Java
Working with data types
A practical reference with examples you can run.
Introduction
Numbers, text, and true-or-false values behave differently. Adding numbers calculates a sum; combining strings joins text. Convert a value deliberately before using it in a calculation.
Syntax & example
public class Main {
public static void main(String[] args) {
int price = 12;
int quantity = 3;
System.out.println(price * quantity);
}
}Expected output
36
Common mistakes
- Using a variable before assigning a value to it.
- Mixing text and numbers without converting deliberately.
- Skipping an empty input or a boundary value when testing.
Practice
Store a price and a quantity, then calculate their product.
Main.javaYour ideas, in code.
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