java - 似乎无法让 JOptionPane 下拉菜单正常工作

Question

我很确定应该没问题，但我不断收到此警告!

String[] trollDo= {"Try and sneak the horses away.",
                   "Go back and tell the others.", 
                   "Kill the trolls."};
String trollChoice =(String) JOptionPane.showInputDialog(null,
           "What will "+playerName+" do?",null,JOptionPane.QUESTION_MESSAGE,
           trollDo,trollDo[0]);

Answer 1

您应该会收到编译错误，例如...

error: no suitable method found for showInputDialog(<null>,String,<null>,int,String[],String)
    String trollChoice = (String) JOptionPane.showInputDialog(
                                             ^
    method JOptionPane.showInputDialog(Object) is not applicable
      (actual and formal argument lists differ in length)
    method JOptionPane.showInputDialog(Object,Object) is not applicable
      (actual and formal argument lists differ in length)
    method JOptionPane.showInputDialog(Component,Object) is not applicable
      (actual and formal argument lists differ in length)
    method JOptionPane.showInputDialog(Component,Object,Object) is not applicable
      (actual and formal argument lists differ in length)
    method JOptionPane.showInputDialog(Component,Object,String,int) is not applicable
      (actual and formal argument lists differ in length)
    method JOptionPane.showInputDialog(Component,Object,String,int,Icon,Object[],Object) is not applicable
      (actual and formal argument lists differ in length)
1 error

这意味着您缺少icon参数...

String trollChoice = (String) JOptionPane.showInputDialog(
                null,
                "What will " + playerName + " do?", 
                null,
                JOptionPane.QUESTION_MESSAGE,
                null, // This one here
                trollDo, 
                trollDo[0]);

确保您正在咨询 JavaDocs并使用您的 IDE 选择和填充方法参数