// 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

*/