C#vs Java Enum(适用于C#的新手)
我已经用Java编程了一段时间,只是投入了一个完全用C#编写的项目。我正试图加快C#的速度,并注意到在我的新项目中几个地方使用的枚举,但乍一看,C#的枚举似乎比Java 1.5+实现更简单。任何人都可以枚举C#和Java枚举之间的差异,以及如何克服这些差异?(我不想开始语言火焰战,我只想知道如何在C#中做一些我以前用Java做的事情)。例如,有人可以发布一个C#对应的Sun着名的Planet枚举示例吗?
public enum Planet { MERCURY (3.303e+23, 2.4397e6), VENUS (4.869e+24, 6.0518e6), EARTH (5.976e+24, 6.37814e6), MARS (6.421e+23, 3.3972e6), JUPITER (1.9e+27, 7.1492e7), SATURN (5.688e+26, 6.0268e7), URANUS (8.686e+25, 2.5559e7), NEPTUNE (1.024e+26, 2.4746e7), PLUTO (1.27e+22, 1.137e6); private final double mass; // in kilograms private final double radius; // in meters Planet(double mass, double radius) { this.mass = mass; this.radius = radius; } public double mass() { return mass; } public double radius() { return radius; } // universal gravitational constant (m3 kg-1 s-2) public static final double G = 6.67300E-11; public double surfaceGravity() { return G * mass / (radius * radius); } public double surfaceWeight(double otherMass) { return otherMass * surfaceGravity(); }}// Example usage (slight modification of Sun's example):public static void main(String[] args) { Planet pEarth = Planet.EARTH; double earthRadius = pEarth.radius(); // Just threw it in to show usage // Argument passed in is earth Weight. Calculate weight on each planet: double earthWeight = Double.parseDouble(args[0]); double mass = earthWeight/pEarth.surfaceGravity(); for (Planet p : Planet.values()) System.out.printf("Your weight on %s is %f%n", p, p.surfaceWeight(mass));}// Example output:$ java Planet 175Your weight on MERCURY is 66.107583Your weight on VENUS is 158.374842[etc ...]
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