Try () {} = = in Java try-with-resources resource Auto-release

A while ago saw a structure of exception handling, but always forget to send blog learning, today read and see this exception handling,

Try () {

}catch () {

}

Similar to this structure.

This structure is called try-with-resources. Automatic resource release.

This feature exists from the JDK1.7.

For example, the following code:

private static void Custombufferstreamcopy (file source, file target) {
InputStream FIS = null;
OutputStream fos = null;
try {
FIS = new FileInputStream (source);
FOS = new FileOutputStream (target);

byte[] buf = new byte[8192];

int i;
while ((i = Fis.read (BUF))! =-1) {
Fos.write (buf, 0, I);
}
}
catch (Exception e) {
E.printstacktrace ();
} finally {
Close (FIS);
Close (FOS);
}
}

private static void Close (Closeable closable) {
if (closable! = null) {
try {
Closable.close ();
} catch (IOException e) {
E.printstacktrace ();
}
}
}

The above code is very complex for exception handling,

For resources to close is also very cumbersome, then you can compare with the following:

private static void Custombufferstreamcopy (file source, file target) {
Try (inputstream fis = new FileInputStream (source);
OutputStream fos = new FileOutputStream (target)) {

byte[] buf = new byte[8192];

int i;
while ((i = Fis.read (BUF))! =-1) {
Fos.write (buf, 0, I);
}
}
catch (Exception e) {
E.printstacktrace ();
}
}

This code uses this Try-with-resources resource auto-release feature.

In Try () {

}catch () {

The resources are automatically closed after the end, and released. There is no need to write off manually.

Try () {} = = in Java try-with-resources resource Auto-release