Say that I have a private variable and I have a setVariable() method for it which is synchronized, isn’t it exactly the same as using volatile modifier?
Say that I have a private variable and I have a setVariable() method for
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Say that I have a private variable and I have a setVariable() method for it which is synchronized, isn’t it exactly the same as using volatile modifier?
No. Volatile means the variable isn’t cached in any per-thread cache, and its value is always retrieved from main memory when needed. Synchronization means that those per-thread caches will be kept in sync at certain points. In theory, using a volatile variable can come with a great speed penalty if many threads need to read the value of the variable, but it is changed only rarely.