Hello, Adventurer! Today, we will learn about splitting and joining strings — two vital operations for processing textual data in Java. Are you ready? Let's start this journey!

In Java, the split() method divides a string into several substrings based on a delimiter — a character that separates words. It stores these substrings into an array. Here's an example to clarify:

In this snippet, we have a sentence that we divide into separate words using the split() method with a space as the delimiter. The results are stored in the array words.

The join() method merges an array of strings back into a single string using a specified delimiter. It is the reverse of the split() method. Here's how it works:

In the example above, we took an array of words and combined them into a single string, using a space as the delimiter.

You can combine split() and join() to rearrange sentences. For instance, let's take "I love programming" and rearrange it to "programming love I":

In this example, we first split the sentence into words. Next, we swapped the first and last words, and, finally, we joined them back into a new sentence.

In fact, String.join is so flexible that it even allows to specify all parts to join one by one:

It's very useful at times!

Great job, Explorer! You've learned how to split and join strings in Java using split() and join(). Now, you will try your hand at some exercises to reinforce your newly acquired skills. Are you ready to explore further? Let's proceed!