java ArrayList search methods [duplicate]

Question

I have an ArrayList which contains a list of Trains:

package train;

public class Train {

    private String nom;
    private String villeDepart, villeArrivee;

    public Train() {
        super();
        // TODO Auto-generated constructor stub
    }
    public Train(String nom, String villeDepart, String villeArrivee) {
        super();
        this.nom = nom;
        this.villeDepart = villeDepart;
        this.villeArrivee = villeArrivee;
    }
    public String getNom() {
        return nom;
    }
    public void setNom(String nom) {
        this.nom = nom;
    }
    public String getVilleDepart() {
        return villeDepart;
    }
    public void setVilleDepart(String villeDepart) {
        this.villeDepart = villeDepart;
    }
    public String getVilleArrivee() {
        return villeArrivee;
    }
    public void setVilleArrivee(String villeArrivee) {
        this.villeArrivee = villeArrivee;
    }
}

I want to search the ArrayList by villeDepart and villeArrivee. How can I do this?

See stackoverflow.com/questions/985229/search-in-java-arraylist for solutions (basically you'll need to walk the whole list with a "for" looking for a match). — John Hascall
– John Hascall, Commented Dec 31, 2015 at 21:24

Community · Accepted Answer · 2017-05-23 11:52:26Z

2

As I can think of, you have to use a loop and go through whole list.

for each (Train train in list) {
  String villeDepart = train.getVilleDepart();
  String villeArrivee = train.getVilleArrivee();

  if (villeDepart.equals("String you want to match") && villeArrivee.equals("Next String to match") {
    //You got your train
  }
}

EDIT:

As @Atri mentioned, you can Override your equals method. It's much easier. In your Train class,

@Override
public boolean equals(Object obj) {
  Train train = (Train) obj;
  if (this.villeArrivee.equals(train.getVilleArrivee()) && this.villeDepart.equals(train.getVilleDepart())) {
    return true;
  } else {
    return false;
  }
}

Read This Question in SO.

edited May 23, 2017 at 11:52

CommunityBot

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answered Dec 31, 2015 at 21:29

ThisaruG

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4 Comments

John Hascall Over a year ago

Using a foreach loop like for (Train t : trainList) { ... t.getVilleDepart() ... } is more elegant...

ThisaruG Over a year ago

Thanks. I'll update this.

MED.HACEN Over a year ago

thinks brothers but i to write a method which returns a list of trains: like this: public List <Train> getTrains(String villeDepart, String villeArrivee){} how can i do this with an arrayList

ThisaruG Over a year ago

As I mentioned in my code //You got your train - you can do whatever you want. Create an ArrayList in the beginning of your method (before for each loop), then add your train into the newly created ~ArrayList`. Return it later.

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