Lisa's notes: musings on daily life, work, study, personal growth, and casual reflections.
This tutorial walks through two Java examples—a simple Caesar‑style encryption/decryption program that shifts letters by four positions and a nested‑loop implementation of the 9×9 multiplication table—explaining the logic, code, and output step by step.
This tutorial explains Python's str.replace method—including its three parameters and usage examples—and demonstrates common boolean string checks such as isupper, islower, isdigit, istitle, and isalpha with concrete code snippets and their outputs.
This tutorial demonstrates how to use Python's strip, lstrip, rstrip, split, and join functions to remove characters, divide strings, and concatenate elements, providing code snippets and the corresponding output for each operation.
This tutorial explains Java's jump statements—break, continue, and the labeled break—showing their syntax, how they affect single and nested loops, and best‑practice considerations through concrete code examples and execution results.
This tutorial demonstrates how to use Python's built-in string functions to obtain a string's length, count occurrences of a substring, convert case, and locate substrings using find, index, and rfind, with concrete code examples and expected outputs.
This article explains Java's loop constructs—including while, do‑while, for, nested loops, foreach, and bubble‑sort implementations—through detailed syntax descriptions, step‑by‑step execution processes, and multiple concrete code examples with expected outputs.
This tutorial walks through Java's selection structures—including if, if‑else, if‑else‑if, nested if, and switch—detailing their syntax, execution flow, example code, output results, and key differences, helping beginners write correct and portable conditional logic.
This tutorial explains Python's string indexing and slicing, covering zero‑based indices, the start:end:step syntax, negative indices, step rules, and multiple concrete examples that demonstrate how to extract and manipulate substrings.
This tutorial walks through Java 2D arrays, covering their definition, variable declaration syntax, creation with the new keyword, direct initialization, element access, and modification, illustrated with code examples and visual tables.
This note explains how to declare Python strings with various quotes, embed quotes inside strings, use escape sequences, and apply raw strings and f‑strings, providing clear code snippets and their outputs for each case.
