我正试图用JavaSwing开发一个日历应用程序。我有3个jComboBox,您可以在其中选择年、月和日,每次尝试选择年时,我都会遇到此错误:
Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: For input string: "Select Month"
at java.base/java.lang.NumberFormatException.forInputString(NumberFormatException.java:68)
at java.base/java.lang.Integer.parseInt(Integer.java:652)
at java.base/java.lang.Integer.parseInt(Integer.java:770)
at calendar.Show$1.itemStateChanged(Show.java:315)
at java.desktop/javax.swing.JComboBox.fireItemStateChanged(JComboBox.java:1227)
at java.desktop/javax.swing.JComboBox.selectedItemChanged(JComboBox.java:1279)
at java.desktop/javax.swing.JComboBox.contentsChanged(JComboBox.java:1335)
at java.desktop/javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:123)
//......//
我想问题出在我代码的这一部分:
jcbyear3.addItemListener (new ItemListener() {
@Override
public void itemStateChanged(ItemEvent arg0) {
int y = Integer.parseInt(String.valueOf(arg0.getItem()));
//String mont= String.valueOf(monthjcb.getSelectedItem());
String monthin = String.valueOf(monthjcb.getSelectedItem());
String mont = monthin == null || monthin.isEmpty() || monthin.equals("Select Month") ? "January" : monthin;
//int d=Integer.parseInt(String.valueOf(dayjcb.getSelectedItem()));
String dayin = String.valueOf(monthjcb.getSelectedItem());
int d = dayin == null || dayin.isEmpty() || dayin.equals("Select Day") ? 1 :Integer.parseInt(dayin) ;
int m=0;
if(mont.equals("January")) {
m=1;
}
else if(mont.equals("February")) {
m=2;
}
//.....//
String[] h=store.search(y, m, d);
if(h[0].equals("0"))
dayarea.setText("No events found");
else if(h[0].equals("1")){
dayarea.setText(h[1]);
}
else if(h[0].equals("2")){
dayarea.setText(h[1]+"\n"+h[2]);
}
else if(h[0].equals("3")){
dayarea.setText(h[1]+"\n"+h[2]+"\n"+h[3]);
}
else {
dayarea.setText(h[1]+"\n"+h[2]+"\n"+h[3]+"\n"+h[4]+"\n"+h[5]);
}
}
});
有人能帮我纠正一下我的问题吗?
1条答案
按热度按时间wmomyfyw1#
这条线
他会还给你的
"Select Month"
然后在你再次要求同样的东西的那一天(即。,monthjcb.getSelectedItem()
):所以dayin=
"Select Month"
正因为如此,你将在有条件的情况下达到:这部分
Integer.parseInt(dayin)
导致java.lang.NumberFormatException: For input string: “Select Month”
因为您试图从不包含编码的数值的字符串中提取整数。根据你的评论,我想说:
你可能想要: