寫入一個文件，但只保存最後一行

Question

我想複製一個文本文件，但是當代碼完成執行時，我只有文件的最後一行文本。顯然scanLine()保持覆蓋相同的線，但我不能解決這個問題。有任何想法嗎？

do{     
    try{ 
    FileWriter name = new FileWriter("/home/fok/Desktop/out"); 
    BufferedWriter out = new BufferedWriter(name); 
    a=x.nextLine();scanner x grabs next line and sets it string a 
    out.write(a);//writes a to file 
    out.close();//closees file 
    } catch (IOException ioe){ 
    System.out.println("file writer error"); 
    } 

} while(x.hasNext()); 

Answer 1

這很簡單，你正在關閉並打開for循環內的文件。

public void readfile(){ 
    try {   
    FileWriter name = new FileWriter("/home/fok/Desktop/out"); 
    BufferedWriter out = new BufferedWriter(name); 
     do {     
     a=x.nextLine();scanner x grabs next line and sets it string a 
     out.write(a);//writes a to file 
     } while(x.hasNext()); 
     out.close();//closees file 
    } catch (IOException ioe){ 
     System.out.println("file writer error"); 
    } 
}