enum Day {
MON("Monday"), TUE("Tuesday"), WED("Wednesday"), THU("Thursday"), FRI("Friday"), SAT("Saturday"), SUN("Sunday");
String day;
Day(String d) {
day = d;
}
String getDay() {
return day;
}
void setDay(String d) {
this.day = d;
}
public static Day fromValue(String value) {
for (Day type : Day.values()) {
if (type.getDay().equals(value)) {
return type;
}
}
throw new IllegalArgumentException("No enum constant for value: " + value);
}
}
interface Operation {
long apply(long x, long y);
}
enum BasicOperation implements Operation {
PLUS {public long apply(long x, long y){return x + y;}},
MINUS {public long apply(long x, long y){return x - y;}},
TIMES {public long apply(long x, long y){return x * y;}},
DIVIDE {public long apply(long x, long y){return x / y;}};
}
public class Main {
public static void main(String[] args) {
Day d = Day.MON;
d.setDay("Δευτέρα");
System.out.println(d.getDay());
d = Day.fromValue("Saturday");
System.out.println(d);
int a = 4, b = 2;
Operation op = BasicOperation.PLUS;
System.out.print(a + " " + op + " " + b + " = " + op.apply(a, b));
}
}