Reader rd=null;?? ??? ?char[]ch=null;?? ??? ?int length=0;?? ??? ?StringBuffer sb=new StringBuffer();?? ??? ?try {?? ??? ??? ?rd=new FileReader("d:/aa.txt");--------文件里的內(nèi)容是：我愛學(xué)java！?? ??? ??? ?ch=new char[1];?? ??? ??? ?length=rd.read(ch);?? ??? ??? ?while(length!=-1){?? ??? ??? ??? ?sb.append(ch);?? ??? ??? ??? ?length=rd.read(ch);?? ??? ??? ?}?? ??? ??? ?System.out.println(sb.toString());---------------輸出我愛學(xué)java！?? ?? 當(dāng)? ch=new char[5];輸出我愛學(xué)java!ja? ------------------這是為什么啊 ！