How to convert char[] to List in Java?

By traversing to the elements of array you can convert char array to List<Character>.

public static List<Character> getBoxedList(char[] arr) {
 if (arr == null)
  return null;

 List<Character> result = new ArrayList<>();

 for (char i : arr) {
  result.add(i);

 }
 return result;
}

App.java

package com.sample.app;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class App {

 private static void printElements(List<Character> arr) {
  for (char i : arr) {
   System.out.print(i + " ");
  }
  System.out.println();
 }

 public static List<Character> getBoxedList(char[] arr) {
  if (arr == null)
   return null;

  List<Character> result = new ArrayList<>();

  for (char i : arr) {
   result.add(i);

  }
  return result;
 }

 public static void main(String args[]) throws IOException {
  char[] arr = { 'a', 'e', 'i', 'o', 'u' };

  List<Character> result1 = getBoxedList(arr);
  printElements(result1);

 }
}

Output

a e i o u    

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How to convert char[] to Character[] in Java?

Traverse through the array and convert.

public static Character[] getBoxedArray(char[] arr) {
 if (arr == null)
  return null;

 Character[] result = new Character[arr.length];
 int index = 0;
 for (char i : arr) {
  result[index] = Character.valueOf(i);
  index++;
 }
 return result;
}

App.java

package com.sample.app;

public class App {

 private static void printElements(Character[] arr) {
  for (Character i : arr) {
   System.out.print(i + " ");
  }
  System.out.println();
 }

 public static Character[] getBoxedArray(char[] arr) {
  if (arr == null)
   return null;

  Character[] result = new Character[arr.length];
  int index = 0;
  for (char i : arr) {
   result[index] = Character.valueOf(i);
   index++;
  }
  return result;
 }

 public static void main(String args[]) {
  char[] arr = { 'a', 'e', 'i', 'o', 'u' };

  Character[] result1 = getBoxedArray(arr);

  printElements(result1);

 }

}

Output

a e i o u

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How to convert double[] to Double[] in Java?

How to convert double[] to List in Java?