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JAVA Swing Menu Example

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1. Introduction A menu provides a space-saving way to let the user choose one of several options. Other components with which the user can make a one-of-many choices include, combo boxes, lists, radio buttons, spinners, and tool bars. Menus are unique in that, by convention, they aren’t placed with the other components in the UI. Instead, a menu usually appears ...

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Junit Unrooted Tests

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1. Introduction One common mistake that developers make in creating JUnit is the version mismatch. Projects seems to be now keen on creating Junit test cases using the more advance annotation based (JUnit 4) rather than the older way (Extending TestCase class) of doing it. A common error or issue is when a developer loads/imports a JUnit 4 on the ...

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Trie tutorial in java

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In this tutorial, we are going to discuss a data structure called Trie. Trie is a tree structure representing words. It could be used for implementing dictionary or spell checker. The following tutorial is implemented in java using junit 4.12 for unit test. 1. Introduction to Trie Trie is an ordered tree structure which takes advantage of the structure of the keys ...

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GWT HTMLPanel Example

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In this tutorial, we will learn ins and out of the Google Web Toolkit (GWT) HTML Panel. In our previous tutorial GWT Tutorial for Beginners, we explained how to create a GWT Web Application project using eclipse and we have seen the basic steps to develop user interface using widgets. In this tutorial, we will focus on GWT HTML panel ...

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Vaadin Window Example

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A widget container to open, close and move overlay widgets on the screen, is a window. This kind of widget is used to create application dialogs for multiple tasks. You can have a window blocking the UI (modal window) or a non blocking window (modeless window). The simplest window is an alert notification but you can use this widget to make complex ...

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JavaFX Concurrency Example

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This is a JavaFX Concurrency Example. Java GUI applications are inherently multithreaded. Multiple threads perform different tasks to keep the UI in sync with the user actions. JavaFX, like Swing and AWT, uses a single thread, called JavaFX Application Thread, to process all UI events. The following table shows an overview of the whole article: Table Of Contents 1. Introduction ...

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Hibernate Mapping Example

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In this example, we will show you how to use hibernate with its mapping capability. We are going to show a one-to-many bi-directional mapping in hibernate using XML mappings. We will configure our hibernate with hibernate.cfg.xml and then we are going to create a mapping with example.hbm.xml . One-to-many relationship is the relationship in which each record in one table ...

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JAVA Swing Application Example

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Swing is a GUI widget toolkit for Java. It is part of Oracle’s Java Foundation Classes (JFC) – an API for providing a graphical user interface (GUI) for Java programs. Swing was developed to provide a more sophisticated set of GUI components than the earlier Abstract Window Toolkit (AWT). JAVA provides a rich set of libraries to create Graphical User ...

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Test-Driven Development With Mockito

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In this example we will learn how to do a Test Driven Development (TDD) using Mockito. A unit test should test a class in isolation. Side effects from other classes or the system should be eliminated if possible. Mockito lets you write beautiful tests with a clean & simple API. Tools and technologies used in this example are Java 1.8, ...

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Vaadin Menu Example

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We can organize commands into a menu. The menu allows us to stack multiple buttons in a logic way for the work flow. If we have too much commands or buttons in our user interface we need to consider to use a menu in our application. A menu has a tree structure with a main root with the top nodes attached to ...

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