Java example source code file (UnsafeAllocatorInstantiationTest.java)

This example Java source code file (UnsafeAllocatorInstantiationTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractclass, concreteclass, exception, interface, testcase, unsafeallocator, unsafeallocatorinstantiationtest

The UnsafeAllocatorInstantiationTest.java Java example source code

/*
 * Copyright (C) 2016 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.gson.internal;

import junit.framework.TestCase;

/**
 * Test unsafe allocator instantiation
 * @author Ugljesa Jovanovic
 */
public final class UnsafeAllocatorInstantiationTest extends TestCase {

  public interface Interface {
  }

  public static abstract class AbstractClass {
  }

  public static class ConcreteClass {
  }

  /**
   * Ensure that the {@link java.lang.UnsupportedOperationException} is thrown when  trying
   * to instantiate an interface
   */
  public void testInterfaceInstantiation() {
    UnsafeAllocator unsafeAllocator = UnsafeAllocator.create();
    try {
      unsafeAllocator.newInstance(Interface.class);
      fail();
    } catch (Exception e) {
      assertEquals(e.getClass(), UnsupportedOperationException.class);
    }
  }

  /**
   * Ensure that the {@link java.lang.UnsupportedOperationException} is thrown when  trying
   * to instantiate an abstract class
   */
  public void testAbstractClassInstantiation() {
    UnsafeAllocator unsafeAllocator = UnsafeAllocator.create();
    try {
      unsafeAllocator.newInstance(AbstractClass.class);
      fail();
    } catch (Exception e) {
      assertEquals(e.getClass(), UnsupportedOperationException.class);
    }
  }

  /**
   * Ensure that no exception is thrown when trying to instantiate a concrete class
   */
  public void testConcreteClassInstantiation() {
    UnsafeAllocator unsafeAllocator = UnsafeAllocator.create();
    try {
      unsafeAllocator.newInstance(ConcreteClass.class);
    } catch (Exception e) {
      fail();
    }
  }
}