Java基础进阶IO流-FileReader，FileWriter字符流

public class FileReaderTest {
    public static void main(String[] args) {
        FileReader reader = null;
        try {
            reader = new FileReader("IO/src/com/newstudy/javase/io/temp4.txt");
            //准备一个char数组
            char[] chars = new char[4];
            // 往char数组中读，一次只能读取四个字节
            reader.read(chars); // 按照字符的方式读取：第一次e，第二次f，第三次 风....
            for(char c : chars) {
                System.out.print(c);//别把c错写成chars了
            }
            //按照字符流的方式读,每次读四个字符
            /*char[] chars = new char[4];
            int readerCount = 0;
            while((readerCount = reader.read(chars)) != -1){
                System.out.print(new String(chars,0,readerCount));
            }*/
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(reader != null){
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

public class FileWriterTest {
    public static void main(String[] args) {
        FileWriter out = null;
        try {
            out = new FileWriter("file",true);
            //用字符串方式写入
            char[] chars = {'我','是','中','国','人'};//API方法
            out.write(chars);
            out.write(chars,2,3);
            //用字符串写入
            out.write("我是一名java软件工程师！");
            out.write("\n");
            out.write("HelloWorld!");
            //刷新
            out.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if(out != null){
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}