Republished articles with source attribution. This collection is separate from Diary Coding’s original guides and does not display ads.
You need to calculate the timing or elapsed time of your code execution, so you know how long a particular method or some block of code take to finish its execution. You can do this by capturing the start-time and the end-time using System.currentTimeMillis() and find their differences. Another way is to use the StopWatch […]
You have an array variable, and you want to make a clone of this array into a new array variable. To do this, you can use Apache Commons Lang ArrayUtils.clone() method. The code snippet below demonstrates the cloning of a primitive array that contains some integer elements in it. package org.kodejava.commons.lang; import org.apache.commons.lang3.ArrayUtils; public class […]
You need to print the contents of an array variable. The long way to it is to user a loop to print each element of the array. To simplify this, you can use the Apache Commons Lang ArrayUtils.toString() method. This method can take any array as a parameter and print out the contents separated by […]
package org.kodejava.commons.lang; public class ObjectHashCodeDemo { public static void main(String[] args) { Book book1 = new Book(1L, "Spring Boot in Action", "Craig Walls"); Book book2 = new Book(2L, "Docker in Action", "Jeff Nickoloff"); Book book3 = book1; System.out.println("book1.hashCode() = " + book1.hashCode()); System.out.println("book2.hashCode() = " + book2.hashCode()); System.out.println("book3.hashCode() = " + book3.hashCode()); } } package […]
In the following code snippet, you will see how to pass some connection arguments when connecting to a database. To do this, we can use the java.util.Properties class. We can put some key value pairs as a connection arguments to the Properties object before we pass this information into the DriverManager class. Let’s see the […]
package org.kodejava.regex; public class GetNumberOfWordsFromString { public static void main(String[] args) { String text = "The quick brown fox jumps over the lazy dog."; String one = truncateAfterWords(1, text); System.out.println("1 = " + one); String two = truncateAfterWords(2, text); System.out.println("2 = " + two); String four = truncateAfterWords(4, text); System.out.println("4 = " + four); String […]
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.