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#include <iostream>
#include <string>
using namespace std;
 
class uzel
{
private:
	int dannye;
	uzel* u_sled;
	uzel* u_pred;
public:
	friend class spisok;
};
 
class spisok
{
private:
	uzel* u_golova;
	uzel* u_hvost;
public:
	spisok(): u_golova(NULL), u_hvost(NULL) {}
	//Создаём новый узел списка
	void push(int znach)
	{
		uzel* u_NovUzel = new uzel;
		u_NovUzel->dannye = znach;
		if (u_golova != NULL)
		{
			u_golova->u_pred = u_NovUzel;
		}
		u_NovUzel->u_pred = NULL;
		u_NovUzel->u_sled = u_golova;
		if (u_NovUzel->u_sled == NULL) u_hvost = u_NovUzel;
		u_golova = u_NovUzel;
	}
	//Вывод списка начиная с головы
	void sled()
	{
		uzel* u_SledUzel = u_golova;
		while (u_SledUzel)
		{
			cout << u_SledUzel->dannye << endl;
			u_SledUzel = u_SledUzel->u_sled;
		}
	}
	//Вывод списка начиная с хвоста
	void pred()
	{
		uzel* u_PredUzel = u_hvost;
		while (u_PredUzel)
		{
			cout << u_PredUzel->dannye << endl;
			u_PredUzel = u_PredUzel->u_pred;
		}
	}
};
 
int main()
{
	spisok stek;
	string vvod = "&";
	while (vvod != "exit")
	{
		int znach;
		cin >> vvod;
		if (vvod == "push") { cin >> znach; stek.push(znach); }
		if (vvod == "sled") stek.sled();
		if (vvod == "pred") stek.pred();
	}
 
}

Main.java:1: error: illegal character: '#'
#include <iostream>
^
Main.java:1: error: class, interface, or enum expected
#include <iostream>
         ^
Main.java:2: error: illegal character: '#'
#include <string>
^
Main.java:7: error: illegal start of type
private:
       ^
Main.java:9: error: <identifier> expected
	uzel* u_sled;
	    ^
Main.java:9: error: <identifier> expected
	uzel* u_sled;
	            ^
Main.java:10: error: <identifier> expected
	uzel* u_pred;
	    ^
Main.java:10: error: <identifier> expected
	uzel* u_pred;
	            ^
Main.java:11: error: illegal start of type
public:
      ^
Main.java:12: error: <identifier> expected
	friend class spisok;
	      ^
Main.java:12: error: '{' expected
	friend class spisok;
	                   ^
Main.java:17: error: illegal start of type
private:
       ^
Main.java:18: error: <identifier> expected
	uzel* u_golova;
	    ^
Main.java:18: error: <identifier> expected
	uzel* u_golova;
	              ^
Main.java:19: error: <identifier> expected
	uzel* u_hvost;
	    ^
Main.java:19: error: <identifier> expected
	uzel* u_hvost;
	             ^
Main.java:20: error: illegal start of type
public:
      ^
Main.java:21: error: ';' expected
	spisok(): u_golova(NULL), u_hvost(NULL) {}
	        ^
Main.java:25: error: '(' or '[' expected
		uzel* u_NovUzel = new uzel;
		                          ^
Main.java:26: error: not a statement
		u_NovUzel->dannye = znach;
		^
Main.java:29: error: not a statement
			u_golova->u_pred = u_NovUzel;
			^
Main.java:31: error: not a statement
		u_NovUzel->u_pred = NULL;
		^
Main.java:32: error: not a statement
		u_NovUzel->u_sled = u_golova;
		^
Main.java:42: error: not a statement
			cout << u_SledUzel->dannye << endl;
			     ^
Main.java:52: error: not a statement
			cout << u_PredUzel->dannye << endl;
			     ^
Main.java:65: error: not a statement
		cin >> vvod;
		    ^
Main.java:66: error: not a statement
		if (vvod == "push") { cin >> znach; stek.push(znach); }
		                          ^
Main.java:71: error: reached end of file while parsing
}
 ^
28 errors

Standard output is empty