When multiple declarations are made, thetry-with-resourcesstatement closes these resources in reverse order. In this example, thePrintWriterobject is closed first and then theScannerobject is closed. Java 9 try-with-resources enhancement In Java 7, there is a restriction to thetry-with-resourcesst...
try-with-resources 是 Java 7 引入的一种简洁的资源管理方式,适用于需要在使用后自动关闭的资源(如文件、数据库连接、网络连接等)。try-with-resources 能够很容易地关闭在 try-catch 语句块中使用的资源,所谓的资源(resource)是指在程序完成后,必须关闭的对象。
importjava.io.*;publicclassTryWithResourcesExample{publicstaticvoidmain(String[]args){try(BufferedReaderreader=newBufferedReader(newFileReader("example.txt"))){Stringline;while((line=reader.readLine())!=null){System.out.println(line);}}catch(FileNotFoundExceptione){System.out.println("文件未找到: ...
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 public void testJava7ReadFileWithMultipleResources(...
Since Java 7, the try-with-resources statements allow declaring AutoCloseable resources in a try block that JVM will close automatically.
try-with-resources是 Java 7 引入的一个语言特性,用于简化资源管理(比如文件或数据库连接)的代码。在 Java 中,通常需要在使用完资源后手动关闭它们,以防止资源泄漏。try-with-resources语句可以在代码块结束时自动关闭实现了AutoCloseable或Closeable接口的资源。
try-with-resources 块:声明并初始化一个或多个实现了AutoCloseable 接口的资源对象。 资源会在try 块结束时自动关闭,即使发生异常也会执行。 3.2 示例 以下是一个使用try-with-resources 的简单例子: import java.io.*; public class TryWithResourcesExample { ...
下面是一个使用try-with-resources语句处理文件的例子: import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; public class TryWithResourcesExample { public static void main(String[] args) { try (BufferedReader br = new BufferedReader(new FileReader("file.txt"))) {...
In this article, we discussed how to use try-with-resources and how to replacetry,catch, andfinallywith try-with-resources. We also looked at building custom resources withAutoCloseableand the order in which resources are closed. The completesource codefor the example is available inthis GitHub...
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()throwsIOException{ ...