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Editorial Team
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Asked: 2026-05-20T15:11:05+00:00

so let’s say that I have a static variable, which is an array of

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so let’s say that I have a static variable, which is an array of size 5.
And let’s say I have two threads, T1 and T2, they both are trying to change the element at index 0 of that array. And then use the element at index 0.
In this case, I should lock the array until T1 is finished using the element right?

Another question is let’s say T1 and T2 are already running, T1 access element at index 0 first, then lock it. But then right after T2 tries to access element at index 0, but T1 hasn’t unlocked index 0 yet. Then in this case, in order for T2 to access element at index 0, what should T2 do? should T2 use call back function after T1 unlocks index 0 of the array?

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1 Answer

  1. Editorial Team

    Synchronization in java is (technically) not about refusing other threads access to an object, it about ensuring unique usage of it (at one time) between threads using synchronization locks. So T2 can access the object while T1 has synchronization lock, but will be unable to obtain the synchronization lock until T1 releases it.

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