java ArrayList搜索方法

Question

我有ArrayList，其中包含Train s：

的列表

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;
    }
}

我想通过ArrayList和villeDepart搜索villeArrivee。我怎么能这样做？

Answer 1

我可以想到，你必须使用循环并浏览整个列表。

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
  }
}

修改

正如@Atri所提到的，你可以覆盖你的equals方法。这更容易。 在Train课程中

@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;
  }
}

在SO中阅读This Question。