用fileWriter重写一行

Question

我是新手在java中我有一个程序在txt文件上写入信息，我似乎唯一的问题是如果fileWriter附加了我无法编辑的文件，或者重写了一个特定的行文件，有没有办法设置编写器在文件的开头而不是结束而不删除数据？因为这样我就无法编辑文件中的信息。 提前感谢您的回答！

Answer 1

FileWriter类有几个构造函数。其中一些人用＆＃34;追加＆＃34; boolean类型的参数。你使用true构造函数之一了吗？

您应该使用false作为该参数。

    /**
 * Constructs a FileWriter object given a File object. If the second
 * argument is <code>true</code>, then bytes will be written to the end
 * of the file rather than the beginning.
 *
 * @param file  a File object to write to
 * @param     append    if <code>true</code>, then bytes will be written
 *                      to the end of the file rather than the beginning
 * @throws IOException  if the file exists but is a directory rather than
 *                  a regular file, does not exist but cannot be created,
 *                  or cannot be opened for any other reason
 * @since 1.4
 */
public FileWriter(File file, boolean append) throws IOException {
    super(new FileOutputStream(file, append));
}