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Need help understanding join()

Greenhorn

Posts: 2

posted 9 years ago

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Hello,

this is my first post/question, so please bear with me - and apologies in advance for the length of the post.

I'm trying to understand the behavior of join() using the following code.

class PrintDemo {

public void printCount() {
        try {
            for (int i = 200; i > 0; i--) {
                System.out.println(Thread.currentThread().getName() + ": Counter   ---   " + i);
            }
        } catch (Exception e) {
            System.out.println("Thread  interrupted.");
        }
    }

}

class ThreadDemo extends Thread {

private Thread t;
    private String threadName;
    PrintDemo PD;

ThreadDemo(String name, PrintDemo pd) {
        threadName = name;
        PD = pd;
    }

public void run() {
        synchronized (PD) {
            PD.printCount();
        }
        System.out.println("Thread " + threadName + " exiting.");
    }

public void start() {
        System.out.println("Starting " + threadName);
        if (t == null) {
            t = new Thread(this, threadName);
            t.start();
        }
    }

}

public class TestThread {

public static void main(String args[]) {

PrintDemo PD = new PrintDemo();

ThreadDemo T1 = new ThreadDemo("Thread - 1 ", PD);
        ThreadDemo T2 = new ThreadDemo("Thread - 2 ", PD);

T1.start();
        T2.start();

// wait for threads to end
        try {
            System.out.println("Enter try block");
            T1.join();
            System.out.println("Between joins");
            T2.join();
            System.out.println("Finishing try block");
            for (int i = 0; i <200 ; i++) System.out.println(i);
        } catch (Exception e) {
            System.out.println("Interrupted");
        }
    }
}

What I expected was that when the main thread executes the try block and calls the method join() on T1, it (the main thread) stops and waits for T1 to finish executing before becoming runnable again. However, the following result suggests that this is not the case, since the main thread is running again after the counter of thread T1 is at 83, and continues counting down from 188!

