More practice for multi-thread in java (join)

1. join:

class test2{
public static void main(String[] args){
System.out.println(“Hello test2”);
bThread thread1 = new bThread();
bThread thread2 = new bThread();
bThread thread3 = new bThread();
bThread thread4 = new bThread();
Thread thread1b = new Thread(thread1);
Thread thread2b = new Thread(thread2);
Thread thread3b = new Thread(thread3);
Thread thread4b = new Thread(thread4);

thread1b.start();
thread2b.start();
thread3b.start();
thread4b.start();
        System.out.println(“Thread count: “+ Thread.activeCount());
        
        try{
            thread1b.join(); //wait for thread1 join main thread
            System.out.println(thread1b +” join ~~~~~~”);
            thread2b.join();
            System.out.println(thread2b +” join ~~~~~~”);
            thread3b.join();
            System.out.println(thread3b +” join ~~~~~~”);
            thread4b.join();
            System.out.println(thread4b +” join ~~~~~~”);
            
        }catch(InterruptedException e){
            System.out.println(“join error”);
        }

System.out.println(“Thread count: “+ Thread.activeCount());
}
}

class bThread implements Runnable{
public void run(){
for(int i=0; i<100; i++){
String threadName = Thread.currentThread().getName();
System.out.println(threadName+ “: “+ i);
        }
}
public bThread(){
System.out.println(“This is bThread!”);
}

}


執行結果:

