Print sequence using 3 threads in java

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In this post, we will see how to print sequence using 3 threads in java.It is similar to printing odd-even numbers using two threads in java.

Problem

You are given 3 threads. You need to print sequence using these 3 threads.You need to print in natural order up to MAX.

For example:
Let’s say you have 3 threads. T1,T2 and T3.
If MAX is 10, you need to print:

T1 1
T2 2
T3 3
T1 4
T2 5
T3 6
T1 7
T2 8
T3 9
T1 10

Solution

We will use concept of remainder here.

  • If number%3==1 then T1 will print the number and increment it else will go in the wait state.
  • If number%3==2 then T2 will print the number and increment it else will go in the wait state.
  • If number%3==0 then T3 will print the number and increment it else will go in the wait state.

Let me provide simple program for it.
Let’s create a class named “PrintSequenceRunnable” which will implement the Runnable interface.

Let’s create a class named “PrintThreadsSequentiallyMain” which will implement the Runnable interface.

When you run above program, you will get below output.

T1 1
T2 2
T3 3
T1 4
T2 5
T3 6
T1 7
T2 8
T3 9
T1 10

That’s all about printing threads using 3 threads in java.

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