run:
Starting Thread - 1 
Starting Thread - 2 
Thread - 1 : Counter   ---   200
Thread - 1 : Counter   ---   199
Thread - 1 : Counter   ---   198
Thread - 1 : Counter   ---   197
Thread - 1 : Counter   ---   196
Enter try block
Thread - 1 : Counter   ---   195
Thread - 1 : Counter   ---   194
Thread - 1 : Counter   ---   193
Thread - 1 : Counter   ---   192
Thread - 1 : Counter   ---   191
Thread - 1 : Counter   ---   190
Thread - 1 : Counter   ---   189
Thread - 1 : Counter   ---   188
Thread - 1 : Counter   ---   187
Thread - 1 : Counter   ---   186
Thread - 1 : Counter   ---   185
Thread - 1 : Counter   ---   184
Thread - 1 : Counter   ---   183
Thread - 1 : Counter   ---   182
Thread - 1 : Counter   ---   181
Thread - 1 : Counter   ---   180
Thread - 1 : Counter   ---   179
Thread - 1 : Counter   ---   178
Thread - 1 : Counter   ---   177
Thread - 1 : Counter   ---   176
Thread - 1 : Counter   ---   175
Thread - 1 : Counter   ---   174
Thread - 1 : Counter   ---   173
Thread - 1 : Counter   ---   172
Between joins
Finishing try block
0
1
2
3
4
5
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Thread - 1 : Counter   ---   171
Thread - 1 : Counter   ---   170
Thread - 1 : Counter   ---   169
Thread - 1 : Counter   ---   168
Thread - 1 : Counter   ---   167
Thread - 1 : Counter   ---   166
Thread - 1 : Counter   ---   165
Thread - 1 : Counter   ---   164
Thread - 1 : Counter   ---   163
Thread - 1 : Counter   ---   162
Thread - 1 : Counter   ---   161
Thread - 1 : Counter   ---   160
Thread - 1 : Counter   ---   159
Thread - 1 : Counter   ---   158
Thread - 1 : Counter   ---   157
Thread - 1 : Counter   ---   156
Thread - 1 : Counter   ---   155
Thread - 1 : Counter   ---   154
Thread - 1 : Counter   ---   153
Thread - 1 : Counter   ---   152
Thread - 1 : Counter   ---   151
Thread - 1 : Counter   ---   150
Thread - 1 : Counter   ---   149
Thread - 1 : Counter   ---   148
Thread - 1 : Counter   ---   147
Thread - 1 : Counter   ---   146
Thread - 1 : Counter   ---   145
Thread - 1 : Counter   ---   144
Thread - 1 : Counter   ---   143
Thread - 1 : Counter   ---   142
Thread - 1 : Counter   ---   141
Thread - 1 : Counter   ---   140
Thread - 1 : Counter   ---   139
Thread - 1 : Counter   ---   138
Thread - 1 : Counter   ---   137
Thread - 1 : Counter   ---   136
Thread - 1 : Counter   ---   135
Thread - 1 : Counter   ---   134
Thread - 1 : Counter   ---   133
Thread - 1 : Counter   ---   132
Thread - 1 : Counter   ---   131
Thread - 1 : Counter   ---   130
Thread - 1 : Counter   ---   129
Thread - 1 : Counter   ---   128
Thread - 1 : Counter   ---   127
Thread - 1 : Counter   ---   126
Thread - 1 : Counter   ---   125
Thread - 1 : Counter   ---   124
Thread - 1 : Counter   ---   123
Thread - 1 : Counter   ---   122
Thread - 1 : Counter   ---   121
Thread - 1 : Counter   ---   120
Thread - 1 : Counter   ---   119
Thread - 1 : Counter   ---   118
Thread - 1 : Counter   ---   117
Thread - 1 : Counter   ---   116
Thread - 1 : Counter   ---   115
Thread - 1 : Counter   ---   114
Thread - 1 : Counter   ---   113
Thread - 1 : Counter   ---   112
Thread - 1 : Counter   ---   111
Thread - 1 : Counter   ---   110
Thread - 1 : Counter   ---   109
Thread - 1 : Counter   ---   108
Thread - 1 : Counter   ---   107
Thread - 1 : Counter   ---   106
Thread - 1 : Counter   ---   105
Thread - 1 : Counter   ---   104
Thread - 1 : Counter   ---   103
Thread - 1 : Counter   ---   102
Thread - 1 : Counter   ---   101
Thread - 1 : Counter   ---   100
Thread - 1 : Counter   ---   99
Thread - 1 : Counter   ---   98
Thread - 1 : Counter   ---   97
Thread - 1 : Counter   ---   96
Thread - 1 : Counter   ---   95
Thread - 1 : Counter   ---   94
Thread - 1 : Counter   ---   93
Thread - 1 : Counter   ---   92
Thread - 1 : Counter   ---   91
Thread - 1 : Counter   ---   90
Thread - 1 : Counter   ---   89
Thread - 1 : Counter   ---   88
Thread - 1 : Counter   ---   87
Thread - 1 : Counter   ---   86
Thread - 1 : Counter   ---   85
Thread - 1 : Counter   ---   84
Thread - 1 : Counter   ---   83
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Thread - 1 : Counter   ---   82
Thread - 1 : Counter   ---   81
Thread - 1 : Counter   ---   80
Thread - 1 : Counter   ---   79
Thread - 1 : Counter   ---   78
Thread - 1 : Counter   ---   77
Thread - 1 : Counter   ---   76
Thread - 1 : Counter   ---   75
Thread - 1 : Counter   ---   74
Thread - 1 : Counter   ---   73
Thread - 1 : Counter   ---   72
Thread - 1 : Counter   ---   71
Thread - 1 : Counter   ---   70
Thread - 1 : Counter   ---   69
Thread - 1 : Counter   ---   68
Thread - 1 : Counter   ---   67
Thread - 1 : Counter   ---   66
Thread - 1 : Counter   ---   65
Thread - 1 : Counter   ---   64
Thread - 1 : Counter   ---   63
Thread - 1 : Counter   ---   62
Thread - 1 : Counter   ---   61
Thread - 1 : Counter   ---   60
Thread - 1 : Counter   ---   59
Thread - 1 : Counter   ---   58
Thread - 1 : Counter   ---   57
Thread - 1 : Counter   ---   56
Thread - 1 : Counter   ---   55
Thread - 1 : Counter   ---   54
Thread - 1 : Counter   ---   53
Thread - 1 : Counter   ---   52
Thread - 1 : Counter   ---   51
Thread - 1 : Counter   ---   50
Thread - 1 : Counter   ---   49
Thread - 1 : Counter   ---   48
Thread - 1 : Counter   ---   47
Thread - 1 : Counter   ---   46
Thread - 1 : Counter   ---   45
Thread - 1 : Counter   ---   44
