CODEWITHSUNDEEP
javaforeachcharacter
Tribhuwan Chandra
Tribhuwan Chandra

Reputation: 51

for each loop is applied on a char array and iteration is done using a Character

I have found this program in which the for each loop is applied on a char array and iteration is done using a Character...Please explain me how it is happening??...I thought that the iteration can only be done using a char..

class Print{

    public static void main(String args[]) {
        printCharacters("Java");

    }
    public static void printCharacters(String word) {
        char[] characters = word.toCharArray();
        for (Character ch : characters) {
         System.out.println(ch);   
        }

    }

}

Output:

J

A

V

A

Upvotes: 1

Views: 1631

Answers (2)

crysxd
crysxd

Reputation: 3490

char is a simple data type in Java, it is not an object like a String. Every simple data type has a wrapper class to use it like an object (this is needed in some situations like when using an ArrayList which only can store objects and no primetives like char). The wrapper class for char is Character, int is wrapped by Integer, long by Long, float by Float and double by the Double class.

In this special case there is no need to wrap the char with an Character instance!

Upvotes: 0

Nir Alfasi
Nir Alfasi

Reputation: 53525

I'm not sure why all the downvotes, that's a legit question!

You actually had a good catch here, since the array is defined using a primitive char the iteration in the for-loop should do the same:

for (char ch : characters) {
    System.out.println(ch);   
}

Unless we have a good reason to do autoboxing and create a Character object - this overhead is not needed (and it's actually a hit in performance and a waste of memory in the heap as well).

An example for such a "good reason" is when we want to use generics which doesn't work with primitive types. However, this is not the case here.

Upvotes: 4

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