Java向txt中写入数据和读取数据

    起源：需要向txt中存储单片机采集来的脉搏数据，数据类型：float

package com.company;

import com.mathworks.toolbox.javabuilder.MWException;
import purehr.PureHearRate;
import java.io.*;
import java.util.ArrayList;
import java.util.Random;

public class Main {

    private static ArrayList<Float> dataGroup;

    public static void main(String[] args) {
        // write your code here
        //**************************读取
        File file = new File("C:\Users\Administrator\Desktop\TXT\a.txt");
        try {
            FileReader fr = new FileReader(file);
            BufferedReader br = new BufferedReader(fr);

            String readData;
            dataGroup = new ArrayList<>();

            while((readData = br.readLine())!=null){
                try{
                    dataGroup.add(Float.parseFloat(readData));//读出所有数据，存入ArrayList中
                }catch (Exception e){
                    e.printStackTrace();
                }
            }

            br.close();
            fr.close();

            System.out.println(dataGroup.toString());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        //*************************写入
        File file1 = new File("C:\Users\Administrator\Desktop\TXT\bbb.txt");
        try {
            FileWriter fw = new FileWriter(file1);
            BufferedWriter bw = new BufferedWriter(fw);

            for(int i = 0; i<dataGroup.size();i++){
                bw.write(dataGroup.get(i).toString()+"\n");
                bw.flush();
            }
            bw.close();
            fw.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
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