Interview Questions and Answers for 'C' | Search Interview Question

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Q271. Difference between Query param and path param ?

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Q272. Write SQL query to join 2 tables ?

SQL

Ans. Select * from table1 join Select * from table2

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Q273. Can you tell us a use case of reflection in java that you have applied ?

Design

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Q274. Give specific situation about when to go for constructor based injection and setter based injection in spring.

Spring

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Q275. Write program to recursively iterate through map ?

Core Java

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Q276. what is dispatcher servlet@componentScan use ?

Spring Framework

Ans. @ComponentScan in a Spring Application.

With Spring, we use the @ComponentScan annotation along with the @Configuration annotation to specify the packages that we want to be scanned. @ComponentScan without arguments tells Spring to scan the current package and all of its sub-packages.

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Q277. What is stereotype annotation ?

Spring

Ans. These annotations are used to create Spring beans automatically in the application context. The main stereotype annotation is @Component . @Controller: Which is used to create Spring beans at the controller layer. The stereotype annotations in spring are @Component, @Service, @Repository and @Controller

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Q278. When singleton can break and how to resolve it

Design

Ans. Deserialization. In serialization, we can save the object of a byte stream into a file or send over a network. Suppose if you serialize the Singleton class, and then again de-serialize that object, it will create a new instance, hence deserialization will break the Singleton pattern.

To overcome this issue, we need to override readResolve() method in the Singleton class and return the same Singleton instance.

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Q279. Difference between interface and inheritance

Core Java

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Q280. Combine and join integer and string list to single list and sort.

Core Java

Ans. Object[] combined = new Object[first.length second.length];
System.arraycopy(first, 0, combined, 0, first.length);
System.arraycopy(second, 0, combined, first.length, second.length);

-- OR --

Object[] combined = Stream.concat(Arrays.stream(first), Arrays.stream(second)).toArray();

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Q281. What are different awt constructs ?

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Q282. Details of networking apis supported by java.

Ans. retrofit 2, volly and OkHttp

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Q283. What is Docker ?

Docker

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Q284. What are the 22 possible values of x where x== -x (true) ?

Core Java

Ans. byte x = 0;
short x = 0;
char x = 0;
int x = 0;
int x = Integer.MIN_VALUE;
float x = 0.0f;
float x = -0.0f;
long x = 0;
long x = Long.MIN_VALUE;
double x = 0.0;
double x = -0.0;
Byte x = 0;
Short x = 0;
Character x = 0;
Integer x = 0;
Integer x = Integer.MIN_VALUE;
Float x = 0.0f;
Float x = -0.0f;
Long x = 0L;
Long x = Long.MIN_VALUE;
Double x = 0.0;
Double x = -0.0;

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Q285. Can we increase the buffer size while working with Buffered Streams ? How ?

Core Java

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Q286. Can we disable auto flushing for PrintWriter ?

Core Java

Ans. Yes

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Q287. Have you ever faced any problem because of PrintWriter buffer and autoflush mechanism ? How did you got rid of it ?

Core Java

Ans. Yes , we faced trouble once wherein we were trying to set certain elements to the PrintWriter. As in some cases the PrintWriter held too much information and hence it would get flushed before we could append those elements.

We disabled auto flushing and provided our own explicit flushing.

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Q288. How elements are passed to the server in case of Get and Post request ?

Web Service

Ans. In case of Get request, form data / values are sent within url whereas these are sent as part of request body in case of Post.

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Q289. Where will you configure database details in tomcat server ?

Tomcat

Ans. Add a file META-INF/context.xml into the root of your web application folder, which defines database connection detail :

File : META-INF/context.xml

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Q290. How do you debug Javascript code ?

Javascript

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Q291. Can we have 2 styling classes with a single div element ? Which class will take precedence in case of conflict in such case ?

CSS

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Q292. Create DB schema for Employee, Department.

Database

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Q293. What are the distributed caches ?

Server

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Q294. What are meta classes in Java ?

Core Java

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Q295. What is object slicing ?

C++

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Q296. What is something faulty about java ?

Core Java

Ans. Not purely object oriented Language.

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Q297. Can we have more than two constructors in a class ?

Core Java

Ans. Yes, through constructor overloading

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Q298. If we have a return statement inside the finally block, Then what will happen ?

Core Java

Ans. Returning from inside a finally block will cause exceptions to be lost. A return statement inside a finally block will cause any exception that might be thrown in the try block to be discarded.

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Q299. What is the concept of hibernate versioning ?

Hibernate

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Q300. What is cluster ?

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