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Wiska
Asked: 2022-08-04 13:40:09 +0800 CST 2022-08-04 13:40:09 +0800 CST

Sort an ArrayList alphabetically

  • 772

I have the code:

private ArrayList<Casa> casas = new ArrayList<Casa>();

And when I add the data I want it to be added in alphabetical order.

I have tried with

Collection.sort(casas);

But I get an error like this:

Required type: List<T

Provided: ArrayList<Home

And I don't know how to solve it.

java

1 Answers

  1. Best Answer

    You can make use of Comparator to sort alphabetically by some attribute of your House class

    Example:

    import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.stream.Collectors;

public class Casa{

private String tipo;
private double precio;

public Casa(String tipo,double precio){
this.tipo=tipo;
this.precio=precio;
}

 
public String getTipo() {
    return tipo;
}
  
public double getPrecio() {
    return precio;
}
 

public static void main(String[] args) {
    
Casa casa1=new Casa("Prefabricada",2570.30);
Casa casa2=new Casa("Amueblada",3540.70);
Casa casa3=new Casa("Betada",4540.70);


List <Casa> casas=new ArrayList<>();

casas.add(casa1);
casas.add(casa2);
casas.add(casa3);
//Ordenamos alfabeticamente por tipo
Comparator<Casa> comparador= Comparator.comparing(Casa::getTipo);

List<Casa>listaPrincipal=casas.stream().sorted(comparador).collect(Collectors.toList());

for (Casa c:listaPrincipal) {
    System.out.println(c.getTipo());
    System.out.println(c.getPrecio());
}

}

    exit:

    enter image description here

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