Java中线程优先级的重要性?

在多线程应用程序中,每个线程都分配有一个优先级。线程调度程序根据线程的优先级将处理器分配给该线程,即,优先级最高的线程首先分配给处理器,依此类推。值为' 5'的线程的默认优先级。我们可以使用Thread类的getPriority() 方法获得线程的优先级。

Thread类中为线程优先级定义的三个静态值

MAX_PRIORITY

这是最大线程优先级,值为10

NORM_PRIORITY

这是默认的线程优先级,值为5

MIN_PRIORITY

这是最小线程优先级,值为1

语法

public final int getPriority()

示例

public class ThreadPriorityTest extends Thread {
   public static void main(String[]args) {
      ThreadPriorityTest thread1 = new ThreadPriorityTest();
      ThreadPriorityTest thread2 = new ThreadPriorityTest();
      ThreadPriorityTest thread3 = new ThreadPriorityTest();
      System.out.println("Default thread priority of thread1: " + thread1.getPriority());
      System.out.println("Default thread priority of thread2: " + thread2.getPriority());
      System.out.println("Default thread priority of thread3: " + thread3.getPriority());
      thread1.setPriority(8);
      thread2.setPriority(3);
      thread3.setPriority(6);
      System.out.println("New thread priority of thread1: " + thread1.getPriority());
      System.out.println("New thread priority of thread2: " + thread2.getPriority());
      System.out.println("New thread priority of thread3: " + thread3.getPriority());
   }
}

输出结果

Default thread priority of thread1: 5
Default thread priority of thread2: 5
Default thread priority of thread3: 5
New thread priority of thread1: 8
New thread priority of thread2: 3
New thread priority of thread3: 6