Java輸入輸出重新導向代碼__Java

 try {  
BufferedInputStream in = new BufferedInputStream(new FileInputStream("input.txt"));
 System.setIn(in);
 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

 
PrintStream out = System.out; // 儲存原輸出資料流
PrintStream ps=new PrintStream("./output.txt"); // 建立檔案輸出資料流
System.setOut(ps); // 設定使用新的輸出資料流

// String s;
//  while((s = br.readLine())!=null)
//  System.out.println(s);
 
 
} catch (FileNotFoundException e) { 
e.printStackTrace(); 
} catch (IOException e) {
// TODO 自動產生的 catch 塊
e.printStackTrace();
} 
try{PrintStream out =
new PrintStream(
new BufferedOutputStream(
new FileOutputStream("test.out")));}
  catch(IOException e) {
e.printStackTrace();
}