📌 Project Name StringMethodPra

📌 Description

This project demonstrates the most commonly used methods of the Java String class.

The program explains how different String methods work with practical examples and output, making it very useful for Java beginners and students.

Java String is an immutable class, meaning once a String object is created, it cannot be changed. Any modification returns a new String object.

📌 Objectives

To understand Java String class methods

To learn how String manipulation works

To practice searching, comparison, and modification methods

To observe case-sensitive and case-insensitive behavior

📌 Topics Covered

1. Length & Character Methods

   length() – Returns the total number of characters in the string

   charAt(int index) – Returns the character at a specific index

2. Substring Methods

   substring(int beginIndex) – Returns substring from given index to end

   substring(int beginIndex, int endIndex) – Returns substring between indexes (endIndex - 1)

3. Modification Methods (Return New String)

   toUpperCase() – Converts string to uppercase

   toLowerCase() – Converts string to lowercase

   trim() – Removes leading and trailing spaces

   replace(char old, char new) – Replaces characters in string

Note: These methods do not modify the original string.

4. Checking Methods

   startsWith(String prefix) – Checks if string starts with given value

   endsWith(String suffix) – Checks if string ends with given value

✔ These methods are case-sensitive

5. Searching Methods

   indexOf(String) – Finds first occurrence (Left to Right)

   indexOf(String, fromIndex) – Starts search from specific index

   lastIndexOf(String, fromIndex) – Searches from Right to Left

6. Comparison Methods

   equals() – Compares content (case-sensitive)

   equalsIgnoreCase() – Compares content ignoring case

   == – Compares memory reference, not content

   compareTo() – Lexicographical comparison (Dictionary order)

   compareToIgnoreCase() – Comparison ignoring case

📌 compareTo() returns:

0 → Strings are equal

Positive value → First string is greater

Negative value → First string is smaller

📌 Key Learning Points

Java Strings are immutable

== should not be used for content comparison

equals() is preferred for value comparison

Case sensitivity affects many String methods

Every modification creates a new String object

📌 Technologies Used

Language: Java

IDE: NetBeans / Eclipse / IntelliJ

Package: stringmethodpra

📌 Suitable For

Java Beginners

BCA / MCA / B.Tech Students

College Assignments

Interview Preparation

GitHub Practice Projects

📌 Author

Ankit Sahu

Java Learner & Student