Program to demonstrate Java 7 new feature : Rethrowing exceptions
package com.hubberspot.java7;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.net.MalformedURLException;
public class RethrowingException {
public static void main(String[] args) {
try {
rethrow();
} catch(IOException e) {
System.out.println(e.getMessage());
}
}
// here mentioning precise rethrow instead of catch type throw
private static void rethrow()
throws FileNotFoundException , MalformedURLException {
try {
// FileReader Constructor throws FileNotFoundException
FileReader fileReader = new FileReader("C://file.txt");
// toURL method of File class throws MalformedURLException
File file = new File("C://file.txt");
file.toURL();
// Instead of catching it as IOException and throwing
// the same IOException in the throws clause above
// we can now catch any sub-class type and throw super-class
// type exception, mentioning what possibilities try block can
// throw in the throws clause mentioned above.
// Here the method try block throw two exceptions as
// FileNotFoundException and MalformedURLException
// we caught it in catch statement and rethrow it as
// IOException. Here compiler knows what exactly its been thrown
} catch (IOException e) {
throw e;
}
}
}
