因此,我对Java枚举中是否可以包含函数感到困惑。我正在制作一个简单的html编辑器,并希望使用枚举来表示html标签,是的,我知道这不是解决问题的最佳方法,而是我小组决定实现它的方法。
所以我一直在尝试做这样的事情,但是当我试图称其TagEnums.normalTags()为静态方法时,我想我想知道这是否正确,或者是否有更好的方法来实现它而不是公开ArrayList<String>normalTags()成为public static ArrayList<String> normalTags()
TagEnums.normalTags()
ArrayList<String>normalTags()
public static ArrayList<String> normalTags()
public enum TagEnum { H1, H2, H3, H4, H5, H6, P, B, I, U, BR, HR, RP, RT, RUBY public ArrayList<String> normalTags(){ String normalTags = "H1, H2, H3, H4, H5, H6, P, B, I, U"; ArrayList<String> tags = new ArrayList<String>(); for(Enum<?> currentEnum: TagEnum.values()){ if(normalTags.contains(currentEnum.toString())){ tags.add("<"+currentEnum.toString().toLowerCase()+">"); tags.add("</"+currentEnum.toString().toLowerCase()+">"); } } return tags; } }
是的,Java枚举可以具有功能。
http://docs.oracle.com/javase/tutorial/java/javaOO/enum.html
此页面上的示例:
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); private final double mass; // in kilograms private final double radius; // in meters Planet(double mass, double radius) { this.mass = mass; this.radius = radius; } private double mass() { return mass; } private double radius() { return radius; } // universal gravitational constant (m3 kg-1 s-2) public static final double G = 6.67300E-11; double surfaceGravity() { return G * mass / (radius * radius); } double surfaceWeight(double otherMass) { return otherMass * surfaceGravity(); } public static void main(String[] args) { if (args.length != 1) { System.err.println("Usage: java Planet <earth_weight>"); System.exit(-1); } double earthWeight = Double.parseDouble(args[0]); double mass = earthWeight/EARTH.surfaceGravity(); for (Planet p : Planet.values()) System.out.printf("Your weight on %s is %f%n", p, p.surfaceWeight(mass)); } }