不知道如何投射轉換值java7

Question

我從版本4開始就沒有使用過java，並且接縫已經改變到幾乎令人討厭的地步。我不明白如何處理下面的編譯錯誤。

HelloWorld.java:70: error: no suitable method found for add(Series) lineChart.getData().add(series); ^ method List.add(int,Series) is not applicable (actual and formal argument lists differ in length) method List.add(Series) is not applicable (actual argument Series cannot be converted to Series by method invocation conversion)

這裏是我的代碼：

import javafx.application.Application; 
import javafx.scene.Scene; 
import javafx.scene.chart.LineChart; 
import javafx.scene.chart.NumberAxis; 
import javafx.scene.chart.XYChart; 
import javafx.scene.chart.*; 
import javafx.stage.Stage; 
import javafx.geometry.Side; 
import java.lang.*; 
import java.net.*; 
import java.io.*; 
import java.util.*; 




public class HelloWorld extends Application { 

    @Override public void start(Stage stage) { 


     Vector <String[]> v = new Vector<String[]>(); 

     try{ 

       File f = new File("audjpy.txt"); 
       BufferedReader br = new BufferedReader(new FileReader(f)); 
       String line; 
       String[] data; 
       int count = 0; 
       while ((line = br.readLine()) != null) { 
         data = line.split(","); 
         if(count>0)v.add(data); 
         if(count == 400)break; 
         count++; 
       } 
       br.close(); 
     }catch(IOException e){System.out.println(e);} 




     stage.setTitle("Line Chart Sample"); 
     //defining the axes 
     NumberAxis xAxis = new NumberAxis(); 
     NumberAxis yAxis = new NumberAxis(); 
     yAxis.setSide(Side.RIGHT); 
     xAxis.setLabel("Number of Month"); 
     //creating the chart 
     final LineChart<Number,Number> lineChart = 
       new LineChart<Number,Number>(xAxis,yAxis); 

     lineChart.setTitle("Stock Monitoring, 2010"); 

     //defining a series 
     XYChart.Series<Double, Double> series = new XYChart.Series<Double, Double>(); 
     series.setName("My portfolio"); 

     //populating the series with data 
     //<TICKER>,<DTYYYYMMDD>,<TIME>,<OPEN>,<HIGH>,<LOW>,<CLOSE>,<VOL> 
    Enumeration<String[]> e = v.elements(); 
    while(e.hasMoreElements()){ 
     String[] data = e.nextElement(); 
      double x = Double.parseDouble(data[4]); 
      double y = Double.parseDouble(data[5]); 
      series.getData().add(new XYChart.Data<Double, Double>(x,y)); 
     } 

     Scene scene = new Scene(lineChart,800,600); 
     lineChart.getData().add(1, series); 

     stage.setScene(scene); 
     stage.show(); 
    } 


    public static void main(String[] args) { 
     launch(args); 
    } 
} 

Answer 1

的原因好像是因爲你使用Double和Number互換，每個通用更改爲Number和你的問題應該得到解決。

@Override 
public void start(Stage stage) { 


    Vector<String[]> v = new Vector<String[]>(); 

    try { 

     File f = new File("audjpy.txt"); 
     BufferedReader br = new BufferedReader(new FileReader(f)); 
     String line; 
     String[] data; 
     int count = 0; 
     while ((line = br.readLine()) != null) { 
      data = line.split(","); 
      if (count > 0) { 
       v.add(data); 
      } 
      if (count == 400) { 
       break; 
      } 
      count++; 
     } 
     br.close(); 
    } catch (IOException e) { 
     System.out.println(e); 
    } 




    stage.setTitle("Line Chart Sample"); 
    //defining the axes 
    NumberAxis xAxis = new NumberAxis(); 
    NumberAxis yAxis = new NumberAxis(); 
    yAxis.setSide(Side.RIGHT); 
    xAxis.setLabel("Number of Month"); 
    //creating the chart 
    final LineChart<Number, Number> lineChart = new LineChart<Number, Number>(xAxis, yAxis); 

    lineChart.setTitle("Stock Monitoring, 2010"); 

    //defining a series 
    XYChart.Series<Number, Number> series = new XYChart.Series<Number, Number>(); 
    series.setName("My portfolio"); 

    //populating the series with data 
    //<TICKER>,<DTYYYYMMDD>,<TIME>,<OPEN>,<HIGH>,<LOW>,<CLOSE>,<VOL> 
    Enumeration<String[]> e = v.elements(); 
    while (e.hasMoreElements()) { 
     String[] data = e.nextElement(); 
     double x = Double.parseDouble(data[4]); 
     double y = Double.parseDouble(data[5]); 
     series.getData().add(new XYChart.Data<Number, Number>(x,y)); 
    } 

    Scene scene = new Scene(lineChart, 800, 600); 
    lineChart.getData().add(1, series); 

    stage.setScene(scene); 
    stage.show(); 
}