有没有更好的方法来处理R中的if-else语句？

Question

我正在使用if-else语句为变量设置布尔值，但是用更少的代码有更好的方法吗？

import java.util.ArrayList;
import java.util.List;
import java.util.function.Consumer;

public class RunnableList {

    private List<Invocable<?>> invocables = new ArrayList<Invocable<?>>();

    public <T> void add(T target, Consumer<T> invocation) {
        invocables.add(new Invocable<T>(target, invocation));
    }

    public void run() {
        invocables.forEach(Invocable::runInvocation);
    }

    static class Invocable<T> {
        private final T target;
        private final Consumer<T> invocation;

        public Invocable(T target, Consumer<T> invocation) {
            this.target = target;
            this.invocation = invocation;
        }

        public void runInvocation() {
            invocation.accept(target);
        }
    }

    // TEST

    public static void main(String[] args) {
        RunnableList runnableList = new RunnableList();
        runnableList.add(new ClassA(), o -> o.run1("hello from A1"));
        runnableList.add(new ClassB(), o -> o.run1("hello from B1"));
        runnableList.add(new ClassC(), o -> o.run1("hello from C1"));

        runnableList.add(new ClassA(), ClassA::run2);
        runnableList.add(new ClassB(), ClassB::run2);
        runnableList.add(new ClassC(), ClassC::run2);
        runnableList.run();
    }

    static class ClassA {
        public void run1(String msg) {
            System.out.println("A.run1: " + msg);
        }
        public void run2() { System.out.println("A.run2"); }
    }
    static class ClassB {
        public void run1(String msg) {
            System.out.println("B.run1: " + msg);
        }
        public void run2() { System.out.println("B.run2"); }
    }
    static class ClassC {
        public void run1(String msg) {
            System.out.println("C.run1: " + msg);
        }
        public void run2() { System.out.println("C.run2"); }
    }
}