将可调用对象转换为函数，同时保持其hashCode

import java.util.function.Function;

public class CallableToFunctionExample {
    public static void main(String[] args) {
        CallableObject callableObject = new CallableObject();
        Function<String, Integer> function = callableObject::call;
        
        System.out.println(function.apply("input")); // 调用函数
        
        int hashCode = function.hashCode(); // 获取hashCode
        System.out.println(hashCode);
    }
}

class CallableObject {
    public int call(String input) {
        // 实现可调用对象的功能
        return input.length();
    }
}