Three Ways to Convert a Char to String in Java: Performance and Trade-offs

In Java, converting a primitive char to a String object is a common task that can affect performance and memory usage, particularly inside high-frequency loops. The three standard methods are Character.toString(char), String.valueOf(char), and the concatenation shorthand "" + char, each with distinct readability and memory characteristics. Character.toString() is explicit and readable, while String.valueOf() is widely recommended for general primitive-to-string conversions. The concatenation approach is quick to write but may generate garbage collector pressure in intensive iterative operations. Understanding how the JVM allocates memory differently for stack-based primitives and heap-based String objects helps developers choose the most appropriate method for their use case.