Java7中的try-with-resources

首先，我们看下面的代码。

BufferedReader br = null;
try {
    br = new BufferedReader(new FileReader("test.txt"));
    br.readLine();
} catch (Exception e) {
    e.printStackTrace();
} finally {
    if (br != null)
        try {
            br.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
}BufferedReader br = null;
try {