java类加载器

package vmrun;

import java.io.InputStream;

public class ClassLoadTest {
	public static void main(String [] args) throws Exception{
		ClassLoader myLoader = 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 (Exception e) {
					throw new ClassNotFoundException(name);
				}
			}
			
		};
		
		Object object= myLoader.loadClass("vmrun.InvokeDynamicTest").newInstance();
		System.out.println(object.getClass()) ;
		System.out.println(object instanceof vmrun.InvokeDynamicTest);
	}
}