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HashMap is non-synchronized ?

Do Hashtable allow null keys and null values?

Which one is most suitable to implement an LRU cache?

ConcurrentModificationException will be thrown only when an object is concurrently modified.

The data members of interface in java are:

To define a child class from the Parent class following is used:

The part of a "try" block that is always executed is:

The most reliable way to compare two Strings for equality is by:

Which additional keyword may be used with try-catch blocks?

Java handles memory allocation and reuse using a process called: