So I am confused on if in Java enums can have functions. I am making a simple html editor and wanted to use enums to represent the html tags, yes I know this is not the best way to go about it but its the way my group decided to implement it.
So I have been trying to do something like this, but when I try to call TagEnums.normalTags()
it suggests making it a static method, I guess I am wondering if this is right or if there is a better way to implement it instead of making public ArrayList<String> normalTags()
into 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;
}
}
Yes, Java enums can have functions.
http://docs.oracle.com/javase/tutorial/java/javaOO/enum.html
Example from this page:
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));
}
}
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