如何将arraylist或数组放入JList中的构造函数？

我的想法是在Java swing中创建一个应用程序，其中包含一个登录窗口，然后是一种公司选择器。但我需要从json url中导入公司列表和ID，这就是我所做的，但我怎样才能将构造函数中的数组推入JList？如何将arraylist或数组放入JList中的构造函数？

这是我的主要方法

import java.awt.EventQueue; 

public class Main { 
    public static void main(String[] args) {   
     LoginWindow loginWindow = new LoginWindow(); 
     loginWindow.setVisible(true); 
     loginWindow.setSize(500, 400); 
     //loginWindow.setDefaultCloseOperation(Exit); 
    } 
}

这里是我的登录窗口。

import java.awt.*; 
import javax.swing.*; 

public class LoginWindow extends JFrame { 

private JLabel item1; 
private JLabel item2; 
private JTextField login; 
private JPasswordField password; 
private JButton loginButton; 
private JPanel loginPanel; 


GridBagConstraints gbc = new GridBagConstraints(); 

public static void main(String[] args) { 

} 

LoginWindow(){ 
    super("MyApp"); 
    setLayout(new GridBagLayout()); 
    gbc.insets = new Insets(5, 5, 5, 5); 
    item1 = new JLabel("Login"); 
    gbc.gridx = 0; 
    gbc.gridy = 1; 
    add(item1, gbc); 

    item2 = new JLabel("Password"); 
    gbc.gridx = 0; 
    gbc.gridy = 2; 
    add(item2, gbc); 

    login = new JTextField(15); 
    gbc.gridx = 2; 
    gbc.gridy = 1; 
    add(login, gbc); 

    password = new JPasswordField(15); 
    gbc.gridx = 2; 
    gbc.gridy = 2; 
    add(password, gbc); 

    loginButton = new JButton("Login");  
    gbc.gridx = 2; 
    gbc.gridy = 3; 
    add(loginButton, gbc); 

    loginButton.addActionListener(new ActionListener() { 

     public void actionPerformed(ActionEvent e) { 
      if("admin".equals(password.getText()) && 
"admin".equals(login.getText())){ 
       dispose(); 
       CompanySelectionWindow frame = new CompanySelectionWindow(); 
       frame.setVisible(true); 
       frame.setSize(500, 300); 
       frame.setDefaultCloseOperation(EXIT_ON_CLOSE); 
      } 
      else{ 
     JOptionPane.showMessageDialog(null, "Wrong password or login"); 
      } 

     }}); 



} 

}

和这里的CompanySelectionWindow

import javax.swing.*; 
import org.json.*; 
import java.awt.*; 
import java.io.BufferedReader; 
import java.io.InputStreamReader; 
import java.net.URL; 
import java.net.URLConnection; 
import java.nio.charset.Charset; 
import java.util.ArrayList; 


public class CompanySelectionWindow extends JFrame { 

private JLabel label; 
private JList list; 
//private JList<JSONArray> list = new JList<>(); 
DefaultListModel<companyInfo> model = new DefaultListModel<>(); 
GridBagConstraints gbc = new GridBagConstraints(); 


public CompanySelectionWindow() { 
    super("Company Selection Window"); 
    //model.addElement(element); 
    setLayout(new GridBagLayout()); 
    gbc.insets = new Insets(5, 5, 5, 5); 
    label = new JLabel("Choose company:"); 
    gbc.gridx = 3; 
    gbc.gridy = 3; 
    add(label); 
    **list = new JList(what and how put something here?);** 
} 

public static void main(String[] args) { 
    String jsonString = callURL("xxx"); 
    System.out.println("\n\njsonString: " + jsonString); 
    ArrayList<JSONObject> array = new ArrayList<>(); 
    //String str = "{id:\"123\",name:\"myName\"} {id:\"456\",name:\"yetanotherName\"}{id:\"456\",name:\"anotherName\"}"; 
    String[] strs = jsonString.split("(?<=\\})(?=\\{)"); 
    for (String s : strs) { 
     System.out.println(s);   
    } 
    try { 

     JSONArray jsonArray = new JSONArray(jsonString); 

     int count = jsonArray.length(); // get totalCount of all jsonObjects 
     for(int i=0 ; i< count; i++){ // iterate through jsonArray 
      JSONObject jsonObject = jsonArray.getJSONObject(i); // get jsonObject @ i position 
      array.add(i, jsonObject); 
      System.out.println("jsonObject " + i + ": " + jsonObject); 
     } 

    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 


} 

public String[] pullArray(String[] a){ 
    return a; 
} 

public static String callURL(String myURL) { 
    System.out.println("Requested URL:" + myURL); 
    StringBuilder sb = new StringBuilder(); 
    URLConnection urlConn = null; 
    InputStreamReader in = null; 

    try { 
     URL url = new URL(myURL); 
     urlConn = url.openConnection(); 
     if (urlConn != null && urlConn.getInputStream() != null) { 
      in = new InputStreamReader(urlConn.getInputStream(), 
        Charset.defaultCharset()); 
      BufferedReader bufferedReader = new BufferedReader(in); 
      if (bufferedReader != null) { 
       int cp; 
       while ((cp = bufferedReader.read()) != -1) { 
        sb.append((char) cp); 
       } 
       bufferedReader.close(); 
      } 

     } 
    in.close(); 
    } catch (Exception e) { 
     throw new RuntimeException("Exception while calling URL:"+ myURL, e); 
    } 

    return sb.toString(); 
}

我试图让一个ArrayList，甚至正常的阵列出来的JSONarray并推JList（因为我认为这将是做正确的方式）。我知道这里的一切都有点混乱。我看了几篇教程，并阅读了一些文章，但我无法做到。对不起，我的英语不好，对不起，如果我的问题是愚蠢的:)。使用DefaultListModel，而不是一个ArrayList的感谢

来源

2016-04-22 Malina

我不认为你是愚蠢的。 –

public CompanySelectionWindow(String []ar) { 
    super("Company Selection Window"); 
    //model.addElement(element); 
    setLayout(new GridBagLayout()); 
    gbc.insets = new Insets(5, 5, 5, 5); 
    label = new JLabel("Choose company:"); 
    gbc.gridx = 3; 
    gbc.gridy = 3; 
    add(label); 
    jList1.setListData(ar); 
}

让你的构造函数来接受你的字符串项目的数组，然后调用该方法传递一个数组

public CompanySelectionWindow(ArrayList<String> listdata) { 
    super("Company Selection Window"); 
    //model.addElement(element); 
    setLayout(new GridBagLayout()); 
    gbc.insets = new Insets(5, 5, 5, 5); 
    label = new JLabel("Choose company:"); 
    gbc.gridx = 3; 
    gbc.gridy = 3; 
    add(label); 
    jList1.setListData(listdata.toArray()); 
}

也可以使构造函数接受数组列表，那么你可以按照上面的方法来添加列表到数据

来源

2016-04-22 15:56:53 Priyamal

尝试：

DefaultListModel<JSONObject> array = new DefaultListModel<>();

然后将它传递到JList的构造。

来源

2016-04-22 15:49:17

如何将arraylist或数组放入JList中的构造函数？

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