Java基础学习之字符缓冲流的应用

public class BufferedStreamDemo01 {
    public static void main(String[] args) throws IOException {
        //BufferedWriter(Writer out) 
        BufferedWriter bw = new BufferedWriter(new FileWriter("myCharStream\\bw.txt"));
 
        bw.write("hello\r\n");
        bw.write("world\r\n");
        bw.close();
 
        //BufferedReader(Reader in) 
        BufferedReader br = new BufferedReader(new FileReader("myCharStream\\bw.txt"));
 
        //一次读取一个字符数据 
        int ch; 
        while ((ch=br.read())!=-1) { 
            System.out.print((char)ch); 
        } 
 
        //一次读取一个字符数组数据 
        char[] chs = new char[1024];
        int len;
        while ((len=br.read(chs))!=-1) {
            System.out.print(new String(chs,0,len));
        }
        br.close();
    }
}

public class CopyJavaDemo01 {
    public static void main(String[] args) throws IOException {
        //根据数据源创建字符缓冲输入流对象 
        BufferedReader br = new BufferedReader(new FileReader("myCharStream\\ConversionStreamDemo.java"));
        //根据目的地创建字符缓冲输出流对象 
        BufferedWriter bw = new BufferedWriter(new FileWriter("myCharStream\\Copy.java"));
        
        //读写数据，复制文件 
        //一次读写一个字符数据 
        int ch; 
        while ((ch=br.read())!=-1) { 
            bw.write(ch); 
        } 
 
        //一次读写一个字符数组数据 
        char[] chs = new char[1024];
        int len;
        while ((len=br.read(chs))!=-1) {
            bw.write(chs,0,len);
        }
 
        //释放资源 
        bw.close();
        br.close();
    }
}

public class BufferedStreamDemo02 {
    public static void main(String[] args) throws IOException {
        //创建字符缓冲输出流 
        BufferedWriter bw = new BufferedWriter(new FileWriter("myCharStream\\bw.txt"));
 
        //写数据 
        for (int i = 0; i < 10; i++) {
            bw.write("hello" + i);
            //bw.write("\r\n"); 
            bw.newLine();
            bw.flush();
        }
 
        //释放资源 
        bw.close();
 
        //创建字符缓冲输入流 
        BufferedReader br = new BufferedReader(new FileReader("myCharStream\\bw.txt"));
        
        String line;
        while ((line=br.readLine())!=null) {
            System.out.println(line);
        }
 
        br.close();
    }
}

public class CopyJavaDemo02 {
    public static void main(String[] args) throws IOException {
        //根据数据源创建字符缓冲输入流对象 
        BufferedReader br = new BufferedReader(new  FileReader("myCharStream\\ConversionStreamDemo.java"));
        //根据目的地创建字符缓冲输出流对象 
        BufferedWriter bw = new BufferedWriter(new FileWriter("myCharStream\\Copy.java"));
 
        //读写数据，复制文件 
        //使用字符缓冲流特有功能实现 
        String line;
        while ((line=br.readLine())!=null) {
            bw.write(line);
            bw.newLine();
            bw.flush();
        }
 
        //释放资源 
        bw.close();
        br.close();
    }
}