herongsendeMacBook-Air:160704-multithread RongSonHo$ java test2
Hello test2
This is bThread!
This is bThread!
This is bThread!
This is bThread!
Thread-0: 0
Thread count: 5
Thread-3: 0
Thread-2: 0
Thread-1: 0
Thread-1: 1
Thread-1: 2
Thread-2: 1
Thread-3: 1
Thread-0: 1
Thread-3: 2
Thread-2: 2
Thread-1: 3
Thread-2: 3
Thread-3: 3
Thread-0: 2
Thread-3: 4
Thread-2: 4
Thread-2: 5
Thread-2: 6
Thread-1: 4
Thread-2: 7
Thread-3: 5
Thread-0: 3
Thread-3: 6
Thread-2: 8
Thread-1: 5
Thread-2: 9
Thread-3: 7
Thread-0: 4
Thread-3: 8
Thread-2: 10
Thread-1: 6
Thread-2: 11
Thread-3: 9
Thread-0: 5
Thread-3: 10
Thread-2: 12
Thread-1: 7
Thread-2: 13
Thread-3: 11
Thread-0: 6
Thread-3: 12
Thread-2: 14
Thread-1: 8
Thread-2: 15
Thread-2: 16
Thread-3: 13
Thread-0: 7
Thread-3: 14
Thread-2: 17
Thread-1: 9
Thread-2: 18
Thread-3: 15
Thread-0: 8
Thread-3: 16
Thread-2: 19
Thread-1: 10
Thread-1: 11
Thread-1: 12
Thread-2: 20
Thread-3: 17
Thread-0: 9
Thread-3: 18
Thread-2: 21
Thread-1: 13
Thread-2: 22
Thread-3: 19
Thread-0: 10
Thread-3: 20
Thread-2: 23
Thread-1: 14
Thread-2: 24
Thread-3: 21
Thread-0: 11
Thread-3: 22
Thread-2: 25
Thread-1: 15
Thread-2: 26
Thread-3: 23
Thread-0: 12
Thread-3: 24
Thread-2: 27
Thread-1: 16
Thread-2: 28
Thread-3: 25
Thread-0: 13
Thread-3: 26
Thread-2: 29
Thread-1: 17
Thread-2: 30
Thread-3: 27
Thread-0: 14
Thread-0: 15
Thread-0: 16
Thread-3: 28
Thread-2: 31
Thread-1: 18
Thread-2: 32
Thread-3: 29
Thread-0: 17
Thread-0: 18
Thread-3: 30
Thread-2: 33
Thread-1: 19
Thread-2: 34
Thread-3: 31
Thread-0: 19
Thread-3: 32
Thread-2: 35
Thread-1: 20
Thread-2: 36
Thread-3: 33
Thread-0: 20
Thread-3: 34
Thread-2: 37
Thread-1: 21
Thread-2: 38
Thread-3: 35
Thread-0: 21
Thread-3: 36
Thread-2: 39
Thread-1: 22
Thread-2: 40
Thread-3: 37
Thread-0: 22
Thread-3: 38
Thread-2: 41
Thread-1: 23
Thread-2: 42
Thread-3: 39
Thread-0: 23
Thread-3: 40
Thread-2: 43
Thread-1: 24
Thread-2: 44
Thread-2: 45
Thread-3: 41
Thread-0: 24
Thread-3: 42
Thread-3: 43
Thread-3: 44
Thread-2: 46
Thread-1: 25
Thread-2: 47
Thread-2: 48
Thread-3: 45
Thread-0: 25
Thread-3: 46
Thread-2: 49
Thread-1: 26
Thread-2: 50
Thread-3: 47
Thread-0: 26
Thread-3: 48
Thread-2: 51
Thread-1: 27
Thread-2: 52
Thread-3: 49
Thread-0: 27
Thread-3: 50
Thread-2: 53
Thread-1: 28
Thread-1: 29
Thread-2: 54
Thread-3: 51
Thread-0: 28
Thread-3: 52
Thread-2: 55
Thread-1: 30
Thread-2: 56
Thread-3: 53
Thread-0: 29
Thread-0: 30
Thread-3: 54
Thread-2: 57
Thread-1: 31
Thread-2: 58
Thread-3: 55
Thread-0: 31
Thread-3: 56
Thread-2: 59
Thread-1: 32
Thread-2: 60
Thread-3: 57
Thread-0: 32
Thread-3: 58
Thread-2: 61
Thread-1: 33
Thread-2: 62
Thread-3: 59
Thread-0: 33
Thread-3: 60
Thread-2: 63
Thread-1: 34
Thread-2: 64
Thread-2: 65
Thread-3: 61
Thread-0: 34
Thread-3: 62
Thread-2: 66
Thread-1: 35
