In Java, can enumeration types implement interfaces?

Yes, Enum implements an interface in Java, when we need to implement some business logic that is tightly coupled with the distinguishable properties of a given object or class , it can be useful. Enumeration is a special data type added in Java 1.5 version. Enumerations are constants , by default they are static strong> and final, so the names of enum type fields are capitalized letter.

Example

interface EnumInterface {
   int calculate(int first, int second);
}
enum EnumClassOperator implements <strong>EnumInterface </strong>{ // <strong>An Enum implements an interface</strong>
   ADD {
      @Override
      public int calculate(int first, int second) {
         return first + second;
      }
   },
   SUBTRACT {
      @Override
      public int calculate(int first, int second) {
         return first - second;
      }
   };
}
class Operation {
   private int first, second;
   private EnumClassOperator operator;
   public Operation(int first, int second, EnumClassOperator operator) {
      this.first = first;
      this.second = second;
      this.operator = operator;
   }
   public int calculate() {
      return operator.calculate(first, second);
   }
}
<strong>// Main Class</strong>
public class EnumTest {
   public static void main (String [] args) {
      Operation add = new Operation(20, 10, <strong>EnumClassOperator.ADD</strong>);
      Operation subtract = new Operation(20, 10, <strong>EnumClassOperator.SUBTRACT</strong>);
      System.out.println("Addition: " + add.calculate());
      System.out.println("Subtraction: " + subtract.calculate());
   }
}

Output

<strong>Addition: 30
Subtraction: 10</strong>

The above is the detailed content of In Java, can enumeration types implement interfaces?. For more information, please follow other related articles on the PHP Chinese website!