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Q781. Can we declare an array without assigning the size of an array?

Ans. No, It will throw compile time error saying "must provide either dimension expressions or an array initializer"

Alternatively we can provide array initializer like

String[] strArray = new String[]{"Buggy","Bread"};

which will initialize it to size 2 with values as "Buggy" and "Bread"

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Q782. Find the length of the non repeated numbers in an array.

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Q783. Find number of recycled pairs in n array.

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Q784. Write code to serialize and deserialize an array of strings ?

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Q785. Given a max-heap represented as an array, Return the n th largest element without modifying the heap.

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Q786. In an array every element is repeated twice except one, Find that element?

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Q787. What is the ideal situation / case for using heap sort ?

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Q788. Difference between Arrays and LinkedList ?

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Q789. Difference between Arrays and ArrayList ?

Ans. Both Arrays and ArrayLists are used to store elements. Elements can be either primitives or objects in case of Arrays, but only objects can be stored in Arraylist. Array is a fixed length data structure while arraylist is variable length collection class. Once created, you cannot change the size of the arrays, but arraylists can dynamically resize itself when needed.Another notable difference between Arrays and Arrayslist is that arary is part of core java programming and array list is part of collection classes

Sample Code for arrays arraylist

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Q790. What is the time and space complexity for different operations for arrays ?

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Q791. Are arrays Thread Safe ?

Ans. Yes

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Q792. How can we check equality for Arrays in Java ?

Ans. You call the method java.util.Arrays.equals(Object[] a, Object[] a2)?

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Q793. Are Arrays treated like primitives or like objects in Java ?

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Q794. Where are arrays stored in memory - stack or heap ?

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Q795. What are jagged arrays ?

Ans. an array of different sizes

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Q796. Can you write code to copy one array into another ?

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Q797. What is an anonymous array in Java ?

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Q798. What is ArrayStoreException ?

Ans. It's an exception that is thrown when we attempt to add value of an incompatible type to an array.

For example -

Object[] strArray = new String[2];
strArray[0] = 5;

In this code, strArray reference of type Object has currently been assigned the String array but at line 2 we are trying to add an integer value.

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Q799. What is the difference between ArrayIndexOutOfBoundException and ArrayStoreException?

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Q800. Can we use generics with arrays in Java ?

Ans. No

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Q801. Can we change the size of array once created ?

Ans. No. Arrays cannot resize dynamically.

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Q802. How arrays work internally ?

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Q803. Does Java generate .class file for interfaces ?

Ans. Yes

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Q804. Can we declare an Interface with abstract keyword ?

Ans. Yes

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Q805. Can we declare constructor inside an interface ? Why ?

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Q806. Can we override a non-static method as static in Java ?

Ans. No, there is no method overriding with static methods.

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Q807. Can you prevent overriding a method without using final modifier or without declaring it private ?

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Q808. What is method hiding in Java ?

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Q809. Can a class extend itself in Java ?

Ans. No

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Q810. Why Concurrent Collection Classes are fail-fast in Java ?

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