Question

Can I read String Builder line by line? And Get the length of each line as well.

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EDIT:

“I build string in StringBuilder and add “\n” within. And I need to read it again. I need to consider that every “\n” has a new line.“

Answer 1

Given your edit, it’s as simple as invoking toString() on the StringBuilder instance, and then invoking split("\\n") on the returned String instance. And from there, you’ll have a String array that you can loop through to access each “line” of the StringBuilder instance. And of course, invoke length() on each String instance, or “line” to get its length.

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StringBuilder sb = new StringBuilder();
sb.append("line 1");
sb.append("\\n");
sb.append("line 2");

String[] lines = sb.toString().split("\\n");
for(String s: lines){
    System.out.println("Content = " + s);
    System.out.println("Length = " + s.length());
}