[英]read file, convert string to double, store in 2d array
我需要讀取文件中的數字列表並將其存儲到2d數組中。 到目前為止,這就是我所擁有的。 我將如何實現這一目標?
//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,其中:
1.01
0.03
2.14
0.47
//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();
}
代替
String[][] myarray = new String[5][12];
采用
double[][] myarray = new double[5][12];
然后將其放入循環中:
myarray[j][i] = Double.parseDouble(infile.readLine());
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