Master Java’s String Join Method: Concatenate with Ease Discover the power of Java’s `join()` method, a simple and efficient way to combine multiple strings with a specified delimiter. Learn the syntax, key parameters, and noteworthy points to unlock its full potential.

Unlock the Power of Java’s String Join Method

When working with strings in Java, combining multiple elements into a single string can be a daunting task. Fortunately, the join() method comes to the rescue, making it easy to concatenate elements with a specified delimiter.

The Syntax of Join

The join() method has two syntax forms:

• String.join(delimiter, element1, element2,...)
• String.join(delimiter, iterable)

Here, delimiter is the character or string used to separate the elements, and element1, element2,... or iterable are the elements to be joined.

Key Parameters

The join() method takes two essential parameters:

• delimiter: The character or string used to separate the elements.
• elements: The elements to be joined, which can be a variable number of CharSequence objects or an iterable containing CharSequence objects.

Noteworthy Points

• Any class implementing CharSequence can be passed to join(), including String, StringBuffer, and CharBuffer.
• If an iterable is passed, its elements will be joined, provided it implements CharSequence.

Return Value

The join() method returns a new string with the given elements joined using the specified delimiter.

Example 1: Joining CharSequence Objects

Let’s join three strings – “Java”, “is”, and “fun” – using the - delimiter:
java
String result = String.join("-", "Java", "is", "fun");
System.out.println(result); // Output: Java-is-fun


Example 2: Joining an Iterable

Create an ArrayList of strings and join its elements using the - delimiter:
“`java
List list = new ArrayList<>();
list.add(“Java”);
list.add(“is”);
list.add(“fun”);

String result = String.join(“-“, list);
System.out.println(result); // Output: Java-is-fun
“
With thejoin()` method, you can effortlessly combine multiple elements into a single string, making your coding life easier!