creating an object reference name from String variable in Java

Gflames · 07-19-2014, 10:13 AM

I want to accept input from the console as a String and use it to name objects, ie
String objectName = input.next();
//use the content of variable objectName as a reference name like this
Class +objectName = new Class;

NevemTeve · 07-19-2014, 11:09 AM

I think it is 'associative memory' (or 'hash') indexed by strings, what might be comparable to what you want.

Gflames · 07-19-2014, 12:26 PM

reference please or use it in an example

Gflames · 07-20-2014, 03:42 PM

after some reserch I have managed to come up with this solution but it is giving me the followin error
ityRoutes.java:19: error: incompatible types: CAP#1 cannot be converted to Class
Class city1 = Class.forName("City").newInstance();
^
This is part of the code
System.out.println("Enter Number of Nodes or Cities");
Scanner input = new Scanner(System.in);
int numberOfCities = input.nextInt();
for(int i = 0; i < numberOfCities; i++)
{
System.out.println("Enter Name For City: "+i);
String cityName = input.next();
try{
Class city1 = Class.forName("City").newInstance();
city1.getCityName(cityName);
System.out.println("Enter cities Connected to" +cityName +"\nEnter 0 if none or Done");
} catch (ClassNotFoundException e) {

} catch (InstantiationException e) {

} catch (IllegalAccessException e) {
}

}

NevemTeve · 07-20-2014, 11:40 PM

Code:

import java.util.HashMap;

class City {
    String state;
    City (String state) {
	this.state= state;
    }
    String getState () {
	return state;
    }
};

public class HMtest {
    static void TestGet (HashMap<String, City> map, String key) {
	City c= map.get (key);
	if (c!=null) System.out.println (key + " found in " + c.getState ());
	else         System.out.println (key + " not found");
    }

    public static void main (String args[]) {
	HashMap<String, City> named_cities = new HashMap<String, City>();
	named_cities.put ("Berlin", new City("Germany"));
	named_cities.put ("Roma", new City("Italy"));
	TestGet (named_cities, "Madrid");
	TestGet (named_cities, "Roma");
    }
}