If i come across a situation where i will have to make each and every method in my Java program synchronized, will that affect the performance of my code?
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If i come across a situation where i will have to make each and every method in my Java program synchronized, will that affect the performance of my code?
Yes, it will influence the performance.
If your application is mostly single-threaded, then the impact will be very small, because uncontested lock acquisition is very fast (on modern JVMs such as HotSpot).
If your application is heavily multi-threaded and multiple threads access the same objects concurrently, then the impact will be larger.
Note that having every single method synchronized does not guarantee that your code is thread-safe, you can still easily get race conditions.