如何刷新每個選擇的Jcombobox？

Question

public class dropit extends JFrame implements ActionListener{ 
    JComboBox lis,pop; 
    Map<String,String[]>map=new TreeMap<String,String[]>(); 
    JTextField tf; 
    String days[]={"sun","mon","tue","wed","thur","fri","sat"}; 
    String mon[]={"man","van"}; 
    String tue[]={"car","bus"}; 
dropit() 
{ 
    setLayout(null); 
    tf=new JTextField(); 
    tf.setBounds(50, 50, 100, 100); 
    add(tf); 
    map.put("mon", mon); 
    map.put("tue",tue); 
    lis=new JComboBox(days); 
    lis.setSelectedItem(4); 
    lis.addActionListener(this); 
    lis.setBounds(100,100,100,100); 
    add(lis); 


    /*pop=new JComboBox(); 
    pop.setBounds(200,100 , 100, 100); 
    add(pop);*/ 
    setVisible(true); 
    setSize(500,500); 
    } 
public void actionPerformed(ActionEvent e) 
    { 
    lis=(JComboBox) e.getSource(); 
    String name=(String) lis.getSelectedItem(); 
    tf.setText(name); 
    Iterator<String>iter=map.keySet().iterator(); 
    while(iter.hasNext()) 
    { 
     String arryname=iter.next(); 
     String []array=map.get(arryname); 
     if(arryname.contains(name)) 
     { 
      pop=new JComboBox(array); 
      pop.setBounds(200,100 , 100, 100); 
      add(pop) 
      }} 
     pop.repaint(); 
     pop.revalidate(); 
     } 
    public static void main(String[] args) { 
    new dropit(); 
      }} 

組合框是可以正常使用，但在接下來的組合框的填充值是單純的工作首次

我試圖重新繪製重新驗證，但沒有工作

幫我解決這個.Thanks在提前

Answer 1

你永遠不會刪除創建的第一個pop，所以它隱藏了其他的。

public void actionPerformed(ActionEvent e) 
{ 
    lis = (JComboBox) e.getSource(); 
    String name = (String) lis.getSelectedItem(); 
    tf.setText(name); 

    if (map.containsKey(name)) 
    { 
     if (pop != null) 
      this.remove(pop); 
     pop = new JComboBox(map.get(name)); 
     pop.setBounds(200,100 , 100, 100); 
     add(pop); 
    } 
} 

，而不是添加和刪除的JComboBox或者，你可以只是空的，填充它，隱藏它，當map不包含的關鍵。

Dropit() 
{ 
    setLayout(null); 
    tf = new JTextField(); 
    tf.setBounds(50, 50, 100, 100); 
    add(tf); 
    map.put("mon", mon); 
    map.put("tue", tue); 
    lis = new JComboBox<String>(days); 
    lis.setSelectedItem("sat"); 
    lis.addActionListener(this); 
    lis.setBounds(100,100,100,100); 
    add(lis); 


    pop = new JComboBox<String>(); 
    pop.setBounds(200,100 , 100, 100); 
    pop.setVisible(false); 
    add(pop); 
    setVisible(true); 
    setSize(500,500); 
} 

public void actionPerformed(ActionEvent e) 
{ 
    lis = (JComboBox<String>) e.getSource(); 
    String name = (String) lis.getSelectedItem(); 
    tf.setText(name); 

    if (map.containsKey(name)) 
    { 
     pop.removeAllItems(); 
     for (String s: map.get(name)) 
      pop.addItem(s); 
     pop.setVisible(true); 
    } else 
     pop.setVisible(false); 
}