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John Selawsky
Senior Java Developer and Tutor at
LearningTree
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A senior Java developer and Java tutor at Learning Tree International programming courses. Sometimes I write some stupid programming stuff about Java. 7 years experience of Java/J2EE development. In Java We Trust.
Author's articles
John Selawsky
Statements in Java
12 January 2025 14:09
IF ELSE Java Statements
An if else statement in Java is a conditional statement. Java uses conditions just like mathematics, allowing comparisons that yield Boolean results. So you can test inputs to see how they compare to a static set of values that you specify. Because the result is Boolean, there are only two possible results...
John Selawsky
Java Algorithms
9 January 2025 9:00
Bubble Sort Java
In this article the bubble sort algorithm is described. It is the easiest sorting algorithm to learn, so every software developer knows it. This algorithm is usually used for learning purposes or you may get it as a task in your Java Junior Interview. Bubble sort algorithm is very easy to understand, however it is not...
John Selawsky
Strings in Java
1 January 2025 12:04
Java String contains() Method
This function is specially designed to check if a string ‘contains’ another string or not. If you’re new to this you might end up using it to find a ‘character’. But it won’t serve the purpose. In this article, we’ll address how java.lang.String.contains() is used, implemented...
John Selawsky
Loops in Java
25 December 2024 12:29
Java Nested Loops
Java, like most other programming languages, supports nested loops. This means just a loop within a loop. In this article, we are going to find out about how to work with nested loops in Java...
John Selawsky
Java Numbers
25 December 2024 8:35
How to Convert Long to Int in Java
In this article we are going to explain how to convert long to int in Java and write some code examples. Since long is a larger data type than int, here we should use type casting for such conversion...
John Selawsky
Strings in Java
23 December 2024 12:53
Java String replace() Method
What are the common replace() methods of String class in Java? The String class provides four different kinds of replace() methods in Java. Each of the methods addresses a specific use case. Their names are listed below...
John Selawsky
Java Collections
21 December 2024 8:49
HashMap getOrDefault method in Java
What is the getOrDefault method for HashMaps in Java? “The getOrDefault method returns the value mapped to the specified key in a HashMap. If that key is not present then a default value is returned.”...
John Selawsky
Learning Java
2 December 2024 22:22
Junior → Senior. How Many Years Do You Need to Become a Senior Java Developer
As you may know by now, traditionally in the tech industry developers are divided into four gradations based on their qualification levels: Junior, Middle, Senior and Team Lead. Or five, if you include coding Interns as the lowest-ranked...
John Selawsky
Learning Python
12 November 2024 15:28
Python Nested Dictionary
In Python, a dictionary is a data structure that holds key-value pairs. A nested dictionary is simply a dictionary within a dictionary. This allows you to store more complex, hierarchical data structures
John Selawsky
Learning Python
7 November 2024 13:52
Length of an Array in Python
Hey there, If you've ever found yourself wondering, "How do I find out the length of an array in Python?" then you've come to the right place. This article is going to walk you through everything you need to know about determining the length of an array in Python
John Selawsky
Learning Python
16 September 2024 9:35
How to Learn Python in 2024: Step-by-Step Guide
Acquiring a new skill for your current profession or switching to a new career path is easier than ever today, especially when you focus on learning thought-after tech skills like programming
John Selawsky
Learning Python
30 July 2024 15:58
Convert JSON to CSV in Python
Hello, Python enthusiasts! Today, we're tackling a common data conversion task: converting JSON to CSV. By the end of this article, you'll be equipped with the knowledge and tools to easily transform JSON data into CSV format using Python.
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