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Students will gain in-depth knowledge of string manipulation in Java. They will learn various methods to create, modify, and analyze strings, which are fundamental to many programming tasks.
By the end of this unit, students will be able to perform complex string operations and understand the basics of regular expressions, enabling them to handle text processing tasks effectively.
Each lesson in this unit follows the same structure:
- Read the concept
- Study the example
- Write or modify Java code
- Compile the program
- Run the code
- Review the output
- Complete a hands-on lab
- Answer review questions
String creation and initialization
A String in Java is an object that represents a sequence of characters. Strings can be created using string literals, which are stored in the String Pool, or using the new keyword, which creates a new object in heap memory. Understanding how Java stores strings internally helps students avoid common comparison mistakes and write more efficient code.
String methods and operations
Java provides a rich set of built-in String methods. Students will practice using methods to find the length of a string, extract substrings, search for characters and substrings, replace text, convert case, remove leading and trailing whitespace, and split a string into an array. These methods are used constantly in real-world Java applications.
StringBuilder and StringBuffer classes
Strings in Java are immutable, meaning their value cannot be changed after creation. Every time a string appears to change, a new object is created. For programs that perform many string modifications, this can be inefficient. StringBuilder provides a mutable alternative and is the standard choice for building strings dynamically. StringBuffer is similar but thread-safe, making it appropriate for multi-threaded environments.
Regular expressions basics
A regular expression is a pattern used to search, match, and manipulate text. Java supports regular expressions through the Pattern and Matcher classes. Students will learn to write basic patterns, test whether a string matches a pattern, and extract matching content from text.
This unit is included in all academic level tracks.
| Academic Level | Track |
|---|---|
| High School | Units 1–7 |
| College / University — Year 1 | Units 1–8 |
| College / University — Year 2 | Units 1–11 |
| College / University — Year 3 | Units 1–13 |
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