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Difference between ConcurrentHashMap and Collections.synchronizedMap and Hashtable in Java
Difference between ConcurrentHashMap and Collections.synchronizedMap and Hashtable in Java
The synchronized collections classes, Hashtable and Vector, and the synchronized wrapper classes, Collections.synchronizedMap and Collections.synchronizedList, provide a basic conditionally thread-safe implementation of Map and List. However, several factors make them unsuitable for use in highly concurrent applications for example their single collection-wide lock is an impediment to scalability and it often becomes necessary to lock a collection for a considerable time during iteration to prevent ConcurrentModificationException.
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Flow control statements
Flow control statements
The flow control statements allow you to conditionally execute statements, to repeatedly execute a block of statements, or to just change the sequential flow of control.
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Whizlabs SCBCD (Sun Certified Business Component Developer) Exam Simulator
Whizlabs SCBCD (Sun Certified Business Component Developer) Exam Simulator
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