Below are various ways to convert to char c to String s (in decreasing order of speed and efficiency)

char c = 'a'; String s = String.valueOf(c); \\ fastest + memory efficient String s = Character.toString(c); String s = new String(new char[]{c}); String s = String.valueOf(new char[]{c}); String s = new Character(c).toString(); String s = "" + c; \\ slowest + memory inefficient 

Below are various ways to convert to char c to String s (in decreasing order of speed and efficiency)

char c = 'a'; String s = String.valueOf(c); // fastest + memory efficient String s = Character.toString(c); String s = new String(new char[]{c}); String s = String.valueOf(new char[]{c}); String s = new Character(c).toString(); String s = "" + c; // slowest + memory inefficient 

Below are various ways to convert to char c to String s (in decreasing order of speed and efficiency)

char c = 'a'; String s = String.valueOf(c); \\ fastest + memory efficient String s = Character.toString(c); String s = new String(new char[]{c}); String s = String.valueOf(new char[]{c}); String s = "" + c; \\ slowest + memory inefficient 

Below are various ways to convert to char c to String s (in decreasing order of speed and efficiency)

char c = 'a'; String s = String.valueOf(c);  \\ fastest + memory efficient String s = Character.toString(c); String s = new String(new char[]{c}); String s = String.valueOf(new char[]{c}); String s = new Character(c).toString(); String s = "" + c;  \\ slowest + memory inefficient