The Template Method design pattern defines the workflow for achieving a specific operation. It allows the subclasses to modify certain steps without changing the workflow’s structure. The following example shows how Template Method pattern works. Class diagram Java Code Vehicle.java defines a vehicle and hot it works package com.programcreek.designpatterns.templatemethod; abstract public class Vehicle { … Read more
Spring framework is difficult to learn, especially when you want to develop a real project with industry standards. Reading tutorials is a good way for learning at the beginning. But finally, you still need to read code from real projects. Luckily, there are some very good open source projects that use Spring framework. Here are … Read more
This is an example for showing how to use join(). Interview question: Use Java multi-threading to calculate the expression 1*2/(1+2). Solution: Use one thread to do addition, one thread to do multiplication, and a main thread to do the division. Since there is no need to communicate data between threads, so only need to consider … Read more
Let’s take a look how to parse a sequence of Java statement by using ASTParser from Eclipse JDT. By saying a sequence of a statement, I mean lines of code that are from a method like the following: int i = 9; int j = i+1;int i = 9; int j = i+1; Here is … Read more
This short tutorial shows how to use Stanford POSTagger by using a simple Java example. You can directly use it in your project.
A verb can occurs in a sentence in various format such as base form, past tense, past participle, 3rd person singular present, etc. To have a general idea of how each word occurs, we often need to get base form of a word. This examples shows how to convert a verb to its base form … Read more
Latest Update: 2014/05/21 This post shows how to build a Spring Hello World application. The following are all steps required to make a Spring hello world program. 1. Set up development environment IDE: Eclipse IDE for Java EE Developers. The latest version is Eclipse Kepler (4.3.2). Here is the one you should download: 2. Create … Read more
This code example is for showing how to insert a blank line to Java source code by using eclipse JDT. The approach is similar with adding a statement or comment to source code, especially adding a comment. It will insert a blank line before the first statement in the following code: public class test { … Read more
This code example is for counting total number of methods in projects under Eclipse work space. We can use Eclipse JDT – Java Model to do this. Counting total number of method in a certain java project is a very simple task. The following code works under Eclipse Plug-in project only. If you don’t know … Read more
This code example belongs to the Eclipse JDT tutorial series. If you want to get all class names, method names and field names from a Java jar file, you can use the code below to get them. This code example is for getting information(e.g. field in a class, method name, method return type, etc.) from … Read more
This belongs to Eclipse JDT Tutorial Series. This code example is for inserting a statement to existing Java source code by using eclipse JDT. It works inside of a Plug-in. For simplicity purpose, the following code simple add a method invocation statement called “add” to the first line of a method. public class Main { … Read more
This code example belongs to the Eclipse JDT tutorial series. The goal of this code example is add a comment to the following code. public class Main { public static void main(String[] args) { int i = 1; System.out.println(i); } public static void add() { int i = 1; System.out.println(i); } }public class Main { … Read more
When using JDT, you may want to find all references of a given method and then do something with the references. This can be done by using method JDTSearchProvider.searchMethodReference(). The following is sample code: // First of all, get all the type declaration of the class. IType [] typeDeclarationList = unit.getTypes(); for (IType typeDeclaration … Read more
Here is the design of automatic website content generator. The web design is for technique website that consists code, but it is also good for other kind of websites. This generator would be different with others in the market. Other auto blog generator does not have a lot of technique to process the natural language, and … Read more
Decorator pattern adds additional features to an existing object dynamically. In this post, I will use a simple example – decorate your girlfriend – to illustrate how decorator pattern works. 1. Decorator Pattern Story Let’s assume you are looking for a girlfriend. There are girls from different countries such as America, China, Japan, France, etc. … Read more