下拉對話框

Question

我有一個下拉框，從Oracle網站的這個例子：

Object[] possibilities = {"ham", "spam", "yam"}; 
String s = (String)JOptionPane.showInputDialog(
       frame, 
       "Complete the sentence:\n" 
       + "\"Green eggs and...\"", 
       "Customized Dialog", 
       JOptionPane.PLAIN_MESSAGE, 
       icon, 
       possibilities, 
       "ham"); 

//If a string was returned, say so. 
if ((s != null) && (s.length() > 0)) { 
setLabel("Green eggs and... " + s + "!"); 
return; 
} 

//If you're here, the return value was null/empty. 
setLabel("Come on, finish the sentence!"); 

我只是想知道你是如何改變了每個選擇會做什麼？例如，我是否需要在聲明if ((s != null) && (s.length() > 0)) {中更改某些內容，以便我可以編輯第一個字符串項目？

Answer 1

好檢查用戶選擇哪個項目，做一些非常簡單

if ((s != null) && (s.length() > 0)) { 

    if(s.equals(possibilities[0]); 
     //HAM is chosen do something 
    else if(s.equals(possibilities[1]); 
     //spam and so on.......... 
    return; 
}