CRUD vehicules, Java

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.ListIterator;

class Vehicule {

private int id;
    private String type;
    private List<Vehicule> list;
    private String immat;
    private int key;
    
    public Vehicule() {
        list = new ArrayList<Vehicule>();
        for(int i=0;i<5;i++) {
            list.add(new Vehicule(i,"C4","QQ ZZ 36"));
        }
        key=5;
    }
    
    public Vehicule(int id, String type, String immat) {
        super();
        this.id = id;
        this.type = type;
        this.immat = immat;
    }

public void modVehicule(int id, String type, String immat) {
        for(int i=0;i< this.list.size();i++)
            if (this.list.get(i).id == id) {
                this.list.get(i).type = type;
                this.list.get(i).immat = immat;
            }
    }

public int addVehicule(String type, String immat) {
        list.add(new Vehicule(key++,type,immat));
        return this.key;
    }

public int delVehicule(int id) {
        list.remove(id);
        return this.key;
    }

public List<Vehicule> getList() {
        return this.list;
    }
    public void setType(String type) {
        this.type = type;
    }
    public String getType() {
        return type;
    }
    public String getImmat() {
        return immat;
    }
    public void setImmat(String immat) {
        this.immat = immat;
    }
    public String toString() {
        return "id:" + id + " - Type:" + type + " - Immat:" + immat;
    }
}

class Event {
    private int id;
    private boolean uso;
    private String etat;
    
    public Event(int id, String type) {
        this.id = id;
        this.uso = type.equals("uso");
        if (this.uso)
            etat="en attente";
        if (id==4)
            etat="indispo";
    }
    public void setEtat(String etat) {
        this.etat = etat;
    }
    public String getEtat() {
        return etat;
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getId() {
        return id;
    }
    public void setUso(boolean uso) {
        this.uso = uso;
    }
    public boolean isUso() {
        return uso;
    }
    public String toString() {
        return "id:" + id + " - uso:" + uso + " - etat:" + etat;
    }
}

class Rextester
{  
    public static List<Event> list;
    
    public static void main(String args[])
    {
        Event evt = new Event(5,"uso");
        int id = evt.getId();
        
        Vehicule vh = new Vehicule();
        //for(Vehicule v : vh.getList())
                 //System.out.println(v.toString());
        
        vh.modVehicule(2,"modele","immat");
        vh.addVehicule("C4","QQ 34");
        vh.delVehicule(3);
        
        for(Vehicule v : vh.getList())
                 System.out.println(v.toString());
    }
}

[ + ] Show input
Compilation time: 0.83 sec, absolute running time: 0.16 sec, cpu time: 0.13 sec, memory peak: 18 Mb, absolute service time: 1 sec