String literal with toCharArray() producing garbage in Java

Question

I wanted to create a char array of the alphabet. I looked at this post:

Better way to generate array of all letters in the alphabet

which said this:

char[] alphabet = "abcdefghijklmnopqrstuvwxyz".toCharArray();

So in my code I have:

public class Alphabet {

private char[] letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".toCharArray();

public String availableLetters(){

    return letters.toString();
   } 

}

When I call the function availableLetters() from main() and printit to the console, it outputs this garbage:

[C@15db9742

What am I doing wrong?

garbage(Java) producing garbage. That's called productive garbage. — Aniket Inge
– Aniket Inge, Commented Apr 30, 2016 at 4:23

Sergey Kalinichenko · Accepted Answer · 2016-04-30 04:31:05Z

5

The array is correct, the problem is that you are not printing it correctly.

If you print your array one character at a time, you would get a correct result:

for (char c : letters) {
    System.out.print("'" + c + "' ");
}

demo

Unfortunately, Java standard class library does not provide a meaningful override of toString() for arrays, causing a lot of trouble for programmers who are new to the language.

edited Apr 30, 2016 at 4:31

answered Apr 30, 2016 at 4:21

Sergey Kalinichenko

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Comments

Michael Markidis · Accepted Answer · 2016-04-30 04:32:44Z

If you want to print it in array form, then use:

System.out.println(Arrays.toString(letters));

BTW: The [C@15db9742 is not really garbage. It's what gets printed out when a class does not override the toString() method.

From Object.toString():

Returns a string representation of the object. In general, the toString method returns a string that "textually represents" this object. The result should be a concise but informative representation that is easy for a person to read. It is recommended that all subclasses override this method. The toString method for class Object returns a string consisting of the name of the class of which the object is an instance, the at-sign character `@', and the unsigned hexadecimal representation of the hash code of the object. In other words, this method returns a string equal to the value of:

getClass().getName() + '@' + Integer.toHexString(hashCode())

klog · Accepted Answer · 2016-04-30 04:23:57Z

-1

You can pass the char array to the String constructor or the static method String.valueOf() and return that instead.

answered Apr 30, 2016 at 4:23

klog

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