Page History

...

new UnaryFun() {
    Object apply(Object arg) {
        // concrete code to compute something and return the result
        // …...
    }
}

Since Object is the superclass of all concrete classes in Java, in practice, we often have to perform type-casting on the arg in order to perform the desired operation. More than often, we need to type-cast the returned result in order to make proper use of it.

...