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In the How do I calculate the MD5 digest of a string? example you can see how to calculate the MD5 digest from a text or a string. We are using the Apache Commons Codec library and use the DigestUtils.md5Hex() method to generate the MD5. I’ve mentioned in that post that we can also generate […]
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 […]
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