Given a String, the task is to convert it into a List of Characters in Java.
Examples:
Input: String = "Geeks"
Output: [G, e, e, k, s]
Input: String = "GeeksForGeeks"
Output: [G, e, e, k, s, F, o, r, G, e, e, k, s]
Below are the various ways to do so:
- Naive Method
Approach:
- Get the String.
- Create an empty List of Characters.
- Add each character of String to the List.
- Return the List.
Below is the implementation of the above approach:
import java.util.*;
class GFG {
public static List<Character>
convertStringToCharList(String str)
{
List<Character> chars = new ArrayList<>();
for (char ch : str.toCharArray()) {
chars.add(ch);
}
return chars;
}
public static void main(String[] args)
{
String str = "Geek";
List<Character>
chars = convertStringToCharList(str);
System.out.println(chars);
}
}
|
- Using Java 8 Stream:
Approach:
- Get the String.
- Create a List of Characters.
- Convert to String to IntStream using chars() method.
- Convert IntStream to Stream using mapToObj() method.
- Collect the elements as a List Of Characters using collect()
- Return the List.
Below is the implementation of the above approach:
import java.util.*;
import java.util.stream.Collectors;
class GFG {
public static List<Character>
convertStringToCharList(String str)
{
List<Character> chars = str
.chars()
.mapToObj(e -> (char)e)
.collect(Collectors.toList());
return chars;
}
public static void main(String[] args)
{
String str = "Geek";
List<Character>
chars = convertStringToCharList(str);
System.out.println(chars);
}
}
|
- Using Java 8 Stream:
Approach:
- Get the String.
- Use the AbstractList interface to convert the String into List of Character
- Return the List.
Below is the implementation of the above approach:
import java.util.*;
class GFG {
public static List<Character>
convertStringToCharList(String str)
{
return new AbstractList<Character>() {
@Override
public Character get(int index)
{
return str.charAt(index);
}
@Override
public int size()
{
return str.length();
}
};
}
public static void main(String[] args)
{
String str = "Geek";
List<Character>
chars = convertStringToCharList(str);
System.out.println(chars);
}
}
|
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Last Updated :
11 Dec, 2018
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