将ArrayList添加到摆动ComboBox中

问题描述

我正在使用内置的拖放式GUI构建器使用Netbeans构建GUI，我正努力获取jComboBox来获取数组列表，希望有人指出我做错了什么。我尝试的所有操作似乎都会导致错误，因此我在这里拔头发试图使其正常工作。

我已经使用以下代码创建了comboBox

jComboBox1 = new javax.swing.JComboBox();

如果有人可以告诉我如何使用“可用的我的列表”填充comboBox，我将非常感谢

我已经在初始化的主要方法中包含了对象：

//Created a user object to represent a customer of the streaming service 
User user;

//Initiliased video object
Video video ;


//Create new arraylist using  AvailableVideos
List AvailableVideos = new ArrayList<>();

 //Created CurrentPlaylist object to store a collection of video objects
List<Video> CurrentPlaylist= new ArrayList<>();


MyVideos myVideos = new MyVideos(user);

然后在我拥有的initComponents中

    public GUI_App() {
     
    initComponents();

    //Call the AddVideos method to add available videos 
    Video.addVideos((ArrayList<Video>) AvailableVideos);
}

下面，我包含了我要调用的两个类

public class MyVideos {
private ArrayList<Video> items;
private int currentItemNumber;
private User user;

public MyVideos(User user) {      
    this.user = user;
    this.items = new ArrayList<>();
    this.currentItemNumber = 0;
}

public MyVideos() {      
    this.user = new User("Intro Account",1000);
    this.items = new ArrayList<>();
    freebieMedia();   
    this.currentItemNumber = 0;
}

private void freebieMedia(){
    items.add(new Series("Game of Thrones",50,false));
    items.add(new Series("Planet Earth",60,true));
    items.add(new MusicVideo("Losing my religion",200,"REM"));
    items.add(new Movie("The Last Jedi",9120,"Rian Johnson"));
}

public User getUser(){
    return user;
}

public int getNumItems() {
    return items.size();
}

public ArrayList<Video> getItems() {
    return items;
}

public Video getMedia(int i) {
    return items.get(i);
}

public void addMedia(Video m){
    if(user.hasSufficientBalance(m)) {
        items.add(m);
        this.user.changeBalance(-m.getPrice());
    }
    System.out.println("added " + m.getTitle());
}
  
public String getScheduleAsstring(){
    String rs = "";
    for(Video m: items){
        rs += m.toString() + "\n";
    }
    return rs;
}

public int getTotalDuration(){
    int time = 0;
    for(Video m: items){
        time += m.getDuration();
    }
    return time;
}

public int getTotalCost(){
    int cost = 0;
    for(Video m: items){
        cost += m.getPrice();
    }
    return cost;
}

@Override
public String toString() {
    String str = "Number of Items:"  + this.getNumItems() + "\t"
            + "Time: " + getTotalDuration()
            + getScheduleAsstring();

    return str; 
}


/* A method to add a media item without chargeing user's wallet */    
public void addFreeMedia(Video m){
    items.add(m);
}    /* A method to remove a media item from the playlist */    
public void removeMedia(int i) {
    items.remove(i);
}
}

视频课程

public abstract class Video {

private int duration;
private String title;

public Video(String name,int minutes) {
    this.title = name;
    this.duration = minutes;
}

public String getTitle() {
    return title;
}

public void setTitle(String title) {
    this.title = title;
}    

public int getDuration() {
    return duration;
}

public void setDuration(int d) {
    this.duration = d;
}

  
@Override
public String toString() {
    DecimalFormat round = new DecimalFormat("0.00");
    return  this.getTitle() 
            + ",Duration: " + this.getDuration() + "min," +
            "Cost: £" + round.format(getPrice());
}

public abstract double getPrice();




/* Convenience method for Part 2 to allow Video objects can be added */
public static void addVideos(ArrayList<Video> v){
    v.add(new Series("Game of Thrones",false));
    v.add(new Series("Planet Earth",true));
    v.add(new MusicVideo("Losing my religion",4,"REM"));
    v.add(new Movie("The Last Jedi",152,"Rian Johnson"));
}
}

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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