Thread-2: 67
Thread-2: 68
Thread-3: 63
Thread-0: 35
Thread-3: 64
Thread-2: 69
Thread-1: 36
Thread-1: 37
Thread-2: 70
Thread-3: 65
Thread-3: 66
Thread-3: 67
Thread-3: 68
Thread-0: 36
Thread-3: 69
Thread-2: 71
Thread-1: 38
Thread-2: 72
Thread-3: 70
Thread-0: 37
Thread-3: 71
Thread-3: 72
Thread-3: 73
Thread-2: 73
Thread-1: 39
Thread-2: 74
Thread-3: 74
Thread-0: 38
Thread-3: 75
Thread-2: 75
Thread-1: 40
Thread-2: 76
Thread-3: 76
Thread-3: 77
Thread-0: 39
Thread-3: 78
Thread-2: 77
Thread-1: 41
Thread-1: 42
Thread-2: 78
Thread-3: 79
Thread-0: 40
Thread-3: 80
Thread-2: 79
Thread-1: 43
Thread-2: 80
Thread-3: 81
Thread-3: 82
Thread-0: 41
Thread-3: 83
Thread-2: 81
Thread-1: 44
Thread-2: 82
Thread-3: 84
Thread-0: 42
Thread-3: 85
Thread-2: 83
Thread-1: 45
Thread-2: 84
Thread-3: 86
Thread-0: 43
Thread-3: 87
Thread-2: 85
Thread-1: 46
Thread-2: 86
Thread-3: 88
Thread-0: 44
Thread-3: 89
Thread-2: 87
Thread-1: 47
Thread-2: 88
Thread-3: 90
Thread-0: 45
Thread-3: 91
Thread-2: 89
Thread-1: 48
Thread-1: 49
Thread-1: 50
Thread-2: 90
Thread-3: 92
Thread-0: 46
Thread-3: 93
Thread-2: 91
Thread-1: 51
Thread-1: 52
Thread-2: 92
Thread-3: 94
Thread-0: 47
Thread-3: 95
Thread-2: 93
Thread-1: 53
Thread-2: 94
Thread-3: 96
Thread-0: 48
Thread-3: 97
Thread-0: 49
Thread-2: 95
Thread-1: 54
Thread-2: 96
Thread-0: 50
Thread-3: 98
Thread-0: 51
Thread-2: 97
Thread-1: 55
Thread-1: 56
Thread-2: 98
Thread-0: 52
Thread-3: 99
Thread-0: 53
Thread-0: 54
Thread-2: 99
Thread-1: 57
Thread-0: 55
Thread-0: 56
Thread-1: 58
Thread-0: 57
Thread-0: 58
Thread-1: 59
Thread-0: 59
Thread-0: 60
Thread-0: 61
Thread-1: 60
Thread-0: 62
Thread-0: 63
Thread-0: 64
Thread-1: 61
Thread-1: 62
Thread-0: 65
Thread-0: 66
Thread-0: 67
Thread-1: 63
Thread-0: 68
Thread-1: 64
Thread-0: 69
Thread-0: 70
Thread-1: 65
Thread-1: 66
Thread-0: 71
Thread-1: 67
Thread-0: 72
Thread-0: 73
Thread-1: 68
Thread-0: 74
Thread-1: 69
Thread-0: 75
Thread-1: 70
Thread-1: 71
Thread-0: 76
Thread-1: 72
Thread-0: 77
Thread-0: 78
Thread-0: 79
Thread-1: 73
Thread-0: 80
Thread-1: 74
Thread-1: 75
Thread-1: 76
Thread-0: 81
Thread-1: 77
Thread-0: 82
Thread-0: 83
Thread-1: 78
Thread-0: 84
Thread-1: 79
Thread-0: 85
Thread-0: 86
Thread-1: 80
Thread-0: 87
Thread-1: 81
Thread-1: 82
Thread-0: 88
Thread-0: 89
Thread-1: 83
Thread-0: 90
Thread-1: 84
Thread-1: 85
Thread-0: 91
Thread-1: 86
Thread-0: 92
Thread-1: 87
Thread-1: 88
Thread-0: 93
Thread-1: 89
Thread-1: 90
Thread-1: 91
Thread-0: 94
Thread-0: 95
Thread-1: 92
Thread-0: 96
Thread-0: 97
Thread-0: 98
Thread-1: 93
Thread-0: 99
Thread-1: 94
Thread-1: 95
Thread[Thread-0,5,] join ~~~~~~
Thread-1: 96
Thread-1: 97
Thread-1: 98
Thread-1: 99
Thread[Thread-1,5,] join ~~~~~~
Thread[Thread-2,5,] join ~~~~~~
Thread[Thread-3,5,] join ~~~~~~
Thread count: 1

