Given a list of characters, convert the list to a string.
Input : list = {‘g’, ‘e’, ‘e’, ‘k’, ‘s’}
Output : “geeks”Input : list = {‘a’, ‘b’, ‘c’}
Output : “abc”
Convert List of Characters to String in Java:
1. Using StringBuilder class
Simple solution would be to iterate through the list and create a new string with the help of StringBuilder class as shown below:
// Java program for convert character list to stringimport java.util.Arrays;import java.util.List; // Convert List of Characters to String in Javaclass GFG { public static void main(String[] args) { // create character list and initialize List<Character> str = Arrays.asList('G', 'e', 'e', 'k', 's'); // create object of StringBuilder class StringBuilder sb = new StringBuilder(); // Appends characters one by one for (Character ch : str) { sb.append(ch); } // convert in string String string = sb.toString(); // print string System.out.println(string); }} |
Geeks
2. Using join() method of joiner class :
Joiner class can be used to join pieces to text specified as an array, and return the results as a string.This method also called Guava method.
// Java program for convert character list to stringimport com.google.common.base.Joiner;import java.util.Arrays;import java.util.List; // Convert List of Characters to String in Javaclass GFG { public static void main(String[] args) { // create character list and initialize List<Character> str = Arrays.asList('G', 'e', 'e', 'k'); // convert in string // use join() method String string = Joiner.on("").join(str); // print string System.out.println(string); }} |
Geek
3. Using List.toString(), String.substring() and String.replaceAll() method:
The toStrin() method on a list returns a string that is surrounded by square brackets and has commas between items. The idea is to get rid of square brackets using substring() method, and comma and space replace by using replaceAll() method.
Implement the above method:
// Java program for convert character list to stringimport java.util.Arrays;import java.util.List; // Convert List of Characters to String in Javaclass GFG { public static void main(String[] args) { // create character list and initialize List<Character> str = Arrays.asList('G', 'e', 'e', 'k'); // convert in string // remove [] and spaces String string = str.toString() .substring(1, 3 * str.size() - 1) .replaceAll(", ", ""); // print string System.out.println(string); }} |
Geek
4. using Collectors:
In java 8 we can make use of stream API with collectors.
Implement the above method:
// Java program for convert character list to stringimport java.util.stream.Collectors;import java.util.Arrays;import java.util.List; // Convert List of Characters to String in Javaclass GFG { public static void main(String[] args) { // create character list and initialize List<Character> str = Arrays.asList('G', 'e', 'e', 'k'); // convert in string // using collect and joining() method String string = str.stream().map(String::valueOf).collect(Collectors.joining()); // print string System.out.println(string); }} |
Geek
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