How to Join Arrays of Strings in Java: A Java Equivalent to PHP\'s join()?

Joining Arrays in Java: A Java Equivalent to PHP's join()

In Java, like PHP, the need often arises to concatenate multiple strings into a single string while incorporating a delimiter or "glue" string between each element. While PHP has the join() function for this purpose, Java offers several options to achieve the same result.

Using String.join() in Java 8 and Above

Since Java 8, the String class has a join() method that allows for easy and concise array concatenation. The syntax for this method is:

<code class="java">static String join(CharSequence delimiter, CharSequence... elements)</code>

where delimiter is the separating string to be placed between elements, and elements is a variable number of strings or objects that can be converted to strings.

For example:

<code class="java">String[] names = {"John", "Jane", "Mark"};
String joinedNames = String.join(", ", names);
// joinedNames will now contain "John, Jane, Mark"</code>

Using Apache Commons Lang StringUtils.join()

For versions of Java prior to 8, or for projects that do not yet use Java 8, the Apache Commons Lang library provides an alternative join() function through its StringUtils class. This function has a similar syntax to String.join():

<code class="java">static String join(Object[] array, String separator)</code>

However, instead of requiring explicit conversion to strings, StringUtils.join() automatically converts objects within the array to strings if necessary.

For example:

<code class="java">String[] names = {"John", "Jane", "Mark"};
String joinedNames = StringUtils.join(names, ", ");
// joinedNames will now contain "John, Jane, Mark"</code>

Conclusion

Both String.join() and Apache Commons Lang's StringUtils.join() provide convenient methods for joining arrays of strings in Java. While String.join() is more concise and requires less code, its availability is limited to Java 8 and later versions. For projects that require support for older Java versions, the StringUtils.join() function from Apache Commons Lang can be a reliable alternative.

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