ClassLoader

public class ClassLoaderTest {
	public static void main(String[] args) throws InstantiationException, IllegalAccessException, ClassNotFoundException {
		ClassLoader loader = new ClassLoader() {
			@Override
			public Class<?> loadClass(String name) throws ClassNotFoundException {
				try {
					String fileName = name.substring(name.lastIndexOf(".") + 1) + ".class";
					InputStream is = getClass().getResourceAsStream(fileName);
					if (is == null) {
						return super.loadClass(name);
					}
					byte[] b=new byte[is.available()];
					is.read(b);
					return defineClass(name, b, 0, b.length);
				} catch (IOException e) {
					throw new ClassNotFoundException();
				}

			}
		};
		String className="com.ClassLoaderTest.ClassLoaderTest";
		Object obj1=ClassLoaderTest.class.getClassLoader().loadClass(className).newInstance();
		//System.out.println(obj1.getClass().getClassLoader()+"~~~~~~~~~~");
		System.out.println(obj1 instanceof com.ClassLoaderTest.ClassLoaderTest);
		Object obj2=loader.loadClass(className).newInstance();
		//System.out.println(obj2.getClass().getClassLoader());
		System.out.println(obj2 instanceof com.ClassLoaderTest.ClassLoaderTest);
		obj2.toString();
	}
}