How to Concatenate Elements of a String Array in Java: Equivalent to PHP\'s join() Function?

Java Equivalent of PHP's Join Function for Arrays

Problem:

You need to concatenate elements of a String array using a delimiter, similar to PHP's join() function.

Solution:

Java 8 and Later:

Starting from Java 8, you can use the built-in String.join() method:

<code class="java">String.join(", ", new String[] {"Hello", "World", "!"})</code>

This will generate:

Hello, World, !

Java 7 and Earlier:

For earlier versions of Java, you can use the StringUtils class from Apache Commons Lang:

<code class="java">StringUtils.join(new String[] {"Hello", "World", "!"}, ", ")</code>

This will also generate the string:

Hello, World, !

Note: The StringUtils.join() method is more versatile and supports additional features, such as customizing the separator character and handling null elements.

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