java:exception

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--- java:exception [2014/01/22 13:06]
kwon37xi [Checked Exception]
+++ java:exception [2021/07/14 12:49] (현재)
kwon37xi
@@ 줄 1: / 줄 1: @@
 ====== Java Exception ======
+  * [[http://www.tutorialspoint.com/java/java_builtin_exceptions.htm|Java - Built-in Exceptions]]
+  * [[java:problem|problem]]
 ===== Checked Exception =====
 가능하면 사용하지 말 것.
-  * [[http://java.dzone.com/articles/throwing-undeclared-checked|Throwing Undeclared Checked Exceptions | Javalobby]]<code java>
+  * [[http://java.dzone.com/articles/throwing-undeclared-checked|Throwing Undeclared Checked Exceptions | Javalobby]]
-class Thrower {
+  * [[http://www.gamlor.info/wordpress/?p=1020|Throwing Checked Exceptions Like Unchecked Exceptions in Java |Checked Exception을 RuntimeException 처럼 던지는 방법]]<code java>
-    public static void spit(final Throwable exception) {
+public class ExceptionThrower {
-        class EvilThrower<T extends Throwable> {
+    private ExceptionThrower() {}
-            @SuppressWarnings("unchecked")
-            private void sneakyThrow(Throwable exception) throws T {
+    public static void spit(final Throwable throwable) {
-                throw (T) exception;
+        // 아래 <RuntimeException> 타입 정보는 컴파일 상태에서는 지워진다.
-            }
+        ExceptionThrower.<RuntimeException>throwWithoutCheck(throwable);
-        }
-        new EvilThrower<RuntimeException>().sneakyThrow(exception);
     }
-}
-public class ThrowerSample {
+    @SuppressWarnings("unchecked")
-    public static void main( String[] args ) {
+    private static <T extends Throwable> void throwWithoutCheck(Throwable throwable) throws T {
-        Thrower.spit(new RemoteException("go unchecked!"));
+        // 아래 Type Casting 정보는 Java Generic의 특성상 컴파일시 정보가 사라지므로
+        // 실제 캐스팅은 발생하지 않는다.
+        throw (T) throwable;
     }
 }
-</code>
-  * [[http://www.gamlor.info/wordpress/?p=1020|Throwing Checked Exceptions Like Unchecked Exceptions in Java | Gamlor]]<code java>
-public final class UncheckedThrow {
-    private UncheckedThrow(){}
-    public static void throwUnchecked(final Exception ex){
+ExceptionThrower.spit(new IOException("테스트 Checked 예외"));
-        // Now we use the 'generic' method. Normally the type T is inferred
-        // from the parameters. However you can specify the type also explicit!
-        // Now we du just that! We use the RuntimeException as type!
-        // That means the throwsUnchecked throws an unchecked exception!
-        // Since the types are erased, no type-information is there to prevent this!
-        UncheckedThrow.<RuntimeException>throwsUnchecked(ex);
-    }
-    /**
-     * Remember, Generics are erased in Java. So this basically throws an Exception. The real
-     * Type of T is lost during the compilation
-     */
-    public static <T extends Exception> void throwsUnchecked(Exception toThrow) throws T{
-        // Since the type is erased, this cast actually does nothing!!!
-        // we can throw any exception
-        throw (T) toThrow;
-    }
-}
 </code>

java/exception.1390363565.txt.gz · 마지막으로 수정됨: 2014/01/22 13:06 저자 kwon37xi