How to concatenate two char arrays in java ?
char info[]=new char[10]; char data[]=new char[10]; char result[]=new char[40]; I need to concatenate info and data, and store the concatenation in result:
result=info+data;
How to do this?
- 2stackoverflow.com/questions/80476/…Peter Jaloveczki– Peter Jaloveczki2013-06-12 08:32:12 +00:00Commented Jun 12, 2013 at 8:32
- docs.oracle.com/javase/6/docs/api/java/nio/CharBuffer.htmlFildor– Fildor2013-06-12 08:32:33 +00:00Commented Jun 12, 2013 at 8:32
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3 Answers
It depends I guess. The simpler approach would be just to convert the char arrays to a String and concaternate the Strings.
A better approach would be to use StringBuilder
char info[] = new char[10]; char data[] = new char[10]; // Assuming you've filled the char arrays... StringBuilder sb = new StringBuilder(64); sb.append(info); sb.append(data); char result[] = sb.toString().toCharArray(); 6 Comments
assylias
If he wants the output as a string that is a nice approach.
Aleks G
I don't think you want to append
result. He says he wants result = info + data. In your case, the last line should be result = sb.toString().toCharArray();
MadProgrammer
@assylias Yeah I thought that to, I also thought that
sb.toString().toCharArray() to get the character array back. This of course assumes the OP wants to only use char arrays ;)MadProgrammer
@AleksG Ah, that's true, missed that. Thanks
MadProgrammer
Love down votes without comment, makes me all warm and fuzzy inside :P
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try this
char result[] = new char[info.length + data.length]; System.arraycopy(info, 0, result, 0, info.length); System.arraycopy(data, 0, result, info.length, data.length); 
Comments
Just found one-line solution from the old Apache Commons Lang library: ArrayUtils addAll()
