在Java中按字符複製文件字符

Question

我正在進行一項練習，我必須在Java中按字符複製文件字符。我用下面的文件工作：

Hamlet.txt 
To be, or not to be: that is the question. 
Whether 'tis nobler in the mind to suffer 
The slings and arrows of outrageous fortune, 
Or to take arms against a sea of troubles, 
And by opposing end them ? 

我創建第二個文件，名爲copy.txt其中將包含由Hamlet.txt字符複製的字符的問題是，當我跑我的代碼，copy.txt保持爲空。

import java.io.FileWriter; 
import java.io.BufferedWriter; 
import java.io.PrintWriter; 
import java.io.FileReader; 
import java.io.BufferedReader; 
import java.io.IOException; 

public class Combinations { 
    public void run() { 
     try { 
      BufferedReader rd = new BufferedReader(new FileReader("Hamlet.txt")); 
     PrintWriter wr = new PrintWriter(new BufferedWriter(new FileWriter("copy.txt"))); 
     copyFileCharByChar(rd, wr); 
    }catch(IOException ex) { 
     throw new RuntimeException(ex.toString()); 
    } 
} 

private void copyFileCharByChar(BufferedReader rd, PrintWriter wr) { 
    try { 
     while(true) { 
      int ch = rd.read(); 
      if(ch == - 1) break; 
      wr.print(ch); 
     } 
     } catch(IOException ex) { 
     throw new RuntimeException(ex.toString()); 
    } 
    } 

public static void main(String[] args) { 
    new Combinations().run(); 
} 
} 

所以我寫一個方法copyFileCharByChar這需要在BufferedReader對象rd和FileWriter對象wr。 rd讀取每個單獨的字符，並且wr寫入相應的字符。我在這裏做錯了什麼？

Answer 1

你需要轉換打印在這種情況下：

wr.print((char)ch); 

，或者使用write方法：

wr.write(ch); 

您還需要關閉的PrintWriter：

wr.close();