Java File System Int or Double

Question

I have 3 text files. Numbers.txt have int and double values like 1 1.5 2... I wanna put my int values to my Int.txt and double values to Double.txt. So how can I do?

I tried .hasNextDouble() or .hasNextInt()

public static void main(String[] args) {
File f = new File("a.rtf");
File fWrite = new File("aWrite");
try {

    FileReader fr = new FileReader(f);
    FileWriter fw = new FileWriter(fWrite);
    double c = fr.read();
    while(c != -1){
        char k = (char)c;
        c.hasNextDouble();
        System.out.print(k + " ");
        fw.write((int) c);
        c = fr.read();
    }
    fr.close();
    fw.close();
} catch(Exception e) {
    e.printStackTrace();

}

I am new in Java. What else can I try?

Answer 1

You can try this:

Writer wr = new FileWriter("aWrite.txt");
wr.write(String.valueOf(1)); 
wr.write(String.valueOf(1.5));
wr.write(String.valueOf(2));

wr.flush();
wr.close();

Or this approach which is mainly better for bigger data:

File file = new  File("aWrite.txt");
BufferedWriter out = new BufferedWriter(new FileWriter(file));
out.write("Write the string to text file");
out.newLine();