ICSE Class 10 Java | String Handling Lecture 5: Practice Programs & Function Logic

MASTER ICSE JAVA: WRITING STRING STATEMENTS (LECTURE 5)

Welcome to Lecture 5 of our String Handling series! In this session, we move from predicting outputs to a more challenging task: writing precise Java statements from English descriptions. This is a high-scoring section in the ICSE Class 10 Computer Applications Board Exam (Syllabus 2025-2026).

In this video, we go through how to translate logical requirements—like "extracting the last three characters"—into syntactically correct Java code. We also discuss why certain String methods are "overloaded."

📌 WHAT YOU WILL LEARN IN THIS SESSION:

Specific Extraction: Accessing the 3rd character and the last character dynamically.

Substring Logic: Extracting the first "n" or last "n" characters using the length() method.

Boolean Assignment: Using startsWith() and equals() to store results in variables.

Comparison Logic: Knowing when to use 'int' (compareTo) vs. 'boolean' (equals).

Data Conversion: Using String.valueOf() for numeric-to-string transformation.

Method Overloading: Understanding why Java provides multiple versions of the same function.

🕒 TIMESTAMPS:
00:00 Introduction to Lecture 5
00:28 Pro-Tip: Pause, solve, and then watch the discussion!
01:10 EXERCISE START: Translating English to Java Statements
01:26 (a) Printing the 3rd character (Index 2 logic)
03:56 (b) Printing the last character using s.length()
07:12 (d) Extracting the last three characters (Length - 3 logic)
08:32 (e) Checking startsWith() and assigning to a boolean variable
09:52 (f) Finding the last occurrence of a character ('P')
10:51 (g) Equals vs. CompareTo Part 1: Storing boolean results
11:43 (h) Equals vs. CompareTo Part 2: Storing integer results
12:36 (i) Numeric to String conversion using valueOf()
13:20 (j) Replacing character variables (Avoiding the single-quote trap)
14:43 THEORY BONUS: Why is indexOf() an overloaded method?
16:02 Outro: Get ready for BlueJ Programming in Lecture 6!

💡 KEY EXAM TAKEAWAYS:

INDEX MATH: Remember that the "n-th" character is always at index "n - 1".

VARIABLE VS LITERAL: In the replace(C1, C2) method, never put variable names in single quotes. Only literal characters like 'A' or 'z' need quotes.

METHOD OVERLOADING: A method is overloaded if it has the same name but different parameters. For example, indexOf() can take a char or a String.

🔔 DON'T MISS THE NEXT CLASS! The theory and short exercises are now complete. Starting from Lecture 6, we will open BlueJ and begin writing FULL-LENGTH STRING PROGRAMS as they appear in Section B of the board paper.

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