Effective Java

// EnumSet - a modern replacement for bit fields
public class Text {
public enum Style { BOLD, ITALIC, UNDERLINE, STRIKETHROUGH }
// Any Set could be passed in, but EnumSet is clearly best
public void applyStyles(Set

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ITEM 37: USE ENUMMAP INSTEAD OF ORDINAL INDEXING
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Item 37: Use 
EnumMap
 instead of ordinal indexing
Occasionally you may see code that uses the 
ordinal
method (Item 35) to index
into an array or list. For example, consider this simplistic class meant to represent
a plant:
class Plant {
enum LifeCycle { ANNUAL, PERENNIAL, BIENNIAL }
final String name;
final LifeCycle lifeCycle;
Plant(String name, LifeCycle lifeCycle) {
this.name = name;
this.lifeCycle = lifeCycle;
}
@Override public String toString() {
return name;
}
}
Now suppose you have an array of plants representing a garden, and you want
to list these plants organized by life cycle (annual, perennial, or biennial). To do
this, you construct three sets, one for each life cycle, and iterate through the
garden, placing each plant in the appropriate set. Some programmers would do
this by putting the sets into an array indexed by the life cycle’s ordinal: