当我尝试运行我的java fxml应用程序时,netbeans出现错误。运行Java FXML程序时出错
这里是我得到的错误:
产生的原因:在apnc7dsimulator.UIController.handleStart(UIController.java:4 2)apnc7dsimulator.UIController.handleNew(UIController显示java.lang.NullPointerException。的java:37)在apnc7dsimulator.UIController.initialize(UIController.java:31)在javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2548)... 17更
它出现的误差被始发从我的控制器。这里是我的代码:
public class UIController implements Initializable {
@FXML
private TextArea screen;
@FXML
private TextField commandLine;
private Login login;
@Override
public void initialize(URL location, ResourceBundle resources) {
handleNew();
}
public void handleNew(){
screen.clear();
commandLine.clear();
handleStart();
}
public void handleStart(){
login.loginSys(screen);
}}
代码控制器引用是这样的:
public class Login implements PrintToScreen{
@Override
public void print(String text, TextArea screen) {
screen.appendText(text);
}
@Override
public String read(TextArea screen) {
Scanner scanner = new Scanner(System.in);
String readString = scanner.nextLine();
while(readString != null){
print(readString,screen);
if(scanner.hasNextLine()){
readString = scanner.nextLine();
}
else{
readString = null;
}
}
return readString;
}
public void loginSys (TextArea screen)
{
String user = "...";
String pass = "...";
print("Please Enter Username:",screen);
user = read(screen);
print("Please Enter Password:",screen);
pass = read(screen);
print("Check Credentials... Please Wait.",screen);
}}
我敢肯定,这是一个简单的错误,我正在做或某种约定,我不能正常以下,但这让我难住了一段时间。 任何帮助将是伟大的。
谢谢,这似乎已经解决了,不能相信我错过了那。 –