向txt里读写内容及把读取的内容放进一个数组里

话不多说，代码如下

public class Test {
    public static void main(String[] args) throws IOException {
        //写入文件的地址
        String string = "C:\\Users\\Administrator\\Desktop\\集合\\b.txt";
        File f = new File(string);
        FileOutputStream fop  = new FileOutputStream(f);
        //编码
        OutputStreamWriter writer = new OutputStreamWriter(fop,"utf-8");
        //输入文字
        writer.append("这是第一行!");
        writer.append("\r\n");
        writer.append("");
        writer.append("\r\n");
        writer.append("这是第三行!");
        //关闭流
        writer.close();

        FileInputStream fip = new FileInputStream(f);
        InputStreamReader reader = new InputStreamReader(fip,"utf-8");
        StringBuffer sb = new StringBuffer();
        while (reader.ready()){
           sb.append((char)reader.read());
        }
        System.out.println(sb.toString());
        fip.close();
        //把读取的内容放进数组里
        putArray(string);
    }

    private static void putArray(String string) throws IOException{
        FileReader fileReader = new FileReader(string);
        BufferedReader buf = new BufferedReader(fileReader);
        String readLine = "";
        List<String> stringList = new ArrayList<>();
        while((readLine = buf.readLine()) != null){
            stringList.add(readLine);
        }
        for (String str :stringList ){
            System.out.println(str);
        }
    }    
}