java8 函数式编程实现策略模式

代码如下：

/**
 * java8 函数式编程实现策略模式
 *
 * @date 2022/11/4
 */
public class FunctionStrategy {

    private static Map<String, Function<String, String>> functionMap = new HashMap<>();


    static {
        BankBusiness bankBusiness = new BankBusiness();
        functionMap.put("one", bankBusiness::one);
        functionMap.put("two", bankBusiness::two);
        functionMap.put("three", bankBusiness::three);
    }

    public String getCheckResult(String key, String str) {
        Function<String, String> function = functionMap.get(key);
        if (function != null) {
            return function.apply(str);
        }
        return "error";
    }

    public static void main(String[] args) {
        FunctionStrategy functionStrategy = new FunctionStrategy();
        System.out.println(functionStrategy.getCheckResult("one", "来咯"));
    }

    //内部类
    private static class BankBusiness {

        public String one(String str) {
            return "第一次执行" + str;
        }

        public String two(String str) {
            return "第二次执行" + str;
        }

        public String three(String str) {
            return "第三次执行" + str;
        }
    }

}

　　执行结果：