How Do You Efficiently Convert a Char to a String in Java?

String Conversion Dilemma: Converting a Char to a String

Problem:

In the realm of programming, you encounter scenarios where a char, a single character, needs to transform into a String. This conversion process raises the question: how do we seamlessly achieve this transformation?

Solution:

To morph a char into a String, you can rely on the Character.toString(char) method. This technique is a straightforward approach that returns the character enclosed in a String. Alternatively, you can employ the String.valueOf(char) method, which essentially performs the same task.

Concatenation Shortcut:

Some programmers utilize string concatenation as a shortcut for char to String conversion. This method involves appending the char to an empty String:

String s = "" + 's';

However, this seemingly convenient method actually compiles down to a less efficient process:

String s = new StringBuilder().append("").append('s').toString();

This approach incurs performance overhead because it allocates a char[] that may be larger than necessary and then makes a defensive copy of the array when creating the String.

String.valueOf(char): A More Efficient Option:

The String.valueOf(char) method stands out as a more efficient solution. It bypasses the char[] allocation by wrapping the char in a single-element array and passing it directly to a package-private String constructor. This maneuver evades the potentially unnecessary array copy, resulting in improved performance.

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