讀取文件，將字符串轉換爲double，存儲在2d數組中

Question

我需要讀取文件中的數字列表並將其存儲到2d數組中。 這是我到目前爲止。我將如何去實現這個目標？

//this is only part of my code 
public class RainFall 
{ 

    double[][] precip; 

    public RainFall() 
    { 
     precip = new double [5][12]; 
    } 

    public void readFile(BufferedReader infile) throws IOException 
    { 
     FileInputStream infile = new FileInputStream("numbers.dat"); 
     BufferedReader br = new BufferedReader(new InputStreamReader(infile)); 

     String[][] myarray = new String[5][12]; 
     while (infile.readLine() != null) 
     { 
      for (int j = 0; j < 5; j++) 
      { 
       for (int i = 0; i < 12; i++) 
       { 
        myarray[j][i] = infile.readLine(); 
       } 

      } 


     } 
     infile.close(); 
    } 

numbers.dat是60行：

1.01
0.03
2.14
0.47

Answer 1

//Is each number on a new line? You're very close, I added a few lines below. 

    public class RainFall 

{ 

    double[][] precip; 

    public RainFall() 
    { 
     precip = new double [5][12]; 
    } 

    public void readFile(BufferedReader infile) throws IOException 
    { 
     //FileInputStream infile = new FileInputStream("numbers.dat"); 
     BufferedReader br = new BufferedReader(new FileReader("numbers.dat")); 
     String line = ""; 
     String[][] myarray = new String[5][12]; 

     while ((line = br.readLine()) != null) 
     { 
      double num = Double.parseDouble(line.trim()); 
      for (int j = 0; j < 5; j++) 
      { 
       for (int i = 0; i < 12; i++) 
       { 
        precip[j][i] = num; 
       } 

      } 


     } 
     br.close(); 
    } 

Answer 2

代替

String[][] myarray = new String[5][12]; 

ù SE

double[][] myarray = new double[5][12]; 

然後再轉到這個循環：

myarray[j][i] = Double.parseDouble(infile.readLine());