021.5 IO流——字符流

FileWriter fw = new FileWriter("xxx.txt");
fw.write("哈喽");
fw.close();

FileReader fr = new FileReader("xxx.txt");
int ch = 0;
while((ch = fr.read()) != -1){
    System.out.println((char)ch);
}
fr.close();

private static void writeTextByBuffered() throws IOException
{
    FileWriter fw = new FileWriter("char_xxx.txt");
    BufferedWriter bw = new BufferedWriter(fw);
    bw.write("小红");
    bw.newLine();
    bw.write("小花，小华");
    bw.flush();
    bw.close();
}

private static void writeTextByBuffered() throws IOException
{
    FileWriter fw = new FileWriter("char_xxx.txt");
    BufferedWriter bw = new BufferedWriter(fw);
    bw.write("小红");
    bw.newLine();
    bw.write("小花，小华");
    bw.flush();
    bw.close();
}