———————


herongsendeMacBook-Air:160704-multithread RongSonHo$ java test2
Hello test2
This is bThread!
This is bThread!
This is bThread!
This is bThread!
Thread-0: 0
Thread-0: 1
Thread-1: 0
Thread-1: 1
Thread-2: 0
Thread-0: 2
Thread-2: 1
Thread-2: 2
Thread-1: 2
Thread-1: 3
Thread-3: 0
Thread-2: 3
Thread-0: 3
Thread-2: 4
Thread-3: 1
Thread-1: 4
Thread-3: 2
Thread-2: 5
Thread-0: 4
Thread-2: 6
Thread-3: 3
Thread-1: 5
Thread-3: 4
Thread-2: 7
Thread-0: 5
Thread-2: 8
Thread-3: 5
Thread-1: 6
Thread-3: 6
Thread-2: 9
Thread-0: 6
Thread-2: 10
Thread-3: 7
Thread-1: 7
Thread-3: 8
Thread-2: 11
Thread-0: 7
Thread-2: 12
Thread-3: 9
Thread-1: 8
Thread-3: 10
Thread-2: 13
Thread-0: 8
Thread-2: 14
Thread-3: 11
Thread-1: 9
Thread-3: 12
Thread-2: 15
Thread-0: 9
Thread-2: 16
Thread-3: 13
Thread-1: 10
Thread-3: 14
Thread-2: 17
Thread-2: 18
Thread-0: 10
Thread-2: 19
Thread-2: 20
Thread-3: 15
Thread-1: 11
Thread-3: 16
Thread-2: 21
Thread-0: 11
Thread-2: 22
Thread-2: 23
Thread-2: 24
Thread-2: 25
Thread-3: 17
Thread-3: 18
Thread-3: 19
Thread-3: 20
Thread-3: 21
Thread-3: 22
Thread-1: 12
Thread-3: 23
Thread-2: 26
Thread-0: 12
Thread-2: 27
Thread-3: 24
Thread-1: 13
Thread-3: 25
Thread-2: 28
Thread-0: 13
Thread-2: 29
Thread-3: 26
Thread-1: 14
Thread-3: 27
Thread-2: 30
Thread-0: 14
Thread-2: 31
Thread-3: 28
Thread-1: 15
Thread-3: 29
Thread-3: 30
Thread-2: 32
Thread-0: 15
Thread-2: 33
Thread-3: 31
Thread-1: 16
Thread-3: 32
Thread-2: 34
Thread-0: 16
Thread-2: 35
Thread-3: 33
Thread-1: 17
Thread-3: 34
Thread-2: 36
Thread-0: 17
Thread-0: 18
Thread-2: 37
Thread-3: 35
Thread-1: 18
Thread-3: 36
Thread-2: 38
Thread-0: 19
Thread-2: 39
Thread-2: 40
Thread-3: 37
Thread-1: 19
Thread-3: 38
Thread-3: 39
Thread-2: 41
Thread-0: 20
Thread-2: 42
Thread-3: 40
Thread-1: 20
Thread-3: 41
Thread-3: 42
Thread-2: 43
Thread-0: 21
Thread-2: 44
Thread-3: 43
Thread-1: 21
Thread-3: 44
Thread-2: 45
Thread-0: 22
Thread-2: 46
Thread-3: 45
Thread-1: 22
Thread-3: 46
Thread-2: 47
Thread-0: 23
Thread-2: 48
Thread-3: 47
Thread-3: 48
Thread-1: 23
Thread-1: 24
Thread-3: 49
Thread-2: 49
Thread-0: 24
Thread-2: 50
Thread-3: 50
Thread-1: 25
Thread-3: 51
Thread-2: 51
Thread-0: 25
Thread-2: 52
Thread-3: 52
Thread-1: 26
Thread-3: 53
Thread-2: 53
Thread-0: 26
Thread-2: 54
Thread-3: 54
Thread-1: 27
Thread-3: 55
Thread-2: 55
Thread-0: 27
Thread-2: 56
Thread-3: 56
Thread-1: 28
Thread-3: 57
Thread-2: 57
Thread-0: 28
Thread-0: 29
Thread-2: 58
Thread-3: 58
Thread-1: 29
Thread-3: 59
Thread-3: 60
Thread-2: 59
Thread-0: 30
Thread-2: 60
Thread-2: 61
Thread-3: 61
Thread-1: 30
Thread-1: 31
Thread-3: 62
Thread-3: 63
Thread-2: 62
Thread-0: 31
Thread-0: 32
Thread-2: 63
Thread-3: 64
Thread-1: 32
Thread-3: 65
Thread-2: 64
Thread-0: 33
Thread-2: 65
Thread-2: 66
Thread-3: 66
