这里是一个很好的解决方案。
在你的代码中，你可以创建一个名为 lastLine 的辅助变量，并不断地将其重新初始化为当前行，如下所示：

Here's a good solution.

In your code, you could just create an auxiliary variable called lastLine and constantly reinitialize it to the current line like so:

    String lastLine = "";

    while ((sCurrentLine = br.readLine()) != null) 
    {
        System.out.println(sCurrentLine);
        lastLine = sCurrentLine;
    }