Thread - 1 : Counter   ---   43
Thread - 1 : Counter   ---   42
Thread - 1 : Counter   ---   41
Thread - 1 : Counter   ---   40
Thread - 1 : Counter   ---   39
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Thread - 1 : Counter   ---   4
Thread - 1 : Counter   ---   3
Thread - 1 : Counter   ---   2
Thread - 1 : Counter   ---   1
Thread - 2 : Counter   ---   200
Thread - 2 : Counter   ---   199
Thread - 2 : Counter   ---   198
Thread - 2 : Counter   ---   197
Thread - 2 : Counter   ---   196
Thread - 2 : Counter   ---   195
Thread - 2 : Counter   ---   194
Thread - 2 : Counter   ---   193
Thread - 2 : Counter   ---   192
Thread - 2 : Counter   ---   191
Thread - 2 : Counter   ---   190
Thread - 2 : Counter   ---   189
Thread - 2 : Counter   ---   188
Thread - 2 : Counter   ---   187
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Thread - 2 : Counter   ---   185
Thread - 2 : Counter   ---   184
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Thread - 2 : Counter   ---   182
Thread - 2 : Counter   ---   181
Thread - 2 : Counter   ---   180
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Thread - 2 : Counter   ---   176
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Thread - 2 : Counter   ---   171
Thread - 2 : Counter   ---   170
Thread - 2 : Counter   ---   169
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Thread - 2 : Counter   ---   121
Thread - 2 : Counter   ---   120
Thread - 2 : Counter   ---   119
Thread - 2 : Counter   ---   118
Thread - 2 : Counter   ---   117
Thread - 2 : Counter   ---   116
Thread - 2 : Counter   ---   115
Thread - 2 : Counter   ---   114
Thread - 2 : Counter   ---   113
Thread - 2 : Counter   ---   112
Thread - 2 : Counter   ---   111
Thread - 2 : Counter   ---   110
Thread - 2 : Counter   ---   109
Thread - 2 : Counter   ---   108
Thread - 2 : Counter   ---   107
Thread - 2 : Counter   ---   106
Thread - 2 : Counter   ---   105
Thread - 2 : Counter   ---   104
Thread - 2 : Counter   ---   103
Thread - 2 : Counter   ---   102
Thread - 2 : Counter   ---   101
Thread - 2 : Counter   ---   100
Thread - 2 : Counter   ---   99
Thread - 2 : Counter   ---   98
Thread - 2 : Counter   ---   97
Thread - 2 : Counter   ---   96
Thread - 2 : Counter   ---   95
Thread - 2 : Counter   ---   94
Thread - 2 : Counter   ---   93
Thread - 2 : Counter   ---   92
Thread - 2 : Counter   ---   91
Thread - 2 : Counter   ---   90
Thread - 2 : Counter   ---   89
Thread - 2 : Counter   ---   88
Thread - 2 : Counter   ---   87
Thread - 2 : Counter   ---   86
Thread - 2 : Counter   ---   85
Thread - 2 : Counter   ---   84
Thread - 2 : Counter   ---   83
Thread - 2 : Counter   ---   82
Thread - 2 : Counter   ---   81
Thread - 2 : Counter   ---   80
Thread - 2 : Counter   ---   79
Thread - 2 : Counter   ---   78
Thread - 2 : Counter   ---   77
Thread - 2 : Counter   ---   76
Thread - 2 : Counter   ---   75
Thread - 2 : Counter   ---   74
Thread - 2 : Counter   ---   73
Thread - 2 : Counter   ---   72
Thread - 2 : Counter   ---   71
Thread - 2 : Counter   ---   70
Thread - 2 : Counter   ---   69
Thread - 2 : Counter   ---   68
Thread - 2 : Counter   ---   67
Thread - 2 : Counter   ---   66
Thread - 2 : Counter   ---   65
Thread - 2 : Counter   ---   64
Thread - 2 : Counter   ---   63
Thread - 2 : Counter   ---   62
Thread - 2 : Counter   ---   61
Thread - 2 : Counter   ---   60
Thread - 2 : Counter   ---   59
Thread - 2 : Counter   ---   58
Thread - 2 : Counter   ---   57
Thread - 2 : Counter   ---   56
Thread - 2 : Counter   ---   55
Thread - 2 : Counter   ---   54
Thread - 2 : Counter   ---   53
Thread - 2 : Counter   ---   52
Thread - 2 : Counter   ---   51
Thread - 2 : Counter   ---   50
Thread - 2 : Counter   ---   49
Thread - 2 : Counter   ---   48
Thread - 2 : Counter   ---   47
Thread - 2 : Counter   ---   46
Thread - 2 : Counter   ---   45
Thread - 2 : Counter   ---   44
Thread - 2 : Counter   ---   43
Thread - 2 : Counter   ---   42
Thread - 2 : Counter   ---   41
Thread - 2 : Counter   ---   40
Thread - 2 : Counter   ---   39
Thread - 2 : Counter   ---   38
Thread - 2 : Counter   ---   37
Thread - 2 : Counter   ---   36
Thread - 2 : Counter   ---   35
Thread - 2 : Counter   ---   34
Thread - 2 : Counter   ---   33
Thread - 2 : Counter   ---   32
Thread - 2 : Counter   ---   31
Thread - 2 : Counter   ---   30
Thread - 2 : Counter   ---   29
Thread - 2 : Counter   ---   28
Thread - 2 : Counter   ---   27
Thread - 2 : Counter   ---   26
Thread - 2 : Counter   ---   25
Thread - 2 : Counter   ---   24
Thread - 2 : Counter   ---   23
Thread - 2 : Counter   ---   22
Thread - 2 : Counter   ---   21
Thread - 2 : Counter   ---   20
Thread - 2 : Counter   ---   19
Thread - 2 : Counter   ---   18
Thread - 2 : Counter   ---   17
Thread Thread - 1  exiting.
Thread - 2 : Counter   ---   16
Thread - 2 : Counter   ---   15
Thread - 2 : Counter   ---   14
Thread - 2 : Counter   ---   13
Thread - 2 : Counter   ---   12
Thread - 2 : Counter   ---   11
Thread - 2 : Counter   ---   10
Thread - 2 : Counter   ---   9
Thread - 2 : Counter   ---   8
Thread - 2 : Counter   ---   7
Thread - 2 : Counter   ---   6
Thread - 2 : Counter   ---   5
Thread - 2 : Counter   ---   4
Thread - 2 : Counter   ---   3
Thread - 2 : Counter   ---   2
Thread - 2 : Counter   ---   1
Thread Thread - 2  exiting.
BUILD SUCCESSFUL (total time: 0 seconds)

