Understanding float and double in Java

Java Development (13 Part Series)

1 Getting Back to Java: A Journey Through One of the Most Versatile Languages
2 How to Set Up Your Environment to Start Java Development
… 9 more parts…
3 IntelliJ IDEA on Ubuntu: Begin Your Journey into Java Development!
4 Your First Java Project in IntelliJ IDEA: Creating a “Hello World” in Java
5 Exploring Classes and the Main Method in Java
6 Exploring Class Organization with Packages in Java
7 Variables and Data Types in Java
8 Understanding float and double in Java
9 Types: char and boolean
10 Exploring Non-Primitive Types in Java: A Dive into Object-Oriented Programming
11 Understanding Strings and Arrays in Java
12 Exploring the for Loop in Java
13 Exploring While and DoWhile in Java: Master Loop Structures with Practical Examples

When diving deeper into Java’s data types, it’s essential to understand float and double. These are floating-point data types used for real numbers, allowing for precision in handling both tiny and massive values.

float: Compact and efficient, perfect for lightweight tasks. It requires adding an f at the end of the number to explicitly mark it as a float.
double: As the name suggests, it has double the precision of float, making it ideal for complex calculations and scenarios where precision matters.

Key Points:

Java interprets a number like 1.5 as double by default. To use a float, append an f (e.g., 1.5f).
float stores fewer decimal places than double, which is better for high-precision needs.

Example with float:

public class FloatExample {
    public static void main(String[] args) {
        float numA = -101.23f;
        float numB = 2.356f;
        System.out.println(numA + numB); // Output: -98.874
    }
}

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Example with double:

public class DoubleExample {
    public static void main(String[] args) {
        double valueOne = 0.5; // Implicitly a double
        double valueTwo = 0.5d; // Explicitly a double
        double valueThree = 0.123456789; // High precision
        System.out.println(valueOne);    // Output: 0.5
        System.out.println(valueTwo);    // Output: 0.5
        System.out.println(valueThree);  // Output: 0.123456789
    }
}

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Why Choose One Over the Other?

Choose float when memory is limited and calculations are less precise.
Choose double for scientific calculations or applications needing high precision.

Java Development (13 Part Series)

原文链接：Understanding float and double in Java

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