How to remove "all new line character" in a JAVA string

Question

I just want to remove everything after a new line in a JAVA string. For Example:- If String = "Class Name Address"

I want my output to be = "Class"

It is not a String Array it is one String with 3 lines

Help would be highly appreciated.

Split the string over newline, as described in the linked duplicate at the top of this page, and take the first element of the resulting array. — Robert Harvey, May 10 '19 at 18:11
Depending on OS end of line is a combination of `\n` and/or `\r`. — PM 77-1, May 10 '19 at 18:12

score 0 · Answer 1 · answered May 10 '19 at 18:17

Something like this?

public class Main {

  public static String firstLine(String s){
    if (s == null) return null;
    int cr = s.indexOf("\r");
    int nl = s.indexOf("\n");
    if (cr == -1 && nl == -1) return s;
    if (cr >= 0 && nl >= 0) return s.substring(0, Math.min(cr, nl));
    if (cr >= 0) return s.substring(0, cr);
    return s.substring(0, nl);
  }

  public static void main(String[] args){
    System.out.println(firstLine("line one"));
    System.out.println(firstLine("line one\r\nline two"));
    System.out.println(firstLine("line one\nline two"));
    System.out.println(firstLine("line one\r\nline two\r\nline three"));
    System.out.println(firstLine("line one\nline two\nline three"));
  }

}

Output is always: line one

Or a one line solution: `return s.split("\\r?\\n")[0];` – GBlodgett May 10 '19 at 18:54 — GBlodgett, May 10 '19 at 18:54

How to remove "all new line character" in a JAVA string

1 Answers1