Can anybody please explain why thread T1 is not counting down to 1, but stops at 83? Shouldn't the main thread wait until thread T1 completes?

Thanks and best wishes,
Udo

Henry Wong

author

Posts: 23958

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posted 9 years ago

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Udo Klein wrote:
Can anybody please explain why thread T1 is not counting down to 1, but stops at 83? Shouldn't the main thread wait until thread T1 completes?

Yeah, the documentation does imply that the join() method is to wait until the thread has completed (has died) doesn't it? It reality, if you read the later paragraphs of the javadoc, it actually waits until the thread is not alive (by the isAlive() method). And since you never started the thread (that is represented by the object referred to by T1), it is not an alive thread, and hence, the join() method returns immediately.

And BTW, welcome to the ranch. I have also added this topic to the threads forum for you.

Henry

Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)

Paweł Baczyński

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Posts: 2237

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posted 9 years ago

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The problem is you are invoking join() on a Thread instance that has never started.
You have overridden start() method of the Thread class. Inside this method you create another Thread instance and start() that instance, not your original Thread.

What was the reason of this strange strategy?
If you wanted to pass names to your threads why not call super(threadName) in a constructor of your ThreadDemo class?
Or call setName().

And welcome to the Ranch!

Java 8 (verified skill)
Skill verified by Campbell Ritchie

Udo Klein

Greenhorn

Posts: 2

posted 9 years ago

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Thanks for the quick replies. The code mislead me into thinking that t1 actually gets started by calling start(), but that was not the case.

@Pawel: there was no reason for this strange strategy, I just used some code I found in a tutorial.

I've now changed the code, and it behaves as expected. Now thread t1 actually gets started, and after the main thread calls join() on thread t1, the main thread waits for t1 to complete.

class PrintDemo implements Runnable {

public void run() {

synchronized (this) {
            for (int i = 50; i > 0; i--) {
                System.out.println(Thread.currentThread().getName() + ": Counter   ---   " + i);
            }
        }
    }

}

public class TestThread {

public static void main(String args[]) {

Runnable r = new PrintDemo();

Thread t1 = new Thread(r, "Thread - 1 ");
        Thread t2 = new Thread(r, "Thread - 2 ");

t1.start();
        t2.start();

System.out.println("State of t1: " + t1.getState() );
        System.out.println("State of t1: " + t2.getState() );

