How to Use Enum in Java

In this example we will show how to use enum in Java.

Source Code

1)Start by creating an enumerated type

package com.beginner.examples;

public enum Operation {
    PLUS, MINUS, TIMES, DIVIDE;

    double calculate(double x, double y) {
        switch (this) {
        case PLUS:
            return x + y;
        case MINUS:
            return x - y;
        case TIMES:
            return x * y;
        case DIVIDE:
            return x / y;
        default:
            throw new AssertionError("Unknown operations " + this);
        }
    }
}

package com.beginner.examples;

public class EnumExample1 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println(Operation.DIVIDE);
    }
}

output:

  DIVIDE

package com.beginner.examples;

public class EnumExample2 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        double result = Operation.PLUS.calculate(2, 6);
        System.out.println(result);
    }

}

output:

8.0