JAVA EE: Java Tutorial: Enum in java | Java enum [How to use enum in switch statement

Monday 8 May 2017

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Operation.java

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

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

}

EnumDemo.java

public class EnumDemo
{
    public static void main(String[] args)
    {
        long result = Operation.MULTIPLY.calculate(4, 2);
        System.out.println("Multiply Result = "+result);
        
        result = Operation.PLUS.calculate(4, 2);
        System.out.println("Plus Result = "+result);
    }
}