3 Java 7:try-with-resources 自动资源关闭 使用Java 7try-with-resources特性可以省去编写手动关闭资源的代码,即try块内的语句执行完成时,资源将自动进行关闭。 示例代码如下: // src/test/java/TryWithResourcesTest#testJava7ReadFileWithMultipleResources @Test publicvoidtestJava7ReadFileWithMultipleResources()t...
Thetry-with-resourcesstatement doesautomatic resource management. We need not explicitly close the resources as JVM automatically closes them. This makes the code more readable and easier to write. 2. try-with-resources with multiple resources We can declare more than one resource in thetry-with-...
As shown above, this was especially verbose when declaring multiple resources. As of Java 9 and as part ofJEP 213,we can now usefinalor even effectively finalvariables inside atry-with-resourcesblock: finalScannerscanner=newScanner(newFile("testRead.txt"));PrintWriterwriter=newPrintWriter(newFile...
如下代码使用try-with-resources改写了上面第二个示例: Copy // try-with-resources on multiple resources - short and sweetstaticvoidcopy(String src, String dst)throwsIOException {try(InputStreamin=newFileInputStream(src);OutputStreamout=newFileOutputStream(dst)) {byte[] buf =newbyte[BUFFER_SIZE];i...
使用Java 7try-with-resources特性可以省去编写手动关闭资源的代码,即try块内的语句执行完成时,资源将自动进行关闭。 示例代码如下: // src/test/java/TryWithResourcesTest#testJava7ReadFileWithMultipleResources @Test public void testJava7ReadFileWithMultipleResources() throws IOException { ...
Java 7 新特性:try-with-resources 语句,实现自动资源释放 引言 在Java 7 之前,处理文件、数据库连接等需要手动关闭资源,这不仅增加了代码的复杂性,还容易因为疏忽而造成资源泄露。Java 7 引入了try-with-resources语句,这是一种自动管理资源的新机制,可以确保每个资源在语句结束时都被正确关闭。本文将详细介绍try-...
除了对单个资源进行管理之外,try-with-resources还可以对多个资源进行管理。代码清单1-20给出了try-with-resources语句同时管理两个资源的例子,即经典的文件内容复制操作。 代码清单1-20 使用try-with-resources语句管理两个资源的示例 public class MultipleResourcesUsage { ...
try-with-resources是tryJava中的几条语句之一,旨在减轻开发人员释放try块中使用的资源的义务。 它最初是在Java 7中引入的,其背后的全部想法是,开发人员无需担心仅在一个try-catch-finally块中使用的资源的资源管理。这是通过消除对finally块的需要而实现的,实际上,开发人员仅在关闭资源时才使用块。 此外,使用try...
Try with resources was introduced in Java 7. Until Java 9 you were forced to declare the resources and assign them a value in the parentheses right after try. This is a lot of text and noise, which makes try-with-resources hard to read, especially when using multiple resources. try (Fil...
使用 Java 7try-with-resources 特性可以省去编写手动关闭资源的代码，即 try 块内的语句执行完成时，资源将自动进行关闭。示例代码如下：可以看到，如上测试用例中，将FileReader 与 BufferedReader 的声明与创建，放在了 try 括号内，这样即可以无需手动进行资源关闭了。这其实是一个语法糖，使用该特性...