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In this post you will learn how to calculate the MD5 digest of a string. One of the most commonly use for this functionality in an application is to secure a password. For security reasons, you will never want to store user passwords in the application database in a plain text. There are other more […]
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 this example, you will learn how to find out if two defined date objects are on the same day. It means that we are only interested in the date information and ignoring the time information of these date objects. We will be using an API provided by the Apache Commons Lang library. So here […]
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Writer and founder of Diary Coding — sharing notes, tutorials, and experiences about programming for anyone who wants to keep learning.