Java substring with line break

Question

Let's say I have a string:

String pers = "PROCESS / PROGRAM / PROJECT / SERVICE DELIVERY";

How do I break line when the string's length reaches 30? So it will result in:

PROCESS / PROGRAM / PROJECT /

SERVICE DELIVERY

My attempt:

String pers = "PROCESS / PROGRAM / PROJECT / SERVICE DELIVERY";
if (pers.length() > 30) {
  pers = pers.substring(0, 30) + "\n" + pers.substring(30, pers.length());
}

It returns Uncaught SyntaxError: Invalid or unexpected token at the browser's console. Please help.

Where do you use this code. Works fine when i run in eclipse IDE. — pavithraCS, Aug 08 '18 at 06:26
What is the full stacktrace for your error? What line does the error point to? Please read the [ask] article... — Zephyr, Aug 08 '18 at 06:27
*Uncaught SyntaxError: Invalid or unexpected token* is not being thrown from this code. Please post the stacktrace — Scary Wombat, Aug 08 '18 at 06:28
I guess I know why. The error is from GoJS library. Let me debug it. — Brian Cheong, Aug 08 '18 at 06:29
The code you posted is fine. Try to clean, rebuild your program. If there are still errors, post the full stacktrace. — user3437460, Aug 08 '18 at 06:29
*The error is from GoJS library* - you are better off to delete this question — Scary Wombat, Aug 08 '18 at 06:30
I would suggest not saying "browsers console" as most people associate that with JavaScript instead of Java, and people may downvote your question because those 2 things get confused very often. — Ferrybig, Aug 08 '18 at 06:38
duplicate of https://stackoverflow.com/questions/9276639/java-how-to-split-a-string-by-a-number-of-characters — Scary Wombat, Aug 08 '18 at 07:02

score 1 · Answer 1 · answered Aug 08 '18 at 06:28

1

You could use something like so:

String pers = "PROCESS / PROGRAM / PROJECT / SERVICE DELIVERY";
String formattedString = pers.replaceAll("(.{30})", "$1\n");

The above should replace 30 characters with whatever is matched plus a new line character.

answered Aug 08 '18 at 06:28

npinti

51,780
5
72
96

score 0 · Answer 2 · answered Aug 08 '18 at 06:50

A StringBuilder would probably be an easier way to work with string manipulation. You can try this also using String Builder.

String s = "A very long string containing " +
    "many many words and characters. " +
    "Newlines will be entered at spaces.";

StringBuilder sb = new StringBuilder(s);

int i = 0;
while ((i = sb.indexOf(" ", i + 30)) != -1) {
    sb.replace(i, i + 1, "\n");
}

System.out.println(sb.toString());

If you know about Regular Expressions then this is the best and easiest way:-

String str = "....";
String parsedStr = str.replaceAll("(.{30})", "$1\n");

This will replace every 30 characters with the same 30 characters and add a new line at the end.

score 0 · Answer 3 · answered Aug 08 '18 at 06:53

Try this one:

public ArrayList gecStringFromStringByNumberOfChars(String str, int numberOfChars) {

int numberOfLine = str.length() / numberOfChars;
int offsets = str.length() % numberOfChars;
ArrayList<String> result = new ArrayList<>();
for (int i = 0; i < numberOfLine; i++) {
    result.add(str.substring(i * numberOfChars, i * numberOfChars + numberOfChars));
}
if (offsets > 0) {
    result.add(str.substring(str.length() - offsets, str.length()));
}
return result;
}

in code call it gecStringFromStringByNumberOfChars(pers,30)

Java substring with line break

3 Answers3