我是编程新手;放轻松。 :)
我有一个简单的程序(用于学习目的)除非我将两个TextField对象公开,否则将无法编译。我收到一个错误(ava.lang.IllegalAccessException:类javafx.fxml.FXMLLoader $ ValueElement无法使用修饰符“private”访问类firstjavafxprogram.SampleController的成员)。我只是不能为生活弄清楚为什么这两个人必须公开但Label可以是私人的。希望我正确发布我的代码:
package firstjavafxprogram;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
public class SampleController implements Initializable {
@FXML
private Label label;
public TextField txtVolts;
public TextField txtAmps;
@FXML
private void handleButtonAction(ActionEvent event) {
String labelMessage = getTheMessage();
label.setText(labelMessage);
}
@Override
public void initialize(URL url, ResourceBundle rb) {
// TODO
}
@FXML
private String getTheMessage(){
String enteredVolts = txtVolts.getText();
int volts = Integer.parseInt(enteredVolts);
String enteredAmps = txtAmps.getText();
int amps = Integer.parseInt(enteredAmps);
int watts = volts * amps;
String msgString = "Watts: " + Integer.toString(watts);
return msgString;
}
}
答案 0 :(得分:7)
@FXML
private Label label;
public TextField txtVolts;
public TextField txtAmps;
@FXML
private Label label;
@FXML
private TextField txtVolts;
@FXML
private TextField txtAmps;
按此example。