One,
Definition enumeration
Public enum grade {
A, B, C, D, F, INCOMPLETE
}
Second, traverse enumeration value
Public void ListGradeValues (PrintStream out) throws oException {
FOR (Grade G: grade.values ()) {
Out.println ("Allowed Value: '" G "'");
}
}
Third, using ENUM in Switch
Public void testswitchstatement (PrintStream out) throws oException {
Stringbuffer outputtext = new stringbuffer (student1.getfullname);
Switch (student1.getgrade ()) {
Case A:
OutputText.Append ("Excelled with a grade of a");
Break;
Case B: // Fall Through TO C
Case C:
OutputText.Append ("Passed with a grade of")
.append (student1.getgrade (). TOSTRING ());
Break;
Case D: // Fall Through To F
Case F:
OutputText.Append ("Failed with a grade of")
.append (student1.getgrade (). TOSTRING ());
Break;
Case INCOMPLETE:
OutputText.Append ("DID NOT COMPLETE THE CLASS.");
Break;
DEFAULT: OUTPUTTEXT.APpend ("HAS a grade of") .append (student1.getgrade (). Tostring ()); Break;
}
Out.println (outputText.toString ());
}
Fourth, joint use enumeration and collection
Public enum antstatus {
INITIALIZING,
Compiling,
Copying,
Jarring,
Zipping,
DONE,
Error
}
Public void Testenummap (PrintStream out) throws oException {
// Create a map with the key and a string message
Enummap
New enummap
// Initialize the Map
AntMessages.Put (Antstatus.Initializing, "Initializing Ant ...");
AntMessages.Put (AntStatus.comPiling, "Compiling Java Classes ...");
AntMessages.Put (Antstatus.copy, "Copying Files ...");
AntMessages.Put (Antstatus.jarring, "Jarring Up Files ...");
AntMessages.Put (AntStatus.zipping, "Zipping Up Files ..."); AntMessages.Put (AntStatus.done, "Build Complete.");
AntMessages.Put (AntStatus.Error, "Error Occurred.");
// Iterate and Print Messages
For (AntStatus Status: antstatus.values ()) {
Out.println ("For Status" Status ", Message IS:"
AntMessages.get (status);
}
}
Tiger takes the enumeration as a class, which can be from
Antstatus
Class objects have been proved that this object is not only available, but is actually used. In the final analysis, Tiger still regards enumeration as a special class type.