Thread-1: 33
Thread-1: 34
Thread-3: 67
Thread-2: 67
Thread-0: 34
Thread-2: 68
Thread-3: 68
Thread-3: 69
Thread-1: 35
Thread-1: 36
Thread-3: 70
Thread-2: 69
Thread-0: 35
Thread-2: 70
Thread-3: 71
Thread-1: 37
Thread-3: 72
Thread-2: 71
Thread-0: 36
Thread-2: 72
Thread-3: 73
Thread-1: 38
Thread-3: 74
Thread-3: 75
Thread-2: 73
Thread-0: 37
Thread-2: 74
Thread-3: 76
Thread-1: 39
Thread-3: 77
Thread-2: 75
Thread-0: 38
Thread-0: 39
Thread-2: 76
Thread-3: 78
Thread-3: 79
Thread-1: 40
Thread-3: 80
Thread-3: 81
Thread-2: 77
Thread-0: 40
Thread-2: 78
Thread-3: 82
Thread-1: 41
Thread-1: 42
Thread-1: 43
Thread-3: 83
Thread-2: 79
Thread-0: 41
Thread-2: 80
Thread-3: 84
Thread-1: 44
Thread-3: 85
Thread-2: 81
Thread-0: 42
Thread-2: 82
Thread-3: 86
Thread-1: 45
Thread-3: 87
Thread-2: 83
Thread-0: 43
Thread-2: 84
Thread-3: 88
Thread-1: 46
Thread-3: 89
Thread-2: 85
Thread-0: 44
Thread-0: 45
Thread-2: 86
Thread-3: 90
Thread-1: 47
Thread-3: 91
Thread-2: 87
Thread-0: 46
Thread-2: 88
Thread-3: 92
Thread-1: 48
Thread-3: 93
Thread-2: 89
Thread-0: 47
Thread-2: 90
Thread-3: 94
Thread-1: 49
Thread-3: 95
Thread-2: 91
Thread-0: 48
Thread-0: 49
Thread-2: 92
Thread-3: 96
Thread-1: 50
Thread-1: 51
Thread-3: 97
Thread-2: 93
Thread-0: 50
Thread-2: 94
Thread-3: 98
Thread-1: 52
Thread-3: 99
Thread-2: 95
Thread-0: 51
Thread-2: 96
Thread-1: 53
Thread-2: 97
Thread-0: 52
Thread-2: 98
Thread-1: 54
Thread-2: 99
Thread-0: 53
Thread-1: 55
Thread-1: 56
Thread-0: 54
Thread-0: 55
Thread-1: 57
Thread-0: 56
Thread-0: 57
Thread-1: 58
Thread-0: 58
Thread-1: 59
Thread-0: 59
Thread-1: 60
Thread-1: 61
Thread-0: 60
Thread-1: 62
Thread-0: 61
Thread-0: 62
Thread-1: 63
Thread-0: 63
Thread-0: 64
Thread-1: 64
Thread-0: 65
Thread-1: 65
Thread-0: 66
Thread-0: 67
Thread-1: 66
Thread-0: 68
Thread-1: 67
Thread-0: 69
Thread-1: 68
Thread-0: 70
Thread-0: 71
Thread-1: 69
Thread-1: 70
Thread-0: 72
Thread-1: 71
Thread-0: 73
Thread-1: 72
Thread-0: 74
Thread-1: 73
Thread-1: 74
Thread-0: 75
Thread-0: 76
Thread-1: 75
Thread-0: 77
Thread-1: 76
Thread-1: 77
Thread-0: 78
Thread-1: 78
Thread-1: 79
Thread-0: 79
Thread-0: 80
Thread-1: 80
Thread-0: 81
Thread-1: 81
Thread-1: 82
Thread-0: 82
Thread-0: 83
Thread-0: 84
Thread-1: 83
Thread-0: 85
Thread-1: 84
Thread-0: 86
Thread-0: 87
Thread-1: 85
Thread-1: 86
Thread-0: 88
Thread-1: 87
Thread-1: 88
Thread-0: 89
Thread-1: 89
Thread-0: 90
Thread-0: 91
Thread-1: 90
Thread-0: 92
Thread-0: 93
Thread-1: 91
Thread-1: 92
Thread-0: 94
Thread-1: 93
Thread-0: 95
Thread-1: 94
Thread-0: 96
Thread-0: 97
Thread-0: 98
Thread-1: 95
Thread-0: 99
Thread-1: 96
Thread-1: 97
Thread-1: 98
Thread-1: 99
Thread[Thread-0,5,] join ~~~~~~
Thread[Thread-1,5,] join ~~~~~~
Thread[Thread-2,5,] join ~~~~~~
Thread[Thread-3,5,] join ~~~~~~
Thread count: 1

