今天看了看Java并發(fā)程序，寫一寫入門程序，并設(shè)置了線程的優(yōu)先級。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
|
class Elem implements Runnable{ public static int id = 0; private int cutDown = 5; private int priority; public void setPriority(int priority){ this.priority = priority; } public int getPriority(){ return this.priority; } public void run(){ Thread.currentThread().setPriority(priority); int threadId = id++; while(cutDown-- > 0){ double d = 1.2; while(d < 10000) d = d + (Math.E + Math.PI)/d; System.out.println("#" + threadId + "(" + cutDown + ")"); } }}public class Basic { public static void main(String args[]){ for(int i = 0; i < 10; i++){ Elem e = new Elem(); if(i == 0 ) e.setPriority(Thread.MAX_PRIORITY); else e.setPriority(Thread.MIN_PRIORITY); Thread t = new Thread(e); t.start(); } }} |
由于機器很強悍，所以先開始并沒看到并發(fā)的效果，感覺是按順序執(zhí)行的，所以在中間加了浮點數(shù)的運算來延遲時間。
當(dāng)然，main函數(shù)里面可以用Executors來管理線程。
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
import java.util.concurrent.*;class Elem implements Runnable{ public static int id = 0; private int cutDown = 5; private int priority; public void setPriority(int priority){ this.priority = priority; } public int getPriority(){ return this.priority; } public void run(){ Thread.currentThread().setPriority(priority); int threadId = id++; while(cutDown-- > 0){ double d = 1.2; while(d < 10000) d = d + (Math.E + Math.PI)/d; System.out.println("#" + threadId + "(" + cutDown + ")"); } }}public class Basic { public static void main(String args[]){// for(int i = 0; i < 10; i++){// Elem e = new Elem();// if(i == 0 )// e.setPriority(Thread.MAX_PRIORITY);// else// e.setPriority(Thread.MIN_PRIORITY);// Thread t = new Thread(e);// t.start();// } ExecutorService exec = Executors.newCachedThreadPool(); for(int i = 0; i < 10; i++){ Elem e = new Elem(); if(i == 0 ) e.setPriority(Thread.MAX_PRIORITY); else e.setPriority(Thread.MIN_PRIORITY); exec.execute(e); } exec.shutdown(); }} |
