Java program to remove new line character from the line

Question

I am having trouble removing new line character that appears in the line.

My input is:

1,john,a

2,smith,b

3,mike

,c

4,clark,d

My output should be:

1,john,a

2,smith,b

3,mike,c

4,clark,d

Below is the code I wrote so far. I am using "continue" to remove bad records based on count of expected "," in each line. However, I would like to concatenate the line where "\n" exists wrongly with the next line to get the line instead of removing as bad record.

String test="1,john,a\n2,smith,b\n3,mike\n,c\n4,clark,d";

String[] test2=test.split("\n");

int count=0;
String s="";
for(int i=0;i<=test2.length-1;i++)
{
    for(int j=0;j<test2[i].length();j++) {
        char c= test2[i].charAt(j);
        if(c==',') {
           count++;
           if(count<2) {
              continue;
           }
           System.out.println(test2[i]);
        }
    }
    count=0;    
}

Is your input guaranteed to have exactly three (desired) elements per line? — markspace
– markspace, Commented Jul 16, 2018 at 18:02
FYI: Any attempt at sanitizing poorly-formatted data after the fact is likely to be flaky. If your input is allowing newlines, are you really certain it's not allowing commas? How do you know "3,mike\n,c\n4,clark,d" means [[3,"mike","c"],[4,"clark","d"]] and not [[3,"mike\n,c,4,clark","d"]]? If at all possible, the best solution is to change the way these values are getting encoded in the first place. — StriplingWarrior
– StriplingWarrior, Commented Jul 16, 2018 at 18:12
Use a regular expression to replace any occurrence of \n, or ,\n with "" — Joakim Danielson
– Joakim Danielson, Commented Jul 16, 2018 at 18:13

markspace · Accepted Answer · 2018-07-16 18:42:31Z

4

If you always have exactly three elements per line, try splitting on both \n and , and then just combine three elements into one line.

String test="1,john,a\n2,smith,b\n3,mike\n,c\n4,clark,d";

String[] test2=test.split("[\n,]+");

for(int i=0;i<test2.length;i+=3)
{
   System.out.println(test2[i]+","+test2[i+1]+","+test2[i+2]);
}

edited Jul 16, 2018 at 18:42

answered Jul 16, 2018 at 18:12

markspace

11.1k3 gold badges28 silver badges44 bronze badges

Sign up to request clarification or add additional context in comments.

8 Comments

Rob Over a year ago

Could you just call text2.split() on the string? Won't this break on each newline without specifying the carriage? Just wondering, I dont have JDK on this machine and haven't used Java in some time.

StriplingWarrior Over a year ago

I don't think this works, as test.split("[\n,]"); will produce an empty string between "mike" and "c". See docs.oracle.com/javase/8/docs/api/java/lang/…

mohammed ahmed Over a year ago

@markspace Thanks fro the response. However, this code did not return the expected output

markspace Over a year ago

@StriplingWarrior I added a + after the bracket, works for me now. Sorry for posting untested code.

markspace Over a year ago

@mohammedahmed I added a + to the regex, try it now.

|

Ayush Gupta · Accepted Answer · 2018-07-16 18:32:57Z

-1

String test="1,john,a\n2,smith,b\n3,mike\n,c\n4,clark,d";

String[] test2=test.split("\n");

int count=0;
String s="";
for(int i=0;i<=test2.length-1;i++)
{
   String[] temp=test2[i].split(",");
   if(temp.length!=3){
     s=s+test2[i]+test2[i+1]+"\n";
     i++;
   }
else{
    s=s+temp[0]+","+temp[1]+","+temp[2]+"\n";
   }
}
 System.out.println(s);

answered Jul 16, 2018 at 18:32

Ayush Gupta

112 bronze badges

Comments

sandy.narwal · Accepted Answer · 2018-07-16 18:35:38Z

-1

I tried this:

String s="a,b,c\n";

while(s != null){ <<<<<-------Use the while condition as per your use case

    String[] var = s.split("\n");

    System.out.println(var[0]);
}

and it shows the desired result. You can split all the lines of the file similarly and get the desired output.

Output: a,b,c

Make sure to iterate the loop properly like buffer.readLine()

I hope it helps.

answered Jul 16, 2018 at 18:35

sandy.narwal

133 bronze badges

Collectives™ on Stack Overflow

Java program to remove new line character from the line

3 Answers 3

8 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

8 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related