In this post, we will discuss how to convert char array to String in Java. A new String should be allocated that represents the sequence of characters contained in the char array. Since String is immutable in Java, the subsequent modification of the character array does not affect the allocated string.
1. Using String Constructor
The simplest solution is to pass the char array into the String constructor. The String constructor internally uses Arrays.copyOf() to copy the contents of the character array.
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// Convert char array to String in Java class Util { public static void main(String[] args) { char[] chars = {'T', 'e', 'c', 'h', 'i', 'e', ' ', 'D', 'e', 'l', 'i', 'g', 'h', 't'}; String string = new String(chars); System.out.println(string); } } |
Output:
Techie Delight
2. String.valueOf() or String.copyValueOf()
We can encapsulate the String construtor call by using String.valueOf() or String.copyValueOf() which internally does the same thing.
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// Convert char array to String in Java class Util { public static void main(String[] args) { char[] chars = {'T', 'e', 'c', 'h', 'i', 'e', ' ', 'D', 'e', 'l', 'i', 'g', 'h', 't'}; String string = String.copyValueOf(chars); System.out.println(string); } } |
Output:
Techie Delight
3. Using StringBuilder
Another plausible way of converting a char array to String is using StringBuilder in Java. The idea is to iterate over the characters and append each char to a StringBuilder. Finally, call toString() method on the StringBuilder when iterated over all chars.
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// Convert char array to String in Java class Util { public static void main(String[] args) { char[] chars = {'T', 'e', 'c', 'h', 'i', 'e', ' ', 'D', 'e', 'l', 'i', 'g', 'h', 't'}; StringBuilder sb = new StringBuilder(); for (char ch: chars) { sb.append(ch); } String string = sb.toString(); System.out.println(string); } } |
Output:
Techie Delight
4. toString() + substring() + Regex
(Not recommended)
The idea here is to get a string representation of the specified array. The string representation consists of a list of the array’s elements, enclosed in square brackets ("[]") and all adjacent elements are separated by a comma followed by a space ", ".
We can easily get rid of the square brackets by calling substring() function, and comma + space by using replaceAll() method.
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import java.util.Arrays; // Convert char array to String in Java class Util { public static void main(String[] args) { char[] chars = {'T', 'e', 'c', 'h', 'i', 'e', ' ', 'D', 'e', 'l', 'i', 'g', 'h', 't'}; String string = Arrays.toString(chars) .substring(1, 3*chars.length-1) .replaceAll(", ", ""); System.out.println(string); } } |
Output:
Techie Delight
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