尝试使用资源vs尝试捕获

Question

我一直在查看代码，并且已经尝试使用资源。我之前使用过标准的try-catch语句，看起来它们在做同样的事情。所以我的问题是“ 尝试使用资源”与“尝试捕获 ”之间的区别是什么，哪个更好。

这是尝试使用资源：

objects jar = new objects("brand");

objects can= new objects("brand");

try (FileOutputStream outStream = new FileOutputStream("people.bin")){

    ObjectOutputStream stream = new ObjectOutputStream(outStream);

    stream.writeObject(jar);

    stream.writeObject(can);

    stream.close();

} catch(FileNotFoundException e) {

    System.out.println("sorry it didn't work out");

} catch(IOException f) {

    System.out.println("sorry it didn't work out");

}

Answer 1

你错过了什么，finally街区。在try-with-resouces将使它像，FileOutputStream outStream = null;try {&nbsp; outStream = new FileOutputStream("people.bin");&nbsp; ObjectOutputStream stream = new ObjectOutputStream(outStream);&nbsp; stream.writeObject(jar);&nbsp; stream.writeObject(can);&nbsp; stream.close();} catch(FileNotFoundException e) {&nbsp; &nbsp; System.out.println("sorry it didn't work out");} catch(IOException f) {&nbsp; &nbsp; System.out.println("sorry it didn't work out");} finally {&nbsp; if (outStream != null) {&nbsp;&nbsp; &nbsp; try {&nbsp;&nbsp; &nbsp; &nbsp; outStream.close();&nbsp;&nbsp; &nbsp; } catch (Exception e) {&nbsp; &nbsp; }&nbsp;&nbsp; }}这意味着您确实想要这样的东西（永远不要吞下异常），try (FileOutputStream outStream = new FileOutputStream("people.bin");&nbsp; &nbsp; &nbsp;ObjectOutputStream stream = new ObjectOutputStream(outStream);) {&nbsp; stream.writeObject(jar);&nbsp; stream.writeObject(can);&nbsp; // stream.close(); // <-- closed by try-with-resources.} catch(FileNotFoundException e) {&nbsp; &nbsp; System.out.println("sorry it didn't work out");&nbsp; &nbsp; e.printStackTrace();} catch(IOException f) {&nbsp; &nbsp; System.out.println("sorry it didn't work out");&nbsp; &nbsp; e.printStackTrace();}