java - 如何使用 Java7 try-with-resources 特性将资源作为参数传递

Question

我看过java7 try-with-resources .如果可关闭资源作为参数，我们不需要声明资源。对于这种情况，我们如何使用此功能？

public static void write(byte[] b, OutputStream os) throws Exception {
    try {
        os.write(b);
    }
    catch(Exception e) {
        logger.log(Level.INFO, "Exception in writing byte array");
    }
    finally {
        try {
            if(os != null) {
                os.close();
            }
        }catch(Exception e) {
            logger.log(Level.INFO, "Exception while close the outputstream");
            throw e;
        }
    }
}

Answer 1

你可以简单地写:

static void write(byte[] b, OutputStream os) throws Exception {
    try (OutputStream o = os) {
        o.write(b);
    }
}