線程的優先級初步嘗試

線程的優先級

   //最小優先級
   public final static int MIN_PRIORITY = 1;
   //正常優先級
   public final static int NORM_PRIORITY = 5;
   //最大優先級
   public final static int MAX_PRIORITY = 10;

優先級可以繼承，A線程啓動B線程，則B線程的優先級和A一樣

MyThread1類

public class MyThread1 extends Thread{

	@Override
	public void run() {
		System.out.println("MyThread1 run priority=" + this.getPriority());
		MyThread2 thread2 = new MyThread2();
		thread2.start();
	}
	
	
}

MyThread2類

public class MyThread2 extends Thread{

	@Override
	public void run() {
		System.out.println("MyThread2 run priority=" + this.getPriority());
	}
	
	
}

Run類

public class Run {
	
	public static void main(String[] args) {

		
		System.out.println("main thread begin priority=" + Thread.currentThread().getPriority());
		
		System.out.println("main thread end priority=" + Thread.currentThread().getPriority());
		
		MyThread1 thread1 = new MyThread1();
		thread1.setPriority(6);
		thread1.start();
	}
	
}

運行結果

main thread begin priority=5
main thread end priority=5
MyThread1 run priority=6
MyThread2 run priority=6

修改下run類代碼

public class Run {
	
	public static void main(String[] args) {

		
		System.out.println("main thread begin priority=" + Thread.currentThread().getPriority());
		
		Thread.currentThread().setPriority(6);
		System.out.println("main thread end priority=" + Thread.currentThread().getPriority());
		
		MyThread1 thread1 = new MyThread1();
		thread1.start();
	}
	
}

運行結果：

main thread begin priority=5
main thread end priority=6
MyThread1 run priority=6
MyThread2 run priority=6

//注：之前的run類中是thread.setPriority(6);   結果thread1和thread2中的優先級都是6

          之後的run類中是Thread.currentThread().setPriority(6);  相當把Main線程的優先級置成6了，所有後面的優先級也就都是6