——————-

herongsendeMacBook-Air:160704-multithread RongSonHo$ java test2
Hello test2
This is bThread!
This is bThread!
This is bThread!
This is bThread!
Thread-1: 0
Thread-1: 1
Thread-1: 2
Thread-1: 3
Thread-1: 4
Thread-1: 5
Thread-0: 0
Thread-2: 0
Thread-0: 1
Thread-1: 6
Thread-3: 0
Thread-3: 1
Thread-1: 7
Thread-0: 2
Thread-2: 1
Thread-0: 3
Thread-0: 4
Thread-1: 8
Thread-3: 2
Thread-3: 3
Thread-1: 9
Thread-1: 10
Thread-0: 5
Thread-2: 2
Thread-2: 3
Thread-0: 6
Thread-0: 7
Thread-1: 11
Thread-3: 4
Thread-1: 12
Thread-0: 8
Thread-2: 4
Thread-0: 9
Thread-1: 13
Thread-3: 5
Thread-1: 14
Thread-0: 10
Thread-2: 5
Thread-2: 6
Thread-0: 11
Thread-1: 15
Thread-3: 6
Thread-1: 16
Thread-0: 12
Thread-2: 7
Thread-2: 8
Thread-0: 13
Thread-0: 14
Thread-1: 17
Thread-1: 18
Thread-3: 7
Thread-1: 19
Thread-1: 20
Thread-0: 15
Thread-0: 16
Thread-0: 17
Thread-0: 18
Thread-0: 19
Thread-0: 20
Thread-0: 21
Thread-0: 22
Thread-0: 23
Thread-0: 24
Thread-0: 25
Thread-0: 26
Thread-0: 27
Thread-2: 9
Thread-0: 28
Thread-0: 29
Thread-0: 30
Thread-0: 31
Thread-1: 21
Thread-1: 22
Thread-3: 8
Thread-1: 23
Thread-1: 24
Thread-0: 32
Thread-0: 33
Thread-0: 34
Thread-2: 10
Thread-0: 35
Thread-0: 36
Thread-0: 37
Thread-2: 11
Thread-2: 12
Thread-2: 13
Thread-2: 14
Thread-2: 15
Thread-2: 16
Thread-2: 17
Thread-2: 18
Thread-2: 19
Thread-2: 20
Thread-1: 25
Thread-1: 26
Thread-1: 27
Thread-1: 28
Thread-1: 29
Thread-1: 30
Thread-1: 31
Thread-1: 32
Thread-1: 33
Thread-1: 34
Thread-1: 35
Thread-1: 36
Thread-1: 37
Thread-1: 38
Thread-1: 39
Thread-1: 40
Thread-1: 41
Thread-3: 9
Thread-3: 10
Thread-3: 11
Thread-3: 12
Thread-1: 42
Thread-2: 21
Thread-0: 38
Thread-2: 22
Thread-1: 43
Thread-3: 13
Thread-1: 44
Thread-1: 45
Thread-1: 46
Thread-2: 23
Thread-0: 39
Thread-0: 40
Thread-0: 41
Thread-0: 42
Thread-0: 43
Thread-0: 44
Thread-0: 45
Thread-2: 24
Thread-1: 47
Thread-1: 48
Thread-3: 14
Thread-1: 49
Thread-2: 25
Thread-0: 46
Thread-2: 26
Thread-1: 50
Thread-3: 15
Thread-1: 51
Thread-2: 27
Thread-0: 47
Thread-2: 28
Thread-1: 52
Thread-1: 53
Thread-3: 16
Thread-1: 54
Thread-2: 29
Thread-0: 48
Thread-2: 30
Thread-1: 55
Thread-3: 17
Thread-1: 56
Thread-2: 31
Thread-0: 49
Thread-2: 32
Thread-1: 57
Thread-1: 58
Thread-3: 18
Thread-3: 19
Thread-1: 59
Thread-2: 33
Thread-0: 50
Thread-2: 34
Thread-1: 60
Thread-3: 20
Thread-1: 61
Thread-2: 35
Thread-0: 51
Thread-2: 36
Thread-1: 62
Thread-3: 21
Thread-1: 63
Thread-2: 37
Thread-0: 52
Thread-2: 38
Thread-1: 64
Thread-3: 22
Thread-1: 65
Thread-2: 39
Thread-0: 53
Thread-2: 40
Thread-1: 66
Thread-3: 23
Thread-1: 67
Thread-2: 41
Thread-2: 42
Thread-0: 54
Thread-2: 43
Thread-2: 44
Thread-1: 68
Thread-3: 24
Thread-1: 69
Thread-2: 45
Thread-0: 55
Thread-2: 46
Thread-1: 70
Thread-3: 25
Thread-3: 26
Thread-1: 71
Thread-2: 47
Thread-0: 56
Thread-2: 48
Thread-1: 72
Thread-3: 27
Thread-1: 73
Thread-2: 49
Thread-0: 57
Thread-2: 50
Thread-1: 74
Thread-3: 28
Thread-1: 75
Thread-2: 51
Thread-0: 58
Thread-2: 52
Thread-1: 76
Thread-3: 29
Thread-1: 77
Thread-2: 53
