可以通过实现Runnable接口并覆盖该run()方法来创建线程。然后可以创建一个Thread对象并start()调用该方法。
线程优先级确定何时向线程提供处理器以及其他资源。可以使用setPriority()Thread类的方法进行更改。
给出了一个演示如何使用setPriority()Java中的方法更改线程优先级的程序，如下所示：
public class ThreadDemo extends Thread {
public void run() {
System.out.println("Running...");
}
public static void main(String[] args) {
ThreadDemo thread1 = new ThreadDemo();
ThreadDemo thread2 = new ThreadDemo();
ThreadDemo thread3 = new ThreadDemo();
ThreadDemo thread4 = new ThreadDemo();
ThreadDemo thread5 = new ThreadDemo();
System.out.println("Default thread priority of Thread 1: " + thread1.getPriority());
System.out.println("Default thread priority of Thread 2: " + thread2.getPriority());
System.out.println("Default thread priority of Thread 3: " + thread3.getPriority());
System.out.println("Default thread priority of Thread 4: " + thread4.getPriority());
System.out.println("Default thread priority of Thread 5: " + thread5.getPriority());
System.out.println("\nChanging the default thread priority using the setPriority() method");
thread1.setPriority(7);
thread2.setPriority(3);
thread3.setPriority(9);
thread4.setPriority(2);
thread5.setPriority(8);
System.out.println("\nChanged thread priority of Thread 1: " + thread1.getPriority());
System.out.println("Changed thread priority of Thread 2: " + thread2.getPriority());
System.out.println("Changed thread priority of Thread 3: " + thread3.getPriority());
System.out.println("Changed thread priority of Thread 4: " + thread4.getPriority());
System.out.println("Changed thread priority of Thread 5: " + thread5.getPriority());
System.out.println("\n" + Thread.currentThread().getName());
System.out.println("\nDefault thread priority of Main Thread: " + Thread.currentThread().getPriority());
Thread.currentThread().setPriority(10);
System.out.println("Changed thread priority of Main Thread: " + Thread.currentThread().getPriority());
}
}输出结果
Default thread priority of Thread 1: 5 Default thread priority of Thread 2: 5 Default thread priority of Thread 3: 5 Default thread priority of Thread 4: 5 Default thread priority of Thread 5: 5 Changing the default thread priority using the setPriority() method Changed thread priority of Thread 1: 7 Changed thread priority of Thread 2: 3 Changed thread priority of Thread 3: 9 Changed thread priority of Thread 4: 2 Changed thread priority of Thread 5: 8 main Default thread priority of Main Thread: 5 Changed thread priority of Main Thread: 10