java - 如何将数组写入文件Java

Question

我一直在尝试将数组写入文件。我知道如何将整数或字符串写入文件，但带数组让我感到困惑。我现在正在使用这个:

public static void write (String file, int[]x) throws IOException{
    BufferedWriter outputWriter = null;
    outputWriter = new BufferedWriter(new FileWriter(filename));
    outputWriter.write("hi");// Here I know i cant just write x[0] or anything. Do i need 
                             //to loop in order to write the array?
    outputWriter.newLine();
    outputWriter.flush();  
    outputWriter.close();  



}

Answer 1

就像其他人说的，你可以遍历数组并一个一个地打印出元素。要使输出显示为数字而不是您所看到的“字母和符号”，您需要将每个元素转换为字符串。所以你的代码变成这样:

public static void write (String filename, int[]x) throws IOException{
  BufferedWriter outputWriter = null;
  outputWriter = new BufferedWriter(new FileWriter(filename));
  for (int i = 0; i < x.length; i++) {
    // Maybe:
    outputWriter.write(x[i]+"");
    // Or:
    outputWriter.write(Integer.toString(x[i]);
    outputWriter.newLine();
  }
  outputWriter.flush();  
  outputWriter.close();  
}

如果你只想打印出像[1, 2, 3, ....]这样的数组，你可以用下面的代码替换循环:

outputWriter.write(Arrays.toString(x));