!7

set flag AllPublic.

!include once #1019934 // BCEL

import org.apache.bcel.Const;
import org.apache.bcel.generic.*;

p {
  ClassGen cg = new("User123", "java.lang.Object", null,
    Const.ACC_PUBLIC, new S[] { className(IF0) });
    
  cg.addEmptyConstructor(Const.ACC_PUBLIC);
  
  // make code for get() method
  
  new InstructionList il;
  ConstantPoolGen cp = cg.getConstