Lisa's notes: musings on daily life, work, study, personal growth, and casual reflections.
This tutorial walks through Java class fundamentals, covering class declarations, modifiers, member variables, methods, method overloading, and constructors with clear syntax examples and code snippets to help beginners write and understand Java classes.
This tutorial‑style note walks through Python’s pass statement, the mechanics of while and for loops (including nested loops and common pitfalls), the use of break and continue, and a comprehensive overview of string creation, slicing, case conversion, searching, replacement, and encoding, all illustrated with concrete code examples and expected outputs.
This article explains the fundamentals of object‑oriented programming in Java, covering objects, classes, inheritance, encapsulation, polymorphism, and packages with concrete examples that illustrate how real‑world concepts map to Java code and how objects interact through message passing.
This note demonstrates how Python encodes and decodes Unicode strings using utf-8 and GBK, and how the chr() and ord() functions convert between characters and their ASCII codes, with concrete code examples and output illustrations.
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.
