scala讀寫文件 comparing values of types Unit and Int using `!=' will always yield true

因爲scala沒有對寫入文件的支持,因此寫文件時一般藉助java進行IO操做

 1 //方式一(小文件)
 2 
 3   /* val s1 = Source.fromFile("D:\\inputword\\hello.txt","GBK");  4  val buffer = s1.toList.toArray  5 
 6  val des = new PrintWriter("C:\\Users\\Administrator\\Desktop\\scalatest.txt");  7 
 8  des.write(buffer,0,buffer.length);  9  des.flush(); 10  des.close(); 11  s1.close(); 12   */
13 
14   //方式二(大文件)
15   val s2 = Source.fromFile("C:\\Users\\Administrator\\Desktop\\log.data", "UTF-8"); 16 
17   val buffer = new Array[Char](1024); 18   val des = new PrintWriter("C:\\Users\\Administrator\\Desktop\\scalatest.txt"); 19 
20   val reader = s2.reader(); 21 
22   var count: Int = 0; 23 
24   while ({ count = reader.read(buffer); count } != -1) { 25     des.write(buffer, 0, buffer.length); 26  } 27 
28   //錯誤(comparing values of types Unit and Int using `!=' will always yield true),在java中這麼寫沒問題,但在scala中賦值過程自己返回的是Unit,若是你想這麼用,參考上面的while循環,使用賦值語句塊便可
29   /*while((count = reader.read(buffer)) != -1) { 30 
31  }*/
32 
33  des.close(); 34  des.flush(); 35   s2.close();