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Q1621. Should we do anything to avoid memory leaks in Java ?

Ans. Java has a intrinsic way of checking leaks and reclaiming memory called garbage collection. Moreover Java doesn't support pointer arithmetics , so there is very low comparative chance of memory leaks, compared to C,C++

Though there may be tools that may audit code to make sure that we are not leaving much for the garbage collection to work but I have never heard anyone doing anything for memory leaks in Java.

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Q1622. Write a Program to draw a fish ?

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Q1623. What is the difference between inheritance in PHP vs. Javascript?

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Q1624. Write a method to track every click on a page.

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Q1625. Have you had to work with memory leak problems in javascript ?

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Q1626. prototypal inheritance in Javascript

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Q1627. What is the use of defining equals , compareTo and hashcode methods in a class ? Where are they used ?

Ans. equals, compareTo and hashcode are of use when the objects are used within collections.

Equals helps with collections that helps maintaining only unique objects ( like Set )

compare and compareTo helps with collections that helps maintaining objects in order ( TreeSet, TreeMap etc )

hascode helps with collections that facilitates hash searching ( like hashSet, hashMap etc )

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Q1628. Write a program to make an array act as a set.

Ans. public Set convertArrayToList(T array[]) {
Set set = new HashSet<>(Arrays.asList(array));
return set;
}

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Q1629. Write a unit test case using java 8.

Ans. public List convertAllToUpperCase(List words) {
return words.stream().map(String::toUpperCase).collect(Collectors.toList());
}

@Test
public void testAllToUpperCase() {
List expected = Arrays.asList("JAVA8", "STREAMS");
List result = convertAllToUpperCase(Arrays.asList("java8", "streams"));
assertEquals(expected, result);
}

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Q1630. What are the advantages and disadvantages of Lambda Expression ?

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Q1631. Can the value of a static variable be changed ?

Ans. Yes the value of a static variable can be changed. It's the final keyword that restrict the modification of value not static.

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Q1632. Why wait(), notify(), notifyAll() methods are in Object class instead of Thread class?

Ans. wait() and notify() methods are defined in Object class rather than Thread class.If wait() and notify() were on the Thread instead then each thread would have to know the status of every other thread and there is no way to know thread1 that thread2 was waiting for any resource to access.Hence, notify, wait, notifyAll methods are defined in object class in Java.

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Q1633. How can we create an arraylist of unique values ?

Ans. We can put the value in a set to enforce uniqueness and then dum those value into an arraylist.

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Q1634. Difference between Let and Var in Javascript ?

Ans. Var scopes the variable to the nearest function whereas Let scopes the variable to nearest block.

For example -

function printNumbers() {
for(var i = 1; i < 3: i++){
console.log(i);
}

console.log(i); // works fine and will print 3 as i has a function scope and not local loop scope
}

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Q1635. What are benefits of strongly typing variables ?

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Q1636. How is the declaration of enum in Typescript differ from Javascript ?

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Q1637. Interface vs Abstraction

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Q1638. Explain Servlet config

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Q1639. How Object-Oriented Programming is implemented in JavaScript? How they differ from other languages?

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Q1640. How is cohesion achieved in JavaScript ?

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Q1641. What is the different between collection and Stream Api ?

Ans. data under collection are actually stored in memory so that they can be retrieved when needed whereas data in streams are not stored and hence we need to construct it again when needed.

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Q1642. What are the benefits of Java over other Programming Languages ?

Ans. 1. JVM that makes it platform independent and facilitates portability.
2. Garbage Collector that protects from Memory Leaks.
3. Only usage of references and not pointer arithmetic and hence protects the application from memory issues like dangling pointers, memory leaks etc.
4. Support for OOPs that makes application development and maintenance easy.
5. Facilitates library development through use of interface / abstract classes.
6. Facilitates creation of scalable applications.
7. Huge repository of libraries and pool of people with java skill.

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Q1643. what is strict mode in javascript ? How is it used ?

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Q1644. String processing in Java

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Q1645. Have you ever used sessionStorage ? What is the better way to store session information - sessionStorage or session cookie ?

Session Management

Ans. Session Cookie, because session storage can be accessed from XSS (Cross site Scripting) attacks but cookies (if set with "HttpOnly" and "Secure" flags) are more safer against these attacks.

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Q1646. What are the benefits of using UI framework like Angular , View js etc instead of plain vanilla js and html ?

Ans. These frameworks facilitates easier product development and enhancement and maintainability by having separation of concerns ( using oops ) and helps in development of reusable libraries / components. So in nutshell , they make development and maintenance of large scale application easier.

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Q1647. Explain method overridding.

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Q1648. How to swap two numbers without using a third variable?

Ans. int a = 10;
int b = 20;

b = b + a; // now b is sum of both the numbers
a = b - a; // b - a = (b + a) - a = b (a is swapped)
b = b - a; // (b + a) - b = a (b is swapped)

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Q1649. What's the difference between an array and Vector?

Ans. An array groups data of same primitive type and is static in nature while vectors are dynamic in nature and can hold data of different data types.

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Q1650. Can main() method in Java can return any data?

Ans. In java, main() method can't return any data and hence, it's always declared with a void return type.

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