What is a Linked List? A linked list is a linear data structure used for storing collections of data Successive elements are connected by pointers The last element points to NULL Each element is a separate object and is called a Node Each node in a linked list comprises of two parts Data Reference to […]
Java Keytool is a key and certificate management tool that is used to manipulate Java Keystores, and is included with Java. A Java Keystore is a container for authorization certificates or public key certificates, and is often used by Java-based applications for encryption,…
URL: https://www.progressiverobot.com/soap-webservices-in-java-example-eclipse/ Soap Webservices in java can be developed in may ways. We learned about [JAX-WS SOAP Web Services](/community/tutorials/jax-ws-tutorial) in our last tutorial, today we will learn how we can create SOAP web service and it's client program using Eclipse. Here we will not use JAX-WS, we will be using Apache Axis that is integrated […]
URL: https://www.progressiverobot.com/java-sort-list/ Sometimes we have to sort a list in Java before processing its elements. In this tutorial, we will learn how to sort a list in the natural order. We will also learn how to use our own Comparator implementation to sort a list of objects. Java List is similar to arrays except that […]
URL: https://www.progressiverobot.com/java-append-to-file/ Today we will look into how to append to a file in java. Java append to file is a common [java IO](/community/tutorials/java-io-tutorial) operation. For example, whenever we print something to server logs, it gets appended to the existing file. Java append to file We can append to file in java using following classes. […]
URL: https://www.progressiverobot.com/java-session-management-servlet-httpsession-url-rewriting/ Session Management in Java Servlet Web Applications is a very interesting topic. Session in Java Servlet are managed through different ways, such as Cookies, HttpSession API, URL rewriting etc.  This is the third article in the series of Web Applications […]
URL: https://www.progressiverobot.com/proxy-design-pattern/ Proxy Design pattern is one of the Structural design pattern and in our opinion one of the simplest pattern to understand. Proxy Design Pattern  Proxy design pattern intent according to GoF is: Provide a surrogate or placeholder for another object to control access to it. The definition itself is very […]
URL: https://www.progressiverobot.com/permutation-and-combinatios-in-python/ Permutations and Combinations of a set of elements are different arrangements of the elements of the set. Combination is a collection of the elements where the order doesn't matter Permutation is an arrangement of a set where the order does matter. Let's consider a set as : {A, B, C} The permutations of the above […]
Learn essential design patterns in Java with real-world examples. Discover how to use Factory, Singleton, Strategy, and more to write cleaner, scalable code
URL: https://www.progressiverobot.com/sort-hashmap-by-value-java/ HashMap in java provides quick lookups. They store items in "key, value" pairs. To get a value from the HashMap, we use the key corresponding to that entry. HashMaps are a good method for implementing Dictionaries and directories. Key and Value can be of different types (eg – String, Integer). We can sort […]
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