相关疑难解决方法(0)

我有一个关于保存自定义对象的arraylist的问题.我有一个名为notitie的课程:

public class Notitie implements Serializable{

private String titel = "";
private String type = "";
private String datum = "";

public void setTitel (String titel){
    this.titel = titel;
}
public String getTitel(){
    return titel;
}
public void setType (String type){
    this.type = type;
}
public String getType(){
    return type;
}
public void setDatum (String datum){
    this.datum = datum;
}
public String getDatum(){
    return datum;
}
}

我创建了一些Notitie的对象,并将它们添加到我的名为notities的arraylist中

ArrayList<Notitie> notities = new ArrayList<Notitie>();

Notitie notitie1 = new Notitie();
notitie1.setTitel("Meting");
notitie1.setType("Watermeting"); …