The best way to catch a number of Exceptions in a single catch block
One place the place I really feel catching a number of exceptions in a single catch block helps is Java database connectivity, Java IO, and formatting date in Java. Since most of JDBC code throws checked SQLException, IO-related code throws IOException, and date formatting throws ParseException, which might’t be dealt with in a single catch block previous to Java 7.
Although there may be an alternative choice to catch java.lang.Exception as an alternative of java.io.IOException and subsequently checked exceptions however that strategy is fragile as a result of it’ll additionally catch unintended exceptions.
Catching java.lang.Exception means your code is open for all form of exceptions, it is not thought-about pretty much as good apply. With a number of exception catch block in Java 7, you possibly can mix dealing with of those two exceptions at one place within the code.
Code earlier than Java 7
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.textual content.ParseException;
import java.textual content.SimpleDateFormat;
import java.util.Date;
/**
*
* Java program to catch a number of exception earlier than Java 7
*/
public class BeforeJava7{
public static void foremost(String args[]) {
attempt {
File file = new File(“take a look at.txt”);
FileInputStream fis = new FileInputStream(file);
BufferedReader bReader = new BufferedReader(new InputStreamReader(fis));
String str = bReader.readLine();
SimpleDateFormat format = new SimpleDateFormat(“DD/MM/YY”);
Date date = format.parse(str);
} catch (ParseException exception) {
//code to deal with ParseException
} catch (IOException exception) {
//code to deal with IOException
}
}
}
After Java 7, each of catch block will be changed with a easy a number of exception catch block, as proven under:
attempt{
//code
}catch(ParseException | IOException ex) {
// deal with ParseException and IOException right here.
}
Listed below are some extra vital options from Java 7 launch, you possibly can examine them right here:
Different Java 7 tutorials for Java programmer
