使用condition 实现线程顺序执行
书上给的例子都是ABCABC这种,比较简单,复杂点的如A0B0C0, A0A1A2没有,手动实现下,做个记录
1. A0 A1 A2 A3
1 public class Demo0 {
2
3 private static volatile int nextPrintWho = 0;
4
5 public static void main(String[] args) throws InterruptedException, NoSuchFieldException {
6 ReentrantLock lock = new ReentrantLock();
7 Condition condition = lock.newCondition();
8
9 Runnable runnable = ()-> {
10 lock.lock();
11 String name = Thread.currentThread().getName();
12 final int index = Integer.parseInt(name.substring(name.length() - 1, name.length()));
13 while (Demo0.nextPrintWho != index) {
14 try {
15 condition.await();
16 } catch (InterruptedException e) {
17 e.printStackTrace();
18 }
19 }
20 Demo0.nextPrintWho += 1;
21 println(Thread.currentThread().getName());
22 try {
23 condition.signAll();
24 }catch (Exception e) {
25 e.printStackTrace();
26 }finally {
27 if(lock.isHeldByCurrentThread()) {
28 lock.unlock();
29 }
30 }
31 };
32 int size = 5;
33 List<Thread> threadList = new ArrayList<>(size);
34 for(int i=0; i<size; i++) {
35 threadList.add(new Thread(runnable,"A" + i));
36 }
37 threadList.forEach(i->i.start());
38 }
39
40 private static void println(Object object) {
41 System.out.println(object);
42 }
43
44 }
2.单condition实现ABC ABC ABC
1 /**
2 * @author tele
3 * @Description 使用condition实现顺序启动线程 ABC ABC ABC
4 * @create 2019-12-24
5 */
6 public class Demo1 {
7
8 private static volatile int nextPrintWho = 1;
9
10 public static void main(String[] args) throws InterruptedException, NoSuchFieldException {
11 ReentrantLock lock = new ReentrantLock();
12 Condition condition = lock.newCondition();
13
14 Runnable runnableA = ()-> {
15 lock.lock();
16 while (Demo1.nextPrintWho != 1) {
17 try {
18 condition.await();
19 } catch (InterruptedException e) {
20 e.printStackTrace();
21 }
22 }
23 Demo1.nextPrintWho = 2;
24 println(Thread.currentThread().getName());
25 try {
26 condition.signAll();
27 }catch (Exception e) {
28 e.printStackTrace();
29 }finally {
30 if(lock.isHeldByCurrentThread()) {
31 lock.unlock();
32 }
33 }
34 };
35
36 Runnable runnableB = ()-> {
37 lock.lock();
38 while (Demo1.nextPrintWho != 2) {
39 try {
40 condition.await();
41 } catch (InterruptedException e) {
42 e.printStackTrace();
43 }
44 }
45 Demo1.nextPrintWho = 3;
46 println(Thread.currentThread().getName());
47 try {
48 condition.signal();
49 }catch (Exception e) {
50 e.printStackTrace();
51 }finally {
52 if(lock.isHeldByCurrentThread()) {
53 lock.unlock();
54 }
55 }
56 };
57
58
59 Runnable runnableC = ()-> {
60 lock.lock();
61 while (Demo1.nextPrintWho != 3) {
62 try {
63 condition.await();
64 } catch (InterruptedException e) {
65 e.printStackTrace();
66 }
67 }
68 Demo1.nextPrintWho = 1;
69 println(Thread.currentThread().getName());
70 try {
71 condition.signal();
72 }catch (Exception e) {
73 e.printStackTrace();
74 }finally {
75 if(lock.isHeldByCurrentThread()) {
76 lock.unlock();
77 }
78 }
79 };
80
81 for(int i=0; i<5; i++) {
82 new Thread(runnableA,"A").start();
83 new Thread(runnableB,"B").start();
84 new Thread(runnableC,"C").start();
85 }
86
87
88 }
89
90 private static void println(Object object) {
91 System.out.println(object);
92 }
93
94 }
3.多个condition实现ABC ABC
1 /**
2 * @author tele
3 * @Description 使用多个condition实现顺序启动线程 ABC ABC ABC
4 * @create 2019-12-24
5 */
6 public class Demo2 {
7
8 private static volatile int nextPrintWho = 1;
9
10 public static void main(String[] args) throws InterruptedException, NoSuchFieldException {
11 ReentrantLock lock = new ReentrantLock();
12 Condition conditionA = lock.newCondition();
13 Condition conditionB = lock.newCondition();
14 Condition conditionC = lock.newCondition();
15
16 Runnable runnableA = ()-> {
17 lock.lock();
18 while (Demo2.nextPrintWho != 1) {
19 try {
20 conditionA.await();
21 } catch (InterruptedException e) {
22 e.printStackTrace();
23 }
24 }
25 Demo2.nextPrintWho = 2;
