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                # 2-17.16、文件讀寫,實現一個計數器 ``` public int getNum(){ int i = -1; try{ String stri=""; BufferedReader in = new BufferedReader(new FileReader(f)); while((stri=in.readLine())!=null){ i = Integer.parseInt(stri.trim()); } in.close(); }catch(Exception e){ e.printStackTrace(); } return i; } public void setNum(){ int i = getNum(); i++; try{ PrintWriter out=new PrintWriter(new BufferedWriter(new FileWriter(f,false))); out.write(String.valueOf(i)); //可能是編碼的原因,如果直接寫入int的話,將出現java編碼和windows編碼的混亂,因此此處寫入的是String out.close() ; }catch(Exception e){ e.printStackTrace(); } } ```
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