函数式接口验证

package com.xlg.task.common;

import java.util.HashMap;

public class FunctionalInterfaceTest {
    public static void main(String[] args) {
        int x = 1;
        int y = 2;
        String key = "2";
        HashMap<String, NoParamConsume> map = new HashMap<>();
        map.put("1", () -> get1(x, y));
        map.put("2", () -> get2(2, 2, 3));
        map.forEach((k, v) -> {
            if (k.equals(key)) {
                System.out.println(v.apply());
            }
        });
    }

    private static Integer get2(Integer x, Integer y, Integer z) {
        return 2 * x + y + z;
    }

    private static Integer get1(Integer x, Integer y) {
        return 2 * x + 1 + y;
    }

}

@FunctionalInterface
interface NoParamConsume<R> {
    R apply();
}