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Showing posts with label core java tutorials. Show all posts
Showing posts with label core java tutorials. Show all posts
Wednesday, 31 May 2023

Java ObjectMapper readValue vs convertValue

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The ObjectMapper class in Jackson provides two methods for converting between JSON and Java objects: readValue() and convertValue(). readVal...
Wednesday, 24 May 2023

Java ExcecutorService Example

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The Java ExecutorService is an interface that provides a way to execute tasks asynchronously. It is part of the java.util.concurrent package...
Tuesday, 23 May 2023

Usage of Enum and Switch Keyword in Java

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The enum keyword in Java is used to create a special type of class that can only contain a finite set of values. These values are called enu...
Thursday, 18 May 2023

Java arraylist contains case insensitive

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There are several ways to check if an element exists in an ArrayList in a case-insensitive way in Java. Using  String.equalsIgnoreCase() The...

Java hashmap to json string

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There are several ways to convert a Java HashMap to a JSON string. Here are two of the most common methods: Using Gson Gson is a popular Jav...
Friday, 7 October 2016

How does ConcurrentHashMap achieves its Scalability?

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Question) How does ConcurrentHashMap achieve its Scalability? Sometimes this multithreading + collection interview question is also asked ...
Sunday, 24 January 2016

Java one year experience interview questions

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1. Explain System.out.println()? The system is a class That is present in java.lang package. Out is a static final field (variable) of  ...