How to split an array of strings into multiple strings?

Question

I am getting data from a Bluetooth characteristic in bytes and converting it into an array of floats that look like this:

[318.0159, 331.81818, 324.71603, 348.4345, 323.108, 3.2360008]

I want to be able to split this data into 6 strings,

"318.0159" "331.81818" "324.71603" "348.4345" "323.108" "3.2360008".

I have already tried to do this:

EDIT(charData initialized like so):

final StringBuilder stringBuilder = new StringBuilder(bytes.length);
for (byte byteChar : bytes)
    stringBuilder.append(String.format("%02X ", byteChar));
String charData = stringBuilder.toString();
String[] data = charData.split(",");
System.out.println(data[1]);
System.out.println(data[2]);
System.out.println(data[3]);
System.out.println(data[4]);
System.out.println(data[5]);
System.out.println(data[6]);

but when it tries to print the first data point, I get the exception:

Unhandled exception in callback
java.lang.ArrayIndexOutOfBoundsException: length=1; index=1

Thanks in advance for the help!!

Did you try to print charData before splitting it? Do it and see if it is like the array you posted in your question. — user8959091
– user8959091, Commented Aug 2, 2018 at 15:36
You built a string with no commas in it, then called split(",") on it. Also, there are no float values in your code. — VGR
– VGR, Commented Aug 2, 2018 at 15:52

xingbin · Accepted Answer · 2018-08-02 15:29:08Z

2

You need remove [ and ] first, and the array index ranges [0, 5]:

String charData = "[318.0159, 331.81818, 324.71603, 348.4345, 323.108, 3.2360008]";
charData = charData.replace("[", "").replace("]", "");

String[] data = charData.split(",");
System.out.println(data[0]);
System.out.println(data[1]);
System.out.println(data[2]);
System.out.println(data[3]);
System.out.println(data[4]);
System.out.println(data[5]);

output:

To avoid the leading white spaces, you can split with regex:

String[] data = charData.split(",\\s*");

output:

answered Aug 2, 2018 at 15:29

xingbin

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1 Comment

Rupesh Agrawal Over a year ago

It doesnt seems to be issue with data[6] because error is not java.lang.ArrayIndexOutOfBoundsException: index=6

Petro · Accepted Answer · 2018-08-02 15:34:59Z

2

Sun's answer is spot on, I prefer to trim input as well:

charData= charData.replace("[", "").replace("]", "");
String[] data = charData.split(",");
for(int x=0;x<=data.length;x++){
    String data_cleaned = data[x].trim();
    System.out.println(data_cleaned);
 }

answered Aug 2, 2018 at 15:34

Petro

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2 Comments

alakh125 Over a year ago

Your answer worked very well for me as well, thanks for the help!

Petro Over a year ago

Glad I could help :)

xingbin · Accepted Answer · 2018-08-02 15:50:29Z

1

try this

String[] data = ["318.0159", "331.81818", "324.71603", "348.4345", "323.108", "3.2360008"]
for (int i = 0; i < data.size(); i++) {
     System.out.println(data[i]);
}

ArrayIndexOutOfBoundsException occurs when you access some sort of array but the index is not available. also remember that an array starts from 0

edited Aug 2, 2018 at 15:50

xingbin

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answered Aug 2, 2018 at 15:33

Jason

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Comments

Rupesh Agrawal · Accepted Answer · 2018-08-02 15:39:33Z

0

It seems your charData don't have any data,
It is not same as you have asked in querstion.
Please print the data before split()
Also check data in bytes before your for (byte byteChar : bytes)

Also it is not the issue of array index o to 5 as others suggested, other wise error would have been java.lang.ArrayIndexOutOfBoundsException: index=6

answered Aug 2, 2018 at 15:39

Rupesh Agrawal

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