How-to articles, tricks, and solutions about JAVA

The Java for-each loop, also known as the enhanced for loop, is a convenient way to iterate over the elements of an array or a collection. It eliminates the need to use an index variable to access the elements of the collection.

There are several ways to iterate through a HashMap in Java: Using the for-each loop

There are several ways to iterate over the entries in a Map in Java. Here are some options:

You can initialize an ArrayList in one line in Java using the following syntax:

"Could not find or load main class" is an error message shown when a Java program is run, but the main class cannot be found or loaded.

To generate a random integer within a specific range in Java, you can use the nextInt method of the Random class.

There are several ways to declare and initialize an array in Java. Here are a few examples: Declare and initialize an array of integers with size 5

To convert a String to an int in Java, you can use the parseInt() method of the Integer class. Here's an example:

The comparison of strings is one of the mostly used Java operations. If you’re looking for different ways to compare two strings in Java, you’re at the right place.

Learn the two static methods of createTempFile of the File class. Use the deleteOnExit() method to ensure that the temporary created file will automatically be deleted.

Learn 3 ways of creating files in Java with examples. Use java.io.File class, java.io.FileOutputStream class or Java NIO Files.write() class for creating new files in Java.

Learn the ways to split a string in Java. The most common way is using the String.split () method, also see how to use StringTokenizer and Pattern.compile ().