Declare Consumer and action with it in one line

Question

Experimenting with my code I was wondering is there any way to "compress" it more (one-liner is an ultimate goal).

vanilla java:

public void setUsingSwitch(Field field, String value) {
    switch (field) {
        case FIRST_NAME:
            setFirstName(value);
            break;
        case LAST_NAME:
            setLastName(value);
            break;
        default:
            throw new IndexOutOfBoundsException("Unknow field " + field);
    }
}

"compressed":

public void setUsingConsumer(Field field, String value) {
    Consumer<String> setter = field == FIRST_NAME ? this::setFirstName : field == LAST_NAME ? this::setLastName : v -> {
        throw new IndexOutOfBoundsException("Unknow field " + field);
    };
    setter.accept(value);
}

For both used:

public static enum Field { FIRST_NAME, LAST_NAME }

void setFirstName(String value) { }

void setLastName(String value) { }

Of course it is just scientific interest for me but is there any way to write even smaller code?

Answer 1

Here's an alternative approach which is not shorter, but sometimes preferable:

import java.util.function.BiConsumer;

public class MyObj {
    public static enum Field {
        FIRST_NAME(MyObj::setFirstName),
        LAST_NAME(MyObj::setLastName);

        Field(BiConsumer<MyObj, String> setter) {
            this.setter = setter;
        }

        final BiConsumer<MyObj, String> setter;
    }

    public void set(Field field, String value) {
        field.setter.accept(this, value);
    }

    public void setFirstName(String s) {...}
    public void setLastName(String s) {...}
}