26 println(Thread.currentThread().getName());
27 try {
28 conditionB.signal();
29 }catch (Exception e) {
30 e.printStackTrace();
31 }finally {
32 if(lock.isHeldByCurrentThread()) {
33 lock.unlock();
34 }
35 }
36 };
37
38 Runnable runnableB = ()-> {
39 lock.lock();
40 while (Demo2.nextPrintWho != 2) {
41 try {
42 conditionB.await();
43 } catch (InterruptedException e) {
44 e.printStackTrace();
45 }
46 }
47 Demo2.nextPrintWho = 3;
48 println(Thread.currentThread().getName());
49 try {
50 conditionC.signal();
51 }catch (Exception e) {
52 e.printStackTrace();
53 }finally {
54 if(lock.isHeldByCurrentThread()) {
55 lock.unlock();
56 }
57 }
58 };
59
60
61 Runnable runnableC = ()-> {
62 lock.lock();
63 while (Demo2.nextPrintWho != 3) {
64 try {
65 conditionC.await();
66 } catch (InterruptedException e) {
67 e.printStackTrace();
68 }
69 }
70 Demo2.nextPrintWho = 1;
71 println(Thread.currentThread().getName());
72 try {
73 conditionA.signal();
74 }catch (Exception e) {
75 e.printStackTrace();
76 }finally {
77 if(lock.isHeldByCurrentThread()) {
78 lock.unlock();
79 }
80 }
81 };
82
83 for(int i=0; i<5; i++) {
84 new Thread(runnableA,"A").start();
85 new Thread(runnableB,"B").start();
86 new Thread(runnableC,"C").start();
87 }
88
89
90 }
91
92 private static void println(Object object) {
93 System.out.println(object);
94 }
95
96 }
4.A0 B0 C0 A1 B1 C1 A2 B2 C2
1 /**
2 * @author tele
3 * @Description 使用condition实现顺序启动线程 A0 B0 C0 A1 B1 C1 A2 B2 C2
4 * @create 2019-12-24
5 */
6 public class Demo3 {
7
8 private static volatile int nextPrintWho = 0;
9
10 private static volatile int order = 1;
11
12 private static final int ORDER_A = 1;
13
14 private static final int ORDER_B = 2;
15
16 private static final int ORDER_C = 3;
17
18 public static void main(String[] args) throws InterruptedException, NoSuchFieldException {
19 ReentrantLock lock = new ReentrantLock();
20 Condition conditionA = lock.newCondition();
21 Condition conditionB = lock.newCondition();
22 Condition conditionC = lock.newCondition();
23
24 Runnable runnableA = ()-> {
25 lock.lock();
26 String name = Thread.currentThread().getName();
27
28 final int index = Integer.parseInt(name.substring(name.length() - 1, name.length()));
29
30 while (!name.contains("A") || Demo3.nextPrintWho != index || Demo3.order != Demo3.ORDER_A) {
31 try {
32 conditionA.await();
33 } catch (InterruptedException e) {
34 e.printStackTrace();
35 }
36 }
37
38 Demo3.order = Demo3.ORDER_B;
39 println(Thread.currentThread().getName());
40 try {
41 conditionB.signalAll();
42 }catch (Exception e) {
43 e.printStackTrace();
44 }finally {
45 if(lock.isHeldByCurrentThread()) {
46 lock.unlock();
47 }
48 }
49 };
50
51 Runnable runnableB = ()-> {
52 lock.lock();
53 String name = Thread.currentThread().getName();
54
55 final int index = Integer.parseInt(name.substring(name.length() - 1, name.length()));
56
57 while (!name.contains("B") || Demo3.nextPrintWho != index || Demo3.order != Demo3.ORDER_B) {
58 try {
59 conditionB.await();
60 } catch (InterruptedException e) {
61 e.printStackTrace();
62 }
63 }
64 Demo3.order = Demo3.ORDER_C;
65 println(Thread.currentThread().getName());
66 try {
67 conditionC.signalAll();
68 }catch (Exception e) {
69 e.printStackTrace();
70 }finally {
71 if(lock.isHeldByCurrentThread()) {
72 lock.unlock();
73 }
74 }
75 };
76
77
78 Runnable runnableC = ()-> {
79 lock.lock();
80 String name = Thread.currentThread().getName();
81 final int index = Integer.parseInt(name.substring(name.length() - 1, name.length()));
82 while (!name.contains("C") || Demo3.nextPrintWho != index || Demo3.order != Demo3.ORDER_C) {
83 try {
84 conditionC.await();
85 } catch (InterruptedException e) {
86 e.printStackTrace();
87 }
88 }
89 Demo3.nextPrintWho += 1;
90 Demo3.order = Demo3.ORDER_A;
91 println(Thread.currentThread().getName());
92 try {
