check string with delimiter expected

Question

I want to split string got from bluetooth. i'm using

StringTokenizer  splitStr = new StringTokenizer(readMessage, "\\|");
String numberSpeed = splitStr.nextToken();  //splitStr[0].replaceAll("\\D+","");
String numberTorque = splitStr.nextToken();  //splitStr[1].replaceAll("\\D+","");
numberSpeed = numberSpeed.replaceAll("\\D+","");
numberTorque = numberTorque.replaceAll("\\D+","");

Did it with split string before. If i get corupted data without delimiter the app crashes while trying to do impossible.

How to check if there is delimiter or not and then proceed split or skip it?

Waqar Ahmed · Accepted Answer · 2014-05-20T12:22:05.797

1

you can check for delimeter in string by contains() method

if(str.contains("_your_delimiter")) {   //for safe side convert your delimeter and search string to lower case using method toLowerCase()
     //do your work here
}

edited May 20 '14 at 12:22

answered May 20 '14 at 12:13

Waqar Ahmed

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`if(readMessage.contains("|")){ StringTokenizer splitStr = new StringTokenizer(readMessage, "\\|"); numberSpeed = splitStr.nextToken().replaceAll("\\D+",""); numberTorque = splitStr.nextToken().replaceAll("\\D+",""); }` still it tries to split it and crashes – Martynas May 20 '14 at 12:23
can you post the logcat. i mean to say which exception it throws. – Waqar Ahmed May 20 '14 at 12:24
It worked actually... Do not know what i changed, but it worked :D – Martynas May 20 '14 at 12:30
And how to check if string contains number? `if(str.contains("_your_delimiter && D+")) {`??? Sorry i dont know all these \\DD and so on commands... – Martynas May 20 '14 at 13:15
see here..this might help you what you want to do. see the accepted answer...http://stackoverflow.com/questions/18590901/check-if-a-string-contains-numbers-java – Waqar Ahmed May 20 '14 at 16:44

score 1 · Answer 2 · answered May 20 '14 at 12:15

Try this, I use it in my app.

String container = numberSpeed ;
String content = "\\D+";
boolean containerContainsContent = StringUtils.containsIgnoreCase(container, content);

It will return true if it has delimiter, and false it not.

Use that with an if statement. ex.

if(containerContainsContent){
//split it 
} else {
//skip it
}

RMachnik · Answer 3 · 2014-05-20T12:51:00.720

1

This is quote from tokenizer docs: StringTokenizer is a legacy class that is retained for compatibility reasons although its use is discouraged in new code.

Try to user String.split() instead.

if(str.contains(DEILIMITER)) {
     String tab[] = str.split(DEILIMITER);
    //enter code here

}

edited May 20 '14 at 12:51

answered May 20 '14 at 12:16

RMachnik

3,598
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check string with delimiter expected

3 Answers3