Sometimes we have to convert char to String in java program. Here we will look into different methods you can convert character to string in java. We will also learn how to convert char array to String using different methods.
Convert char to String Java
Here is a simple program showing different ways to convert char to string in java.
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package com.journaldev.string; public class CharToStringJava { public static void main(String[] args) { // char to string char c="a"; String str = String.valueOf(c); // using Character class str = Character.toString(c); // another way str = new Character(c).toString(); // string concatenation - worst performance str = "" + c; // char array to string char[] ca = { 'a', 'b', 'c' }; str = String.valueOf(ca); // recommended way str = new String(ca); } } |
Let’s look at these methods one by one.
String.valueOf(char c)
This is the most efficient method to convert char to string. You should always use this method and this is the recommended way to convert character to string in java program.
Character.toString(c)
This method internally calls String.valueOf(c), so there is no difference between this one. You can use this too if you are already using Character class in your code.
new Character(c).toString();
This is another way, however not recommended because we are creating a Character unnecessarily.
String concatenation
str = "" + c; is the worst way to convert char to string because internally it’s done by new StringBuilder().append("").append(c).toString() that is slow in performance.
Let’s look at the two methods to convert char array to string in java program.
String constructor
You can use String(char[] value) constructor to convert char array to string. This is the recommended way.
String.valueOf(char[] data)
String valueOf method is overloaded and there is one that accepts character array. Internally this method calls the String constructor, so it’s same as above method.
That’s all for converting char to string and char array to string in java.