Thread: HashCode for calculate different objects

Hello, I'm trying to make a method that creates objects of a parameterized type randomly, but also to store the hashCode of different objects created and if at any time the percentage of different objects is less than 50% throw an exception.

This last part is where I've gotten stuck. I have created a population property where I store the different hashCodes and update it in the method adding the new hashCode from the new object. But I don't know how to do for to know if the percentage of different objects is less than 50%. See if someone can help me out.

package fp.tipos.apps;
 
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
import java.util.Random;
 
public class FactoriaApps {
 
	private static Integer codigos = 0;
	private static Integer numCodigos = 0;
 
 
 
	public static Integer getCodigos(){
		return codigos;
	}
 
public static App createApp(Random rnd){
		String nombre = cadenaAleatoria(rnd, 5);
		Double tamaño = rnd.nextDouble() * 1024.0;
		Calendar fechaVersion = Calendar.getInstance();
		fechaVersion.set(2000, 3, 3);
 
		Integer numInstalaciones = rnd.nextInt(2000001);
		Double precio = rnd.nextDouble() * 6.0;
		String desarrollador = cadenaAleatoria(rnd, 3);
 
		App a = new AppImpl(TipoSO.ANDROID, nombre, tamaño, fechaVersion, numInstalaciones, precio, desarrollador);
 
		codigos = codigos + a.getSO().hashCode() + a.getDesarrollador().hashCode()*31 + a.getNombre().hashCode()*31;
 
		if(codigos < numCodigos) //here is where I don't know what to do
 
		return a;
	}

Regards!

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the percentage of different objects is less than 50% throw an exception

This seems like a simple if() statement:

if ( percentDifferent < 0.5 )
{
    throw new Exception();
}

Is it more complicated than that?