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-...
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...
而自Java 9 起,资源的声明与创建可以移出到try-with-resources块外,而仅需将引用资源的变量放在try-with-resources块内即可。 示例如下: // src/test/java/TryWithResourcesTest#testJava9ReadFileWithMultipleResources @Test public void testJava9ReadFileWithMultipleResources() throws IOException { String filePa...
// try-with-resources on multiple resources - short and sweetstaticvoidcopy(Stringsrc,Stringdst)throws IOException{try(InputStreamin=newFileInputStream(src);OutputStreamout=newFileOutputStream(dst)){byte[]buf=newbyte[BUFFER_SIZE];intn;while((n=in.read(buf))>=0)out.write(buf,0,n);}} ori...
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{ ...
3. try-with-resources with multiple resources We can use the semicolon:to declare multiple resources in atry-with-resourcesblock. The multiple resources are automatically closed after the try block. // try-with-resourcestry(InputStreaminStream=newFileInputStream(newFile(from));OutputStreamoutStream...
以下是使用try-with-resources 的第二个范例 //try-with-resources on multiple resources - short and sweetstatic voidcopy7(String src,String dst)throws IOException{int BUFFER_SIZE=2048;try(InputStreamin=newFileInputStream(src);OutputStream out=newFileOutputStream(dst)){byte[]buf=newbyte[BUFFER_SIZE...
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...
4.During initialization of multiple resources in ‘try’, if there is any issue then immediately in the reverse order those resources that are already initialized will be closed. try中的多个资源在初始化过程中,一旦发生异常,那些已经完成初始化的资源,将按照与其创建时相反的顺序依次关闭。
The try-with-resources syntax allows for the declaration of multiple resources in the try-with-resources list, but it is crucial that all these resources implement the java.lang.AutoCloseable interface. By implementing AutoCloseable, resources can define their own close() method, which will be ...