Converting String to "Character" array in Java

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I want to convert a String to an array of objects of Character class but I am unable to perform the conversion. I know that I can convert a String to an array of primitive datatype type "char" with the toCharArray() method but it doesn't help in converting a String to an array of objects of Character type.

How would I go about doing so?

Use this:

String str = "testString";
char[] charArray = str.toCharArray();
Character[] charObjectArray = ArrayUtils.toObject(charArray);

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Why not write a little method yourself

public Character[] toCharacterArray( String s ) {

   if ( s == null ) {
     return null;
   }

   int len = s.length();
   Character[] array = new Character[len];
   for (int i = 0; i < len ; i++) {
      /* 
      Character(char) is deprecated since Java SE 9 & JDK 9
      Link: https://docs.oracle.com/javase/9/docs/api/java/lang/Character.html
      array[i] = new Character(s.charAt(i));
      */
      array[i] = s.charAt(i);
   }

   return array;
}

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I hope the code below will help you.

String s="Welcome to Java Programming";
char arr[]=s.toCharArray();
for(int i=0;i<arr.length;i++){
    System.out.println("Data at ["+i+"]="+arr[i]);
}

It's working and the output is:

Data at [0]=W
Data at [1]=e
Data at [2]=l
Data at [3]=c
Data at [4]=o
Data at [5]=m
Data at [6]=e
Data at [7]= 
Data at [8]=t
Data at [9]=o
Data at [10]= 
Data at [11]=J
Data at [12]=a
Data at [13]=v
Data at [14]=a
Data at [15]= 
Data at [16]=P
Data at [17]=r
Data at [18]=o
Data at [19]=g
Data at [20]=r
Data at [21]=a
Data at [22]=m
Data at [23]=m
Data at [24]=i
Data at [25]=n
Data at [26]=g

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String#toCharArray returns an array of char, what you have is an array of Character. In most cases it doesn't matter if you use char or Character as there is autoboxing. The problem in your case is that arrays are not autoboxed, I suggest you use an array of char (char[]).

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Comments
  • What do you mean by "doesn't fit with the character array"?
  • Can you re-word this or articulate a bit more, or perhaps provide a code example?
  • To convert char to Character, use Character.valueOf(mychar). If it is an array, loop each element and convert.
  • java needs a map function, lambda expressions.
  • I wish ArrayUtils is standard in JVMs!
  • ArrayUtils is from commons-lang, not JDK, right?
  • Too many Character Objects will be instantiated if its a huge String.
  • Why not write a little method yourself? Because a method already exists (toCharArray()), and the method that already exists has far more engineers devoted to and interested in guaranteeing the performance and reliability of that function, than what may be copied/pasted from a stackoverflow post.
  • @HoldOffHunger You are absolutely right. However toCharArray() returns primitive type of array instead of Character object as need by OP. Sure, you can loop through the char[] again to convert it to Character[]. But, looping through a string ad creating Character object is so simple I don't see why not just roll your own if you don't want to bring in third party library.
  • This is not at all what the OP was asking for.
  • chaining is always best False.
  • ArrayUtils is not part of the JDK.