Question

请帮助我以下代码，我试图从类SearchPort中的方法返回arraylist元素（搜索端口）。然后，这将在相应的类Communication中使用，其中将调用方法returnArray()以提取要用于Jcombox选项的字符串。但是我该怎么做呢？请帮忙。

public class SearchPort {

    CommPortIdentifier portIdentifier;

    ArrayList <String> portFound ;

    public void listPorts() {
        portFound = new ArrayList();
        //Enumeration holds all port objects
        Enumeration<CommPortIdentifier> portEnum = CommPortIdentifier.getPortIdentifiers();
        while ( portEnum.hasMoreElements() ) //while Enumeration contains more port objects 
        {
            portIdentifier = portEnum.nextElement(); //switches through each port
            portFound.add(portIdentifier.getName());           
        } 
     }

     public String returnArray(){

          listPorts();
          for(int i = 0; i < portFound.size(); i++){
              System.out.println(portFound.get(i));

          }
          return portFound;
      }    

  public static void main(String[] args){
      SearchPort run = new SearchPort();
      run.listPorts();
  }

}

public class Communication {

JLabel jLabel1;
JPanel jPanel1;
    JComboBox Connections;

    public Communication() {
        JFrame commFrame = new JFrame("gec");
        commFrame.pack();
        commFrame.setVisible(true);
        commFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    commFrame.setSize(300,300); 

    jLabel1 = new JLabel();
    jPanel1 = new JPanel();

    jLabel1.setText("GEC");
        Font font = new Font("Calibri", Font.BOLD, 14);
        SearchPort port = new SearchPort();
        String [] portStrings = { port.returnArray()}; //add found ports into array
        Connections = new JComboBox(portStrings); 
        Connections.addItemListener(null);
    jLabel1.setFont(font);
    jPanel1.add(jLabel1, BorderLayout.EAST);
        jPanel1.add(Connections, BorderLayout.CENTER);        
       /*Add Contents to the Frame*/ 
        commFrame.add(jPanel1); 
    }

    public static void main(String args[]) {       
        Communication GUI = new Communication();            
    }

}//end class

Answer 1

1）您有三种选择如何通过工具

将项目添加到JCombobox

2）必须在Event Dispatch Thread

上完成对已经可见的Swing GUI的所有更新

3）Swing GUI main方法的初始化将来自Event Dispatch Thread

4）方法

commFrame.pack();
commFrame.setVisible(true);

应该是Communication class

中的最后一行代码行

Java ComboBox与arraylist的关联

1 个答案: