Generics Java

#include <stdlib.h>
#include <conio.h>
#include <string.h>
#include <stdio.h>
#include <iostream.h>
#include <math.h>
//
// a b s t r a c t c l a s s "e l e m"
//
class elem
{
public:
virtual int fscanf_el(FILE *f)=0;
virtual void show(const char* opening=NULL,
const char* ending=NULL)=0;
virtual int free() = 0;
virtual int cmp(elem& e2) = 0;
int operator > (elem& e2)
{
return cmp(e2)>0;
}
int operator >= (elem& e2)
{
return cmp(e2)>=0;
}
 
int operator < (elem& e2)
{
return cmp(e2)<0;
}
int operator <= (elem& e2)
{
return cmp(e2)<=0;
}
int operator == (elem& e2)
{
return cmp(e2)==0;
}
int operator != (elem& e2)
{
return cmp(e2)!=0;
}
protected:
void error(char* message)
{
cerr << message;
cout << "Press any key to fin...\n";
getch();
exit(1);
}
};

//
// c l a s s "u s u a l _ e l e m"
//
class usual_elem : public elem
{
protected:
char name[16];
int year;
 
 
double salary;
public:
usual_elem()
{
name[0]='\0';
year=0;
salary=0.0;
}
usual_elem(char* init_name, int init_year, double init_salary)
{
strcpy(name, init_name);
year=init_year;
salary=init_salary;
}
virtual int fscanf_el(FILE *f)
{
return fscanf(f, "%s %d %lf", name, &year, &salary);
}
virtual void show(const char* opening=NULL,
const char* ending=NULL)
{
if(!opening)
opening="";
if(!ending)
ending="\n";
cout << opening;
if(name[0]) // sau mai bine if(free()==0), sau if(!free())
cout << name << ", " << year << ", " << salary;
cout << ending;
}
virtual int free()
{
return name[0]=='\0';
}
virtual int cmp(elem& e2)
 
return strcmp(this->name, ((usual_elem&)e2).name);
}
};

//
// a b s t r a c t c l a s s "S D"
//
class SD
{
protected:
FILE* pf;
long ncomp;
public:
SD()
{
pf=NULL;
ncomp=0;
}
SD(char* file_name)
{
if(!(pf=fopen(file_name, "rt")))
{
char *mes = new char[5+strlen(file_name)+12+1];
error(strcat(strcat(strcpy(mes,"File "),file_name),
" not found!\n"));
 
}
ncomp=0;
}
~SD()
{
if(pf)
fclose(pf);
}
virtual void show(const char* opening=NULL,
const char* ending=NULL)=0;
long get_ncomp()
{
return ncomp;
}
void reset_ncomp()
{
ncomp=0;
}
protected:
void error(char* message)
{
cerr << message;
cout << "Press any key to fin...\n";
getch();
exit(1);
}
};

//
// c l a s s "t a b l e"
//
const NMAX=200;
//
template <class el> class table : public SD
{
protected:
int n; // numărul de înregistrări tabelare
 
el t[NMAX]; // vector de înregistrări tabelare
public:
table()
{
n=0;
}
table(char* file_name) :
SD(file_name)
{
int repeated;
n=0;
while(!feof(pf))
if(t[n].fscanf_el(pf)>0)
{
if ( (repeated=search(t[n]))>=0 )
{
char message[60];
char repeated_str[10];
message[0]='\0';
strcat(message,
"Key coincides with the key in the position: ");
strcat(message, itoa(repeated+1, repeated_str, 10));
strcat(message, "!\n");
error(message);
}
n++;
}
fclose(pf) , pf=NULL;
}
virtual void show(const char* opening =NULL,
const char* ending=NULL)
{
clrscr();
cout << opening;
if(!opening)
opening="";
if(!ending)
ending="\n";
for(int i=0; i<n; i++)
{
if(i>0 && i%20==0)
{
cout << "Press any key to continue...\n";
getch();
clrscr();
cout << opening;
}
cout << (i+1) << ". "; t[i].show();
}
cout << ending;
cout << "End of Table. Press any key ...\n";
getch();
}
int search(el e)
{
int position = -1;
for(int i=0; (position==-1) && i<n ; i++)
if(ncomp++, e==this->t[i])
position=i;
return position;
}
int get_n()
{
return n;
}
};