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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 import java.lang.reflect.Constructor;
     18 
     19 import java.lang.reflect.Constructor;
     20 
     21 /**
     22  * Test instance creation.
     23  */
     24 public class Main {
     25     public static void main(String[] args) {
     26         testClassNewInstance();
     27         testConstructorNewInstance();
     28     }
     29 
     30     /**
     31      * Tests Class.newInstance().
     32      */
     33     static void testClassNewInstance() {
     34         // should succeed
     35         try {
     36             Class c = Class.forName("LocalClass");
     37             Object obj = c.newInstance();
     38             System.out.println("LocalClass succeeded");
     39         } catch (Exception ex) {
     40             System.err.println("LocalClass failed");
     41             ex.printStackTrace();
     42         }
     43 
     44         // should fail
     45         try {
     46             Class c = Class.forName("otherpackage.PackageAccess");
     47             Object obj = c.newInstance();
     48             System.err.println("ERROR: PackageAccess succeeded unexpectedly");
     49         } catch (IllegalAccessException iae) {
     50             System.out.println("Got expected PackageAccess complaint");
     51         } catch (Exception ex) {
     52             System.err.println("Got unexpected PackageAccess failure");
     53             ex.printStackTrace();
     54         }
     55 
     56         LocalClass3.main();
     57 
     58         try {
     59             MaybeAbstract ma = new MaybeAbstract();
     60             System.err.println("ERROR: MaybeAbstract succeeded unexpectedly");
     61         } catch (InstantiationError ie) {
     62             System.out.println("Got expected InstantationError");
     63         } catch (Exception ex) {
     64             System.err.println("Got unexpected MaybeAbstract failure");
     65         }
     66     }
     67 
     68     /**
     69      * Tests Constructor.newInstance().
     70      */
     71     static void testConstructorNewInstance() {
     72         // should fail -- getConstructor only returns public constructors
     73         try {
     74             Class c = Class.forName("LocalClass");
     75             Constructor cons = c.getConstructor(new Class[0] /*(Class[])null*/);
     76             System.err.println("Cons LocalClass succeeded unexpectedly");
     77         } catch (NoSuchMethodException nsme) {
     78             System.out.println("Cons LocalClass failed as expected");
     79         } catch (Exception ex) {
     80             System.err.println("Cons LocalClass failed strangely");
     81             ex.printStackTrace();
     82         }
     83 
     84         // should succeed
     85         try {
     86             Class c = Class.forName("LocalClass2");
     87             Constructor cons = c.getConstructor((Class[]) null);
     88             Object obj = cons.newInstance();
     89             System.out.println("Cons LocalClass2 succeeded");
     90         } catch (Exception ex) {
     91             System.err.println("Cons LocalClass2 failed");
     92             ex.printStackTrace();
     93         }
     94 
     95         // should fail
     96         try {
     97             Class c = Class.forName("otherpackage.PackageAccess");
     98             Constructor cons = c.getConstructor(new Class[0] /*(Class[])null*/);
     99             System.err.println("ERROR: Cons PackageAccess succeeded unexpectedly");
    100         } catch (NoSuchMethodException nsme) {
    101             System.out.println("Cons got expected PackageAccess complaint");
    102         } catch (Exception ex) {
    103             System.err.println("Cons got unexpected PackageAccess failure");
    104             ex.printStackTrace();
    105         }
    106 
    107         // should fail
    108         try {
    109             Class c = Class.forName("MaybeAbstract");
    110             Constructor cons = c.getConstructor(new Class[0] /*(Class[])null*/);
    111             Object obj = cons.newInstance();
    112             System.err.println("ERROR: Cons MaybeAbstract succeeded unexpectedly");
    113         } catch (InstantiationException ie) {
    114             // note InstantiationException vs. InstantiationError
    115             System.out.println("Cons got expected InstantationException");
    116         } catch (Exception ex) {
    117             System.err.println("Cons got unexpected MaybeAbstract failure");
    118             ex.printStackTrace();
    119         }
    120     }
    121 }
    122 
    123 class LocalClass {
    124     // this class has a default constructor with package visibility
    125 }
    126 
    127 class LocalClass2 {
    128     public LocalClass2() {}
    129 }
    130 
    131 
    132 class LocalClass3 {
    133     public static void main() {
    134         try {
    135             CC.newInstance();
    136             System.out.println("LocalClass3 succeeded");
    137         } catch (Exception ex) {
    138             System.err.println("Got unexpected LocalClass3 failure");
    139             ex.printStackTrace();
    140         }
    141     }
    142 
    143     static class CC {
    144         private CC() {}
    145 
    146         static Object newInstance() {
    147             try {
    148                 Class c = CC.class;
    149                 return c.newInstance();
    150             } catch (Exception ex) {
    151                 ex.printStackTrace();
    152                 return null;
    153             }
    154         }
    155     }
    156 }
    157