String indent(count) – Left indent lines in Java

Lokesh Gupta

Learn to indent (left indentation) a string(s) in Java using String.indent() API. This api has been introduced in Java 12.

1. String.indent(count) API

This method adjusts the indentation of each line of a given string based on the value of count, and normalizes line termination characters.

* count - number of leading white space characters to add or remove
* returns - string with indentation adjusted and line endings normalized
public String indent​(int count)

Note that the value of count can be either positive or nagative number.

  • positive number – If count > 0 then spaces are inserted at the beginning of each line.
  • negative number – If count < 0 then spaces are removed at the beginning of each line.
  • negative number – If count > available white spaces then all leading spaces are removed.

Each white space character is treated as a single character. In particular, the tab character “\t” is considered a single character; it is not expanded.

2. String.indent​() Example

Java program to white strings into file indented to 8 characters.

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.StandardOpenOption;

public class Main 
	public static void main(String[] args) 
			Path file = Files.createTempFile("testOne", ".txt");

			//Write strings to file indented to 8 leading spaces
			Files.writeString(file, "ABC".indent(8), StandardOpenOption.APPEND);
			Files.writeString(file, "123".indent(8), StandardOpenOption.APPEND);
			Files.writeString(file, "XYZ".indent(8), StandardOpenOption.APPEND);	

			//Verify the content
			Stream<String> lines = Files.lines(file);

		catch (IOException e) 

Program output.


Drop me your questions related to reading a file into lines of stream.

Happy Learning !!

Ref : Java doc


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