.println("This code is outside of the thread");
  }
  public void run() {
    System.out.println("This code is running in a thread");
  }
}

ใช้ตัวอย่าง

public class Main implements Runnable {
  public static void main(String[] args) {
    Main obj = new Main();
    Thread thread = new Thread(obj);
    thread.start();
    System.out.println("This code is outside of the thread");
  }
  public void run() {
    System.out.println("This code is running in a thread");
  }
}

ตัวอย่าง

ตัวอย่างโค้ดที่ค่าของจำนวน ตัวแปร ไม่สามารถคาดเดาได้:

public class Main extends Thread {
  public static int amount = 0;

  public static void main(String[] args) {
    Main thread = new Main();
    thread.start();
    System.out.println(amount);
    amount++;
    System.out.println(amount);
  }

  public void run() {
    amount++;
  }
}

ตัวอย่าง

ใช้isAlive()เพื่อป้องกันปัญหาการทำงานพร้อมกัน:

public class Main extends Thread {
  public static int amount = 0;

  public static void main(String[] args) {
    Main thread = new Main();
    thread.start();
    // Wait for the thread to finish
    while(thread.isAlive()) {
    System.out.println("Waiting...");
  }
  // Update amount and print its value
  System.out.println("Main: " + amount);
  amount++;
  System.out.println("Main: " + amount);
  }
  public void run() {
    amount++;
  }
}