// exceptions/TurnOffChecking.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// "Turning off" Checked exceptions
import java.io.*;

class WrapCheckedException {
 void throwRuntimeException(int type) {
 try {
 switch(type) {
 case 0: throw new FileNotFoundException();
 case 1: throw new IOException();
 case 2: throw new
 RuntimeException("Where am I?");
 default: return;
 }
 } catch(IOException | RuntimeException e) {
 // Adapt to unchecked:
 throw new RuntimeException(e);
 }
 }
}

class SomeOtherException extends Exception {}

public class TurnOffChecking {
 public static void main(String[] args) {
 WrapCheckedException wce =
 new WrapCheckedException();
 // You can call throwRuntimeException() without
 // a try block, and let RuntimeExceptions
 // leave the method:
 wce.throwRuntimeException(3);
 // Or you can choose to catch exceptions:
 for(int i = 0; i < 4; i++)
 try {
 if(i < 3)
 wce.throwRuntimeException(i);
 else
 throw new SomeOtherException();
 } catch(SomeOtherException e) {
 System.out.println(
 "SomeOtherException: " + e);
 } catch(RuntimeException re) {
 try {
 throw re.getCause();
 } catch(FileNotFoundException e) {
 System.out.println(
 "FileNotFoundException: " + e);
 } catch(IOException e) {
 System.out.println("IOException: " + e);
 } catch(Throwable e) {
 System.out.println("Throwable: " + e);
 }
 }
 }
}
/* Output:
FileNotFoundException: java.io.FileNotFoundException
IOException: java.io.IOException
Throwable: java.lang.RuntimeException: Where am I?
SomeOtherException: SomeOtherException
*/