groovy運算符重寫

//操作符重載
class Rmb {
    def number

    //重寫+
    def plus(o) {
        if (o instanceof Number) {
            new Rmb(number: number + o)
        } else if (o instanceof Rmb) {
            new Rmb(number: number + o.number)
        } else {
            throw new MissingMethodException('plus', Rmb.class, o)
        }
    }

    //重寫switch中的case
    def isCase(o) {
        if(o instanceof Rmb){
            o.number = 200
            return true
        }else {
            false
        }
    }
}
//重寫 +
def aa = new Rmb(number: 10) + 20
def aaa = new Rmb(number: 10) + new Rmb(number: 30)
println aa.number
println aaa.number
//重寫isCase
switch (aa) {
    case new Rmb(number: 10):
        println("是新的${aa.number}")
        break
    case 100:
        println aa.number
        break
}

重載運算符彙總：