问题描述
如果用户在 inputDialog 上单击取消,如何处理?我尝试过之前发布的解决方案,但都没有奏效。
这是我的代码
{{1}}
解决方法
试试这个:
String bidString;
while (true) {
bidString = JOptionPane.showInputDialog(null,"Place your bid ","Bid",JOptionPane.PLAIN_MESSAGE);
if (bidString == null) {
System.out.println("cancelled");
break;
}
if (bidString.isEmpty()) {
System.out.println("wrong entry");
JOptionPane.showMessageDialog(null,"You must enter a value","The Numbers Game",JOptionPane.ERROR_MESSAGE);
continue;
}else{
try {
int bid = Integer.parseInt(bidString);
} catch (NumberFormatException nfe) {
System.out.println("no number entered");
continue;
}
break;
}
}