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Modern Java: From Fundamentals to Advanced Architecture

Solution: Planetary Gravity Calculator

Explore how to implement a planetary gravity calculator in Java by declaring variables with type inference, applying formulas with floating-point math, and converting results with type casting. Understand how to manipulate data types, perform narrowing conversions, and format outputs for clear display in this practical lesson.

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Java 25
public class MarsWeightCalculator {
    public static void main(String[] args) {
        // 1. Use var for type inference
        var earthGravity = 9.81;
        var marsGravity = 3.73;
        var earthWeight = 85.5; 
        // 2. Calculate precise floating-point result
        // Formula: Weight * (MarsG / EarthG)
        double preciseMarsWeight = earthWeight * (marsGravity / earthGravity);
        // 3. Perform explicit narrowing cast
        // This drops the decimal part completely
        int displayWeight = (int) preciseMarsWeight;
        // 4. Output results
        System.out.println("Scientific Log: " + preciseMarsWeight);
        System.out.println("Cockpit Display: " + displayWeight);
    }
}
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