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Can the overriding method throw the super-type of the exception thrown by the overridden method in Java?
If the super-class method throws certain exception, the method in the sub-class should not throw its super type.
Example
In the following example the readFile() method of the super-class throws FileNotFoundException exception and, the readFile() method of the sub-class throws an IOException, which is the super type of the FileNotFoundException.
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;
abstract class Super {
public String readFile(String path)throws FileNotFoundException {
throw new FileNotFoundException();
}
}
public class ExceptionsExample extends Super {
@Override
public String readFile(String path)throws IOException {
//method body ......
}
}Compile time error
On compiling, the above program gives you the following output −
ExceptionsExample.java:13: error: readFile(String) in ExceptionsExample cannot override readFile(String) in Sup
public String readFile(String path)throws IOException {
^
overridden method does not throw IOException
1 error
Updated on: 15-Oct-2019
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