In Java, a HashMap is a useful tool for storing and getting key-value pairs easily. Using hashing techniques allows fast access to data and performs important operations efficiently. To use HashMap effectively i
In Java, Hashmap is a part of the java.util package. Hashmap gives constant-time performance for basic operations, i.e., get and put. How to Create a Hashmap in Java Now that you know what a Hashmap is. Let’s understand how you can create a Hashmap in Java. As Hashmap is pa...
Java 8 is a giant step forward for the Java language. Writing this book has forced me to learn a lot more about it. In Project Lambda, Java gets a new closure syntax, method-references, and default methods on interfaces. It manages to add many of the features of functional languages wit...
random number generation, and data structure design. For instance, in hash table implementations, modulo helps in efficiently distributing keys across the array. It’s also crucial in cyclic data structures and algorithms, where wrapping around is necessary. Consider a scenario in a circular buffer,...
In the classjava.net.HttpURLConnection, if a security manager is installed, calls that request to open a connection require permission. Concurrency Classes and interfaces have been added to thejava.util.concurrentpackage. Methods have been added to thejava.util.concurrent.ConcurrentHashMapclass to ...
The composition is more restricted when compared to Aggregation. The composition is not a Java feature. It is mainly considered a design technique. The following diagram shows a composition example. In this, an Employee has a bank account. We know that a bank account cannot exist without an ...
Studentclass andAddressclass. Every student has an address so the relationship between student and address is a Has-A relationship. But if you consider its vice versa then it would not make any sense as anAddressdoesn’t need to have aStudentnecessarily. Lets write this example in a java ...
An interface is a reference type in Java. It is similar to class. It is acollectionof abstract methods. It is used to achieve totalabstraction. I believe this is the first question you might expect inJava Interview. Very basic questions but widely used in interview 🙂 ...
in html, square brackets are not used. instead, angle brackets < > are used to enclose html elements, and attributes are enclosed in quotes within the angle brackets. curly brackets are not used in html either. what is the difference between a parenthesis and a bracket? parentheses are used...
What is JWT?In this tutorial we will be learning the basic of JSON Web Token (JWT). In next tutorial we will be implementing Spring Boot +JWT + MYSQL Hello World Example JWT stands for JSON Web Token. JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and ...