93 conditionA.signalAll();
94 }catch (Exception e) {
95 e.printStackTrace();
96 }finally {
97 if(lock.isHeldByCurrentThread()) {
98 lock.unlock();
99 }
100 }
101 };
102
103 for(int i=0; i<5; i++) {
104 new Thread(runnableA,"A" + i).start();
105 new Thread(runnableB,"B" + i).start();
106 new Thread(runnableC,"C" + i).start();
107 }
108
109
110 }
111
112 private static void println(Object object) {
113 System.out.println(object);
114 }
115
116 }
5.A0 A1 A2 A3 B0 B1 B2 B3
1 /**
2 * @author tele
3 * @Description 使用condition实现顺序启动线程 A0 A1 A2 A3 B0 B1 B2 B3
4 * @create 2019-12-24
5 */
6 public class Demo4 {
7
8 private static volatile int nextPrintWho = 0;
9
10 private static volatile int order = 1;
11
12 private static final int LIST_SIZE = 5;
13
14 private static final int ORDER_A = 1;
15
16 private static final int ORDER_B = 2;
17
18 private static final int ORDER_C = 3;
19
20 public static void main(String[] args) throws InterruptedException, NoSuchFieldException {
21 ReentrantLock lock = new ReentrantLock();
22 Condition condition = lock.newCondition();
23 Runnable runnableA = ()-> {
24 lock.lock();
25 String name = Thread.currentThread().getName();
26
27 final int index = Integer.parseInt(name.substring(name.length() - 1, name.length()));
28
29 while (!name.contains("A") || Demo4.nextPrintWho != index || Demo4.order != Demo4.ORDER_A) {
30 try {
31 condition.await();
32 } catch (InterruptedException e) {
33 e.printStackTrace();
34 }
35 }
36 Demo4.nextPrintWho += 1;
37 if(Demo4.nextPrintWho == LIST_SIZE) {
38 Demo4.order = Demo4.ORDER_B;
39 Demo4.nextPrintWho = 0;
40 }
41 println(Thread.currentThread().getName());
42 try {
43 condition.signalAll();
44 }catch (Exception e) {
45 e.printStackTrace();
46 }finally {
47 if(lock.isHeldByCurrentThread()) {
48 lock.unlock();
49 }
50 }
51 };
52
53 Runnable runnableB = ()-> {
54 lock.lock();
55 String name = Thread.currentThread().getName();
56
57 final int index = Integer.parseInt(name.substring(name.length() - 1, name.length()));
58
59 while (!name.contains("B") || Demo4.nextPrintWho != index || Demo4.order != Demo4.ORDER_B) {
60 try {
61 condition.await();
62 } catch (InterruptedException e) {
63 e.printStackTrace();
64 }
65 }
66 Demo4.nextPrintWho += 1;
67 if(Demo4.nextPrintWho == LIST_SIZE) {
68 Demo4.order = Demo4.ORDER_C;
69 Demo4.nextPrintWho = 0;
70 }
71 println(Thread.currentThread().getName());
72 try {
73 condition.signalAll();
74 }catch (Exception e) {
75 e.printStackTrace();
76 }finally {
77 if(lock.isHeldByCurrentThread()) {
78 lock.unlock();
79 }
80 }
81 };
82
83 Runnable runnableC = ()-> {
84 lock.lock();
85 String name = Thread.currentThread().getName();
86 final int index = Integer.parseInt(name.substring(name.length() - 1, name.length()));
87 while (!name.contains("C") || Demo4.nextPrintWho != index || Demo4.order != Demo4.ORDER_C) {
88 try {
89 condition.await();
90 } catch (InterruptedException e) {
91 e.printStackTrace();
92 }
93 }
94 Demo4.order = Demo4.ORDER_C;
95 Demo4.nextPrintWho += 1;
96 println(Thread.currentThread().getName());
97 try {
98 condition.signalAll();
99 }catch (Exception e) {
100 e.printStackTrace();
101 }finally {
102 if(lock.isHeldByCurrentThread()) {
103 lock.unlock();
104 }
105 }
106 };
107
108 List<Thread> threadAList = new ArrayList<>(LIST_SIZE);
109 List<Thread> threadBList = new ArrayList<>(LIST_SIZE);
110 List<Thread> threadCList = new ArrayList<>(LIST_SIZE);
111
112 for(int i=0; i<LIST_SIZE; i++) {
113 threadAList.add(new Thread(runnableA,"A" + i));
114 threadBList.add(new Thread(runnableB,"B" + i));
115 threadCList.add(new Thread(runnableC,"C" + i));
116 }
117
118 threadAList.forEach(i->i.start());
119 threadBList.forEach(i->i.start());
120 threadCList.forEach(i->i.start());
121
122
123 }
124
125 private static void println(Object object) {
126 System.out.println(object);
127 }
128
129 }
