A space to connect knowledge, one line of code a day.
Discover tutorials, ideas, and notes from a learning journey.
Verify that published articles are readable while draft detail URLs remain inaccessible.
For validation purposes we might need to check if data entered by our users is a valid data for our application to process. A simple mechanism for checking if a character inputted is a digit or not can be done by using the java.lang.Character class isDigit(char c) method. In this example you will learn how […]
In this example we are going to learn how to find out if an ArrayList object contains the specified element. To check if an ArrayList object contains the specified element we can use the contains(Object o) method. This method returns a boolean true when the specified element is found in the ArrayList, otherwise return false. […]
In this example we are going to learn how to obtain the size of an ArrayList object. As you might already know, a java.util.ArrayList is a class that we can use to create a dynamic sized array. We can add and remove elements from the ArrayList dynamically. Because its elements can be added or removed […]
In this example we will learn how to use the java.util.ArrayList class. An ArrayList is part of the Java Collection Framework. By using this class we can create a dynamic size array of data, which means we can add or remove elements from the array dynamically. In the code below we will see the demonstration […]
The Hello World program is a classic example to start with when we begin to learn a new programming language. The main purpose is to know the basic syntax of the language. Below is the Java version of a Hello World program, it is simple enough to start. package org.kodejava.basic; public class HelloWorld { public […]
Stay curious. There is always something new to learn.
Writer and founder of Diary Coding — sharing notes, tutorials, and experiences about programming for anyone who wants to keep learning.