Ques: what java does not support?
Ans: Java does not support C/C++ style pointer arithmetic, where object addresses and unsigned integers (usually long integers) can be used interchangeably. This allows the garbage collector to relocate referenced objects and ensures type safety and security.
Ques: Collection API ?
Ans: Collection API is a set of classes and interfaces that support operation on collections of objects. These classes and interfaces are more flexible, more powerful, and more regular than the vectors, arrays, and hashtables if effectively replaces. Example of classes are HashSet, HashMap, ArrayList, LinkedList, TreeSet and TreeMap. Example of interfaces are Collection, Set, List and Map.
Ques: Is Iterator a Class or Interface and use of it?
Ans: Iterator is an interface which is used to step through the elements of a Collection.
Ques: What is a transient variable in Java?
Ans: Transient variable is a variable that may not be serialized. If you don't want some field to be serialized, you can mark that field transient or static.
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