Java String Methods Explained | equals vs ==, replace(), substring() & Immutability
on channel: The Study Room Journal
This tutorial covers the most essential Java String methods used in real-world programming. You’ll learn how to measure, transform, search, compare, and manipulate text, along with a clear explanation of String immutability and how it affects memory and performance.
Special attention is given to common pitfalls such as using == instead of .equals(), so you can write correct, efficient, and reliable Java code.
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Relevant Resources & Code
String Methods Code
https://github.com/TheStudyRoomJourna...
String Basics (Immutability and Internal Behavior)
https://github.com/TheStudyRoomJourna...
StringBuilder (Performance Optimization)
https://github.com/TheStudyRoomJourna...
Methods (Using String Logic in Reusable Code)
https://github.com/TheStudyRoomJourna...
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Timestamps
00:00:10 Introduction to string methods
00:00:47 Core operations overview
00:01:05 Measuring length with length()
00:01:39 Case conversion (toUpperCase(), toLowerCase())
00:02:06 Searching text (contains(), substring())
00:03:24 Comparing strings (equals() vs ==)
00:03:35 Replacing text (replace(), replaceAll())
00:04:18 Immutability explained
00:05:29 Practice challenge
00:06:06 Real-world usage
00:06:19 Transition to performance considerations
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Key Technical Insights
String is immutable, so every modification returns a new object
== compares references, while equals() compares actual content
replaceAll() uses regular expressions, while replace() does not
Frequent string modifications can lead to performance overhead
Prefer StringBuilder for repeated or loop-based operations
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