流的append

StringBuffer的引用
 1 public static void main(String[] args) throws IOException {
 2 
 3         File file = new File("a.txt");
 4 
 5         Reader reader = new FileReader(file);
 6 
 7         System.out.println((char) reader.read());
 8 
 9         char[] cbuf = new char[5];
10         reader.read(cbuf);
11         System.out.println(new String(cbuf));
12 
13         char[] chars = new char[1024];
14         int len = -1;
15         StringBuffer stringBuffer = new StringBuffer();
16         while ((len = reader.read(chars)) != -1) {
17             stringBuffer.append(chars, 0, len);
18 
19         }
20 
21         System.out.println(stringBuffer.toString());
22 
23         reader.close();
24 
25     }

调用方法的参数追加

 1 public class CopeText {
 2     public static void main(String[] args) throws IOException {
 3         cope();
 4     }
 5     
 6     private static void cope() throws IOException {
 7         FileReader fr=new FileReader("a.txt");
 8         FileWriter fw=new FileWriter("b.txt",true);
 9         char[] buff=new char[1024];
10         int len=-1;
11         if((len=fr.read(buff))!=-1){
12             
13             fw.write(buff,0,len);
14         }
15         fw.close();
16         fr.close();
17     }
18 }