Thread-0: 59
Thread-2: 54
Thread-1: 78
Thread-3: 30
Thread-1: 79
Thread-2: 55
Thread-0: 60
Thread-2: 56
Thread-1: 80
Thread-3: 31
Thread-1: 81
Thread-2: 57
Thread-0: 61
Thread-2: 58
Thread-1: 82
Thread-1: 83
Thread-3: 32
Thread-1: 84
Thread-2: 59
Thread-2: 60
Thread-0: 62
Thread-2: 61
Thread-1: 85
Thread-3: 33
Thread-1: 86
Thread-2: 62
Thread-0: 63
Thread-2: 63
Thread-1: 87
Thread-3: 34
Thread-1: 88
Thread-2: 64
Thread-0: 64
Thread-2: 65
Thread-1: 89
Thread-3: 35
Thread-1: 90
Thread-2: 66
Thread-0: 65
Thread-2: 67
Thread-1: 91
Thread-3: 36
Thread-1: 92
Thread-2: 68
Thread-0: 66
Thread-2: 69
Thread-1: 93
Thread-3: 37
Thread-1: 94
Thread-2: 70
Thread-0: 67
Thread-2: 71
Thread-1: 95
Thread-3: 38
Thread-1: 96
Thread-2: 72
Thread-0: 68
Thread-2: 73
Thread-1: 97
Thread-3: 39
Thread-1: 98
Thread-2: 74
Thread-0: 69
Thread-2: 75
Thread-1: 99
Thread-3: 40
Thread-2: 76
Thread-2: 77
Thread-0: 70
Thread-2: 78
Thread-3: 41
Thread-2: 79
Thread-0: 71
Thread-2: 80
Thread-3: 42
Thread-2: 81
Thread-0: 72
Thread-2: 82
Thread-3: 43
Thread-2: 83
Thread-0: 73
Thread-2: 84
Thread-3: 44
Thread-2: 85
Thread-2: 86
Thread-2: 87
Thread-0: 74
Thread-2: 88
Thread-3: 45
Thread-3: 46
Thread-3: 47
Thread-2: 89
Thread-0: 75
Thread-2: 90
Thread-2: 91
Thread-2: 92
Thread-3: 48
Thread-2: 93
Thread-0: 76
Thread-0: 77
Thread-0: 78
Thread-2: 94
Thread-3: 49
Thread-2: 95
Thread-0: 79
Thread-0: 80
Thread-2: 96
Thread-2: 97
Thread-3: 50
Thread-2: 98
Thread-2: 99
Thread-0: 81
Thread-3: 51
Thread-0: 82
Thread-3: 52
Thread-0: 83
Thread-0: 84
Thread-0: 85
Thread-3: 53
Thread-0: 86
Thread-3: 54
Thread-0: 87
Thread-0: 88
Thread-0: 89
Thread-3: 55
Thread-0: 90
Thread-0: 91
Thread-3: 56
Thread-3: 57
Thread-0: 92
Thread-0: 93
Thread-3: 58
Thread-3: 59
Thread-3: 60
Thread-3: 61
Thread-3: 62
Thread-3: 63
Thread-3: 64
Thread-3: 65
Thread-3: 66
Thread-3: 67
Thread-3: 68
Thread-0: 94
Thread-3: 69
Thread-0: 95
Thread-0: 96
Thread-3: 70
Thread-0: 97
Thread-3: 71
Thread-0: 98
Thread-0: 99
Thread-3: 72
Thread-3: 73
Thread-3: 74
Thread-3: 75
Thread[Thread-0,5,] join ~~~~~~
Thread[Thread-1,5,] join ~~~~~~
Thread[Thread-2,5,] join ~~~~~~
Thread-3: 76
Thread-3: 77
Thread-3: 78
Thread-3: 79
Thread-3: 80
Thread-3: 81
Thread-3: 82
Thread-3: 83
Thread-3: 84
Thread-3: 85
Thread-3: 86
Thread-3: 87
Thread-3: 88
Thread-3: 89
Thread-3: 90
Thread-3: 91
Thread-3: 92
Thread-3: 93
Thread-3: 94
Thread-3: 95
Thread-3: 96
Thread-3: 97
Thread-3: 98
Thread-3: 99
Thread[Thread-3,5,] join ~~~~~~
Thread count: 1

結論:
依照main裡面thread的join順序,會有所不同
在main裡join的安排順序是thread1, thread2, thread3, thread4
main執行到thread1b.join();時,會一直等到thread1執行結束後,main才會繼續往下跑
thread1結束後,就依此類推到thread2,3,4
所以即使thread2,3,4比thread1先執行完了,也是要先等thread1執行完且也join了
才輪得到2,3,4來join
參考:
1. 執行緒的加入(join):http://openhome.cc/Gossip/JavaGossip-V2/JoinThread.htm

作者

RongSon

Graduate Student of CCU COMM Game Development, Network Communication, macOS/Ubuntu/Android, Arduino/Raspberry Pi/Intel Edison, Java/Python/C/C++

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