Java Char Array Appending Error

Question

In Java, I have been trying to append a string to a Char Array. I am using the code:

list = (new String(list) + word).toCharArray();

With list being the char array, and word being a string.

What am I doing wrong?

code is valid to do the toCharArray if list and word are String. — Juned Ahsan
– Juned Ahsan, Commented Oct 8, 2013 at 16:33

Mena · Accepted Answer · 2013-10-08 16:42:47Z

1

Make sure that:

list is char[] or byte[] (or String, StringBuilder, StringBuffer but that's a bit off-topic)
list != null

Explanation:

the String one-argument constructor only takes the types I've listed above
new String(null) is an ambiguous call to the String one-argument constructor
word can be any type, including a null object (in which case it will be represented as "null")

edited Oct 8, 2013 at 16:42

answered Oct 8, 2013 at 16:36

Mena

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1 Comment

Joe Over a year ago

Thanks - I was using a null string

Admit · Accepted Answer · 2013-10-08 16:35:26Z

0

what is the list type? Character[] or char[].

Since arrays are objects, they are not interchangeable.

For this situation list must be char[].

answered Oct 8, 2013 at 16:35

Admit

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Comments

Ajeesh · Accepted Answer · 2013-10-08 16:43:10Z

0

You could show us the exact error what you get. By using the below code I can get some output without any error.

    String word="hi";
    char[] list=null;
    if(list!=null)
        list = (new String(list) + word).toCharArray();
    else
        list = word.toCharArray();
    for(char ch: list)
    System.out.println("List: "+ch);

edited Oct 8, 2013 at 16:43

answered Oct 8, 2013 at 16:37

Ajeesh

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