Question

How to wrap a string into lines of width w in Java

Answer 1

/**
    This program wraps a string into lines of maximum width `w`.

    Method:
    - Use String.split() to break the text into words.
    - Build each line until adding another word would exceed the width.
    - When the limit is reached, store the line and begin a new one.
    - Uses standard library features such as StringBuilder for efficient concatenation.
*/

public class WrapTextProgram {

    // Function that wraps text into lines of width w
    public static String wrapText(String text, int w) {
        String[] words = text.split("\\s+");  // Split on whitespace
        StringBuilder line = new StringBuilder();
        StringBuilder result = new StringBuilder();

        for (String word : words) {

            // If line is empty, start it with the word
            if (line.length() == 0) {
                line.append(word);
            }
            else {
                // Check if adding the next word exceeds width
                if (line.length() + 1 + word.length() <= w) {
                    line.append(" ").append(word);
                } else {
                    // Store the completed line
                    result.append(line).append("\n");
                    line.setLength(0);  // Clear the line
                    line.append(word);
                }
            }
        }

        // Add the final line
        if (line.length() > 0) {
            result.append(line);
        }

        return result.toString();
    }

    public static void main(String[] args) {
        String sample =
            "Java provides useful built-in tools for handling strings. "
          + "This program demonstrates how to wrap text cleanly and efficiently.";

        String wrapped = wrapText(sample, 35);
        System.out.println(wrapped);
    }
}


/*
run:

Java provides useful built-in tools
for handling strings. This program
demonstrates how to wrap text
cleanly and efficiently.

*/

 

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Answer 2

public class WrapTextProgram {
 
    public static String wrapText(String text, int width) {
        StringBuilder sb = new StringBuilder();
        int lineLen = 0;
    
        for (String word : text.split(" ")) {
            if (lineLen + word.length() > width) {
                sb.append("\n");
                lineLen = 0;
            }
            sb.append(word).append(" ");
            lineLen += word.length() + 1;
        }
        return sb.toString().trim();
    }

 
    public static void main(String[] args) {
        String sample =
            "Java provides useful built-in tools for handling strings. "
          + "This program demonstrates how to wrap text cleanly and efficiently.";
 
        String wrapped = wrapText(sample, 35);
        System.out.println(wrapped);
    }
}
 
 
/*
run:
 
Java provides useful built-in tools 
for handling strings. This program 
demonstrates how to wrap text 
cleanly and efficiently.
 
*/

 

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