65 lines
1.9 KiB
Java
65 lines
1.9 KiB
Java
// exceptions/TurnOffChecking.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// "Turning off" Checked exceptions
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import java.io.*;
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class WrapCheckedException {
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void throwRuntimeException(int type) {
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try {
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switch(type) {
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case 0: throw new FileNotFoundException();
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case 1: throw new IOException();
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case 2: throw new
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RuntimeException("Where am I?");
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default: return;
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}
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} catch(IOException | RuntimeException e) {
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// Adapt to unchecked:
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throw new RuntimeException(e);
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}
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}
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}
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class SomeOtherException extends Exception {}
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public class TurnOffChecking {
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public static void main(String[] args) {
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WrapCheckedException wce =
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new WrapCheckedException();
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// You can call throwRuntimeException() without
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// a try block, and let RuntimeExceptions
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// leave the method:
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wce.throwRuntimeException(3);
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// Or you can choose to catch exceptions:
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for(int i = 0; i < 4; i++)
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try {
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if(i < 3)
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wce.throwRuntimeException(i);
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else
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throw new SomeOtherException();
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} catch(SomeOtherException e) {
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System.out.println(
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"SomeOtherException: " + e);
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} catch(RuntimeException re) {
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try {
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throw re.getCause();
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} catch(FileNotFoundException e) {
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System.out.println(
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"FileNotFoundException: " + e);
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} catch(IOException e) {
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System.out.println("IOException: " + e);
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} catch(Throwable e) {
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System.out.println("Throwable: " + e);
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}
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}
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}
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}
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/* Output:
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FileNotFoundException: java.io.FileNotFoundException
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IOException: java.io.IOException
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Throwable: java.lang.RuntimeException: Where am I?
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SomeOtherException: SomeOtherException
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*/
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