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SecurityCategory.java
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41 lines (40 loc) · 1.06 KB
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// enums/SecurityCategory.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
// More succinct subcategorization of enums
import onjava.*;
enum SecurityCategory {
STOCK(Security.Stock.class), BOND(Security.Bond.class);
Security[] values;
SecurityCategory(Class<? extends Security> kind) {
values = kind.getEnumConstants();
}
interface Security {
enum Stock implements Security { SHORT, LONG, MARGIN }
enum Bond implements Security { MUNICIPAL, JUNK }
}
public Security randomSelection() {
return Enums.random(values);
}
public static void main(String[] args) {
for(int i = 0; i < 10; i++) {
SecurityCategory category =
Enums.random(SecurityCategory.class);
System.out.println(category + ": " +
category.randomSelection());
}
}
}
/* Output:
STOCK: MARGIN
STOCK: LONG
STOCK: LONG
STOCK: MARGIN
BOND: MUNICIPAL
BOND: MUNICIPAL
STOCK: LONG
BOND: JUNK
STOCK: MARGIN
BOND: JUNK
*/