trim() does not working

Question

String m1 = nextLine[6]; //"9602612325 "
m1 = m1.trim();                                  
if(m1 != null && !m1.isEmpty()){
      mob1 = Double.parseDouble(m1);
}else{
      mob1 = 0; 
}

I am trying to remove the space in

String m1 = "9602612325 ";

I've gone through the following links string trim function and string pool but still couldn't find the answer. Can anyone help me?

Not really, since we have no idea *how* it's not working for you. You'll need to elaborate. — Dragondraikk, Jun 01 '15 at 13:10
One problem: you're calling `m1.trim()` *before* you've done your null test. — Phylogenesis, Jun 01 '15 at 13:11
actually the number "9602612325 " is ending with space, how can i remove that? — User, Jun 01 '15 at 13:12
Sometimes, there is a case, it may not be the `space`, rather could be `non-breakable space`, `n space`, `m space` etc., In wich the `trim()` will not work for some characters. Make sure the last character is space. — Vinod Kumar, Jun 01 '15 at 13:13
@VinodKumar m1.string.replace("\u00A0",""); this line solved my problem. thanks all. — User, Jun 01 '15 at 13:26
Very well, that is a `non-breakable space`. Let me add an answer for it. — Vinod Kumar, Jun 01 '15 at 13:29

score 1 · Answer 1 · answered Jun 01 '15 at 13:18

1

Try this :

String m1 = "9602612325 ";
if(! Strings.isNullOrEmpty(m1)){ // Google Guava's utility class --> Strings
     m1 = m1.trim();
     try{
      mob1 = Double.parseDouble(m1);
      }
     catch(NumberFormatException e){
       mob1=0;
      }
}
else{
    mob1=0;
}

Note : You can also check manually for null and empty like this

if("".equals(m1)){    // here you need not to check for null seperately
 //do Whatever you need to do 
}

answered Jun 01 '15 at 13:18

Neeraj Jain

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1

I liked the **"".equals(m1)** <-- never thought about it :) – nafas Jun 01 '15 at 13:20
1

@nafas it is example of [yoda conditions](http://en.wikipedia.org/wiki/Yoda_conditions). – Pshemo Jun 01 '15 at 13:23

score 1 · Accepted Answer · answered Jun 01 '15 at 13:39

Sometimes, there is a case, it may not be the space, rather could be non-breakable space, n space, m space etc., In wich the trim() will not work for some characters. Make sure the last character is space.

If the last character is not space, then you could write your own logic to do that.

String text = " my text ";
char[] trimChars = {'\u00A0', ' '};//Add anything else you like to trim.
bool isSpaceBefore = false, isSpaceAfter = false;
do {
    isSpaceAfter = false;
    isSpaceBefore = false;
    for(int c=0; c<trimChars.length; c++) {
        isSpaceBefore = text.indexOf(trimChars[c]) == 0;
        isSpaceAfter = text.lastIndexOf(trimChars[c]) == text.length-1;
    }
    if(isSpaceAfter) text = text.substring(0, text.length-1);
    if(isSpaceBefore) text = text.substring(1);
}
while(isSpaceBefore || isSpaceAfter);

as a simplified version, you could use a find and replace also. But note that the replace will replace any characters that match even if they are in the middle of the string.

trim() does not working

2 Answers2