TypeA.class位于classpath下, abso

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
public class Tester{
public static void main(String[] args){
   MyClassLoader cl1=new MyClassLoader();
   try{
    File f=new File("/absolute_path/TypeA.class");
    byte[] b=new byte[1024];
    InputStream is=new FileInputStream(f);
    int I=is.read(b);
    Class c=cl1.defineMyClass(null,b,0,1);
    TypeA a=(TypeA)c.newInstance();
   }catch(Exception e){
    e.printStacktrace();
   }
  }
}