Scientific Calculator (Java Swing)

Simple scientific calculator implemented in Java using Swing. Demonstrates event handling (ActionListener) and exception handling (try/catch).

Files

• src/Calculator.java

Build & Run (command line on Windows)

1. Open a terminal in the project root d:\hobby\calculator.
2. Compile:

javac -d out src\Calculator.java

3. Run:

java -cp out Calculator

Usage

• Click number buttons to enter values.
• Use +, -, *, / for arithmetic; press = to compute.
• Scientific functions (sin, cos, tan, log, sqrt, x^2, pi) apply immediately to the shown value.
• AC clears all state.

Exception handling

• Division by zero shows: "Error: Division by zero is not allowed"
• Invalid or empty input shows: "Invalid Input"
• Unexpected errors show a generic message; the app does not crash.

Notes

• Angles for trigonometric functions are interpreted in degrees.
• This is a compact educational example intended for learning event and exception handling.