Java

Gradle dependencySubstitution

by No3x on 19th July 2019 in Blog, Java, Tutorials • 0 Comments

I worked on a project that uses a framework. To add a new sub class I had to make the base class, that is part of the framework, open for extension. I was able to compile the framework on my own without the need to create a local artifact repository then create a new artifact and new version by the… Read more →

JavaFX Gluon Ignite Guice Inject Controller

by No3x on 19th November 2016 in Java • 0 Comments

I had to inject a whole controller into another controller with the guice implementation of gluon ignite. I will show an approach doing so. This is applicable if you have set the controller id in your fxml. Otherwise this snipped requires slightly modifications. I assume you have ignite already running and injecting stuff already but facing the “inject a controller… Read more →

Generate Javadoc with UML Diagrams

by No3x on 25th March 2015 in Java • 0 Comments

It is very useful to have UML Diagrams integrated into your javadoc – they give you a neat visual overview of the contents of you sourcecode. I want to show you how to integrate this into an automated build. I implemented this with an ant target and my IDE Netbeans. Add this to your build.xml in the root of your… Read more →

toString(), equals() Contract

by No3x on 6th October 2013 in Java • 0 Comments

Any Object is an Object or a child of an Object as described in the Java Language Specification: The class Object is a super class (§8.1) of all other classes. A variable of type Object can hold a reference to the null reference or to any object, whether it is an instance of a class or an array (§10). All… Read more →

For – Know the difference

by No3x on 31st July 2013 in Java • 0 Comments

I would like to write some words about the difference of the for loop behaviour. At first you should read the code and notice 2 different for usages. Both should do the same. Do they?

public class Main {

    /**
     * @param args
     */
    public static void main(String[] args) {
        String[] blablubb = { "a", "b", "c" };
		// 1)
        for(String s : blablubb) {
            s = "over";
        }
        printArray(blablubb);

		// 2)
        for (int i = 0; i < blablubb.length; i++) {
            blablubb[i] = "over";
        }
        printArray(blablubb);

    }

    public static void printArray(String[] arr) {
        for( String s : arr ) {
            System.out.println(s);
        }
    }

}

public class Main {

/**

* @param args

public static void main(String[] args) {

String[] blablubb = { "a", "b", "c" };

// 1)

for(String s : blablubb) {

s = "over";

}

printArray(blablubb);

// 2)

for (int i = 0; i < blablubb.length; i++) {

blablubb[i] = "over";

}

printArray(blablubb);

}

public static void printArray(String[] arr) {

for( String s : arr ) {

System.out.println(s);

}

I assumed the first loop would also overwrite the string in the array – as the second one does. But it does not! –… Read more →