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Q931. In an array every element is repeated twice except one, Find that element?

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Q932. What is the ideal situation / case for using heap sort ?

Algorithm

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Q933. Difference between Arrays and LinkedList ?

Data Structure

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Q934. Difference between Arrays and ArrayList ?

Core Java

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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Q935. What is the time and space complexity for different operations for arrays ?

Core Java

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Q936. Are arrays Thread Safe ?

Core Java

Ans. Yes

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Q937. How can we check equality for Arrays in Java ?

Core Java

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

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Q938. Are Arrays treated like primitives or like objects in Java ?

Core Java

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Q939. Where are arrays stored in memory - stack or heap ?

Core Java

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Q940. What are jagged arrays ?

Core Java

Ans. an array of different sizes

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Q941. Can you write code to copy one array into another ?

Data Structure

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Q942. What is an anonymous array in Java ?

Core Java

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Q943. What is ArrayStoreException ?

Core Java

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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Q944. What is the difference between ArrayIndexOutOfBoundException and ArrayStoreException?

Core Java

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Q945. Can we use generics with arrays in Java ?

Core Java

Ans. No

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Q946. Can we change the size of array once created ?

Core Java

Ans. No. Arrays cannot resize dynamically.

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Q947. How arrays work internally ?

Core Java

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Q948. Does Java generate .class file for interfaces ?

Core Java

Ans. Yes

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Q949. Can we declare an Interface with abstract keyword ?

Core Java

Ans. Yes

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Q950. Can we declare constructor inside an interface ? Why ?

Core Java

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Q951. Can we override a non-static method as static in Java ?

Core Java

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

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Q952. Can you prevent overriding a method without using final modifier or without declaring it private ?

Core Java

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Q953. What is method hiding in Java ?

Core Java

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Q954. Can a class extend itself in Java ?

Core Java

Ans. No

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Q955. Why Concurrent Collection Classes are fail-fast in Java ?

Core Java

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Q956. What is Lock interface in Java Concurrency API ?

Core Java

Ans. Lock interface provide more extensive locking. They allow more flexible structuring and may support multiple associated Condition objects.

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Q957. What is an Atomic Operation ?

General

Ans. Atomic operations are performed in a single unit of task without interference from other operations.

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Q958. What is context switching wrt Threads in Java?

Core Java

Ans. Context Switching is the process of storing and restoring of CPU state so that Thread execution can be resumed from the same point at a later point of time.

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Q959. What are the different ways to avoid multi Threading related problems in Java ?

Core Java

Ans. Synchronization,
Concurrent classes,
Volatile keyword,
Implementing concurrent Lock interface,
Immutable classes

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Q960. What is Thread scheduler ?

Operating System

Ans. Thread Scheduler is the Operating System service that allocates the CPU time to the available runnable threads.

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