1.6和以前是这样的，但这样的缺点是finally中也可能报错（如关闭流）：

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

1.7新增try-with-resources 语句：

try (BufferedReader br = new BufferedReader(new FileReader(""))) {
            br.readLine();
        }

1.7中只要实现了AutoCloseable或Closeable接口的类或接口，都可以使用try-with-resource来实现异常处理和资源关闭。

public abstract class Reader implements Readable, Closeable

public interface Closeable extends AutoCloseable