java getting Last line(fastest way) from a String Variable

Question

I have a String Variable Contains lines of text

line1(Contains String)
line2(Contains String)
line3(Contains String)
line4(Contains String)

My requitement is to get a Last line of text?

Could any one help?

Read about StringReader: http://stackoverflow.com/questions/1096621/how-to-read-a-string-line-per-line — MariuszS, May 06 '13 at 06:49

score 16 · Accepted Answer · answered May 06 '13 at 06:50

16

paragraph.substring(paragraph.lastIndexOf("\n"));

answered May 06 '13 at 06:50

rajesh

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score 6 · Answer 2 · answered May 06 '13 at 06:49

// get the index of last new line character
int startIndex = str.lastIndexOf("\n");

String result = null;

// see if its valid index then just substring it to the end from that

if(startIndex!=-1 && startIndex!= str.length()){
  str.subString(startIndex+1);
}

score 4 · Answer 3 · answered May 06 '13 at 06:53

let say your string is like this

String s = "aaaaaaaaaaaaa \n bbbbbbbbbbbbbbb \n cccccccccccccccccc \nddddddddddddddddddd";

Now you can split it using

    String[] arr = s.split("\n");
    if (arr != null) {
        // get last line using : arr[arr.length - 1]
        System.out.println("Last    =====     " + arr[arr.length - 1]);
    }

score 2 · Answer 4 · answered May 06 '13 at 06:51

2

you can try

paragraph.substring(paragraph.lastIndexOf("\n"));

answered May 06 '13 at 06:51

Suresh Atta

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1

variable naming was a coincidence? :-) – rajesh May 06 '13 at 06:52
1

@rajesh cheers :) and that is exisiting line in my code too :) – Suresh Atta May 06 '13 at 06:52

score 1 · Answer 5 · answered May 06 '13 at 06:51

1

String[] lines = fileContents.split("\n"); String lastLine = lines[lines.length - 1];

this lastline variable would contain last line.

answered May 06 '13 at 06:51

Haseena

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score 0 · Answer 6 · answered May 06 '13 at 06:52

0

Example (slow solution)

String line = null;
Scanner scanner = new Scanner(myString);
while (scanner.hasNextLine()) {
  line = scanner.nextLine();
}

After this line is your last line.

answered May 06 '13 at 06:52

MariuszS

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java getting Last line(fastest way) from a String Variable

6 Answers6