相当于C ++的std :: bind在Java？ [英] Equivalent of C++'s std::bind in Java?

问题描述

有什么方法绑定参数参数到Java中的函数指针，就像你可以用C ++中的std :: bind？

Is there a way to bind parameters parameters to function pointers in Java like you can with std::bind in C++? What would the Java equivalent of something like this be?

void PrintStringInt(const char * s, int n)
{
    std::cout << s << ", " << n << std::endl;
}

void PrintStringString(const char * s, const char * s2)
{
    std::cout << s << ", " << s2 << std::endl;
}

int main()
{
    std::vector<std::function<void(const char *)>> funcs;
    funcs.push_back(std::bind(&PrintStringInt, std::placeholders::_1, 4));
    funcs.push_back(std::bind(&PrintStringString, std::placeholders::_1, "bar"));
    for(auto i = funcs.begin(); i != funcs.end(); ++i){
        (*i)("foo");
    }
    return 0;
}

推荐答案

认为你可以得到一行一行的翻译， bind 不会将1：1映射到任何Java结构;

This is as close as I think you can get to a line by line translation, bind does not map 1:1 to any Java construct;

static void PrintStringInt(String s, int n)
{
    System.out.println(s + ", " + n);
}

static void PrintStringString(String s, String s2)
{
    System.out.println(s + ", " + s2);
}

interface MyCall {
    void fn(String value);
}

public static void main(String[] argv)
{
    Vector<MyCall> funcs = new Vector<MyCall>();
    funcs.add(new MyCall() { 
      @Override public void fn(String value) {PrintStringInt(value, 4); }});
    funcs.add(new MyCall() { 
      @Override public void fn(String value) {PrintStringString(value, "bar"); }});
    for(MyCall i : funcs){
        i.fn("foo");
    }
}

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