// wait for threads to end
        try {
            System.out.println("Enter try block");
            t1.join();
            System.out.println("Between joins");
            t2.join();
            System.out.println("Finishing try block");
            for (int i = 0; i < 50; i++) {
                System.out.println(i);
            }
        } catch (Exception e) {
            System.out.println("Interrupted");
        }
    }
}

A sample result:

run:
Thread - 1 : Counter   ---   50
State of t1: RUNNABLE
State of t1: BLOCKED
Enter try block
Thread - 1 : Counter   ---   49
Thread - 1 : Counter   ---   48
Thread - 1 : Counter   ---   47
Thread - 1 : Counter   ---   46
Thread - 1 : Counter   ---   45
Thread - 1 : Counter   ---   44
Thread - 1 : Counter   ---   43
Thread - 1 : Counter   ---   42
Thread - 1 : Counter   ---   41
Thread - 1 : Counter   ---   40
Thread - 1 : Counter   ---   39
Thread - 1 : Counter   ---   38
Thread - 1 : Counter   ---   37
Thread - 1 : Counter   ---   36
Thread - 1 : Counter   ---   35
Thread - 1 : Counter   ---   34
Thread - 1 : Counter   ---   33
Thread - 1 : Counter   ---   32
Thread - 1 : Counter   ---   31
Thread - 1 : Counter   ---   30
Thread - 1 : Counter   ---   29
Thread - 1 : Counter   ---   28
Thread - 1 : Counter   ---   27
Thread - 1 : Counter   ---   26
Thread - 1 : Counter   ---   25
Thread - 1 : Counter   ---   24
Thread - 1 : Counter   ---   23
Thread - 1 : Counter   ---   22
Thread - 1 : Counter   ---   21
Thread - 1 : Counter   ---   20
Thread - 1 : Counter   ---   19
Thread - 1 : Counter   ---   18
Thread - 1 : Counter   ---   17
Thread - 1 : Counter   ---   16
Thread - 1 : Counter   ---   15
Thread - 1 : Counter   ---   14
Thread - 1 : Counter   ---   13
Thread - 1 : Counter   ---   12
Thread - 1 : Counter   ---   11
Thread - 1 : Counter   ---   10
Thread - 1 : Counter   ---   9
Thread - 1 : Counter   ---   8
Thread - 1 : Counter   ---   7
Thread - 1 : Counter   ---   6
Thread - 1 : Counter   ---   5
Thread - 1 : Counter   ---   4
Thread - 1 : Counter   ---   3
Thread - 1 : Counter   ---   2
Thread - 1 : Counter   ---   1
Between joins
Thread - 2 : Counter   ---   50
Thread - 2 : Counter   ---   49
Thread - 2 : Counter   ---   48
Thread - 2 : Counter   ---   47
Thread - 2 : Counter   ---   46
Thread - 2 : Counter   ---   45
Thread - 2 : Counter   ---   44
Thread - 2 : Counter   ---   43
Thread - 2 : Counter   ---   42
Thread - 2 : Counter   ---   41
Thread - 2 : Counter   ---   40
Thread - 2 : Counter   ---   39
Thread - 2 : Counter   ---   38
Thread - 2 : Counter   ---   37
Thread - 2 : Counter   ---   36
Thread - 2 : Counter   ---   35
Thread - 2 : Counter   ---   34
Thread - 2 : Counter   ---   33
Thread - 2 : Counter   ---   32
Thread - 2 : Counter   ---   31
Thread - 2 : Counter   ---   30
Thread - 2 : Counter   ---   29
Thread - 2 : Counter   ---   28
Thread - 2 : Counter   ---   27
Thread - 2 : Counter   ---   26
Thread - 2 : Counter   ---   25
Thread - 2 : Counter   ---   24
Thread - 2 : Counter   ---   23
Thread - 2 : Counter   ---   22
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Thread - 2 : Counter   ---   20
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Thread - 2 : Counter   ---   9
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Thread - 2 : Counter   ---   6
Thread - 2 : Counter   ---   5
Thread - 2 : Counter   ---   4
Thread - 2 : Counter   ---   3
Thread - 2 : Counter   ---   2
Thread - 2 : Counter   ---   1
Finishing try block
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BUILD SUCCESSFUL (total time: 0 seconds)

Paweł Baczyński

Bartender

Posts: 2237

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posted 9 years ago

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For an excellent first post, have a cow!

I've got no option but to sell you all for scientific experiments. Or a tiny ad:

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