这能算是个效率问题不（Java、C++)

public class shishi

{

	public static void main (String args[])

	{

		String ss = "123";

		System.out.println(ss);

		fun(ss);

		System.out.println(ss);



	}

	public static void fun(String s)

	{

		s = "asd";  //为什么不在原内存地址修改内容，而要新开辟内存空间再改变指向？

	}

}

#include "stdafx.h"

#include <iostream>

#include <string>



using namespace std;



void fun(string &s)

{

	s  = "asd";

}





int _tmain(int argc, _TCHAR* argv[])

{

	string ss = "123";

	cout<<ss<<endl;

	fun(ss);

	cout<<ss;



	return 0;

}