How Do C# Enums Compare to Java Enums for Developers Making the Switch?

C# vs. Java Enums: A comparison for developers migrating from Java to C#

For programmers migrating from Java to C#, it is critical to understand the differences in the enumeration capabilities of the two languages. Although C# enumerations initially appear simpler than Java enumerations, they provide unique capabilities that can be used to achieve the same or even more powerful results.

Main differences:

• Extension methods: C# allows the creation of extension methods on an enumeration, extending its functionality without modifying its original definition. This allows methods such as surfaceGravity() and surfaceWeight() to be added to the Planet enumeration.

Copy Java’s Planet enum in C#:

In C#, you can define a Planet enumeration and implement equivalent extension methods using custom properties or dictionaries.

Custom attribute method:

<code class="language-c#">[PlanetAttr(3.303e+23, 2.4397e6)]
public enum Planet
{
    MERCURY,
    VENUS,
    EARTH,
    // ... 其他行星
}</code>

The custom PlanetAttr attribute stores the mass and radius of each planet.

Extension methods:

<code class="language-c#">public static class Planets
{
    public static double GetSurfaceGravity(this Planet p)
    {
        // 使用自定义属性获取行星属性
        PlanetAttr attr = GetAttr(p);
        return G * attr.Mass / (attr.Radius * attr.Radius);
    }

    // ... 其他扩展方法
}</code>

Dictionary method:

<code class="language-c#">private static readonly Dictionary<Planet, double[]> planetData = new Dictionary<Planet, double[]>
{
    { Planet.MERCURY, new double[] { 3.303e+23, 2.4397e6 } },
    // ... 其他行星
};</code>

Using a dictionary you can retrieve mass and radius values ​​and calculate surface gravity similar to custom attribute methods.

By leveraging extension methods or dictionaries, you can implement the same functionality as Java enumerations in C#, allowing for seamless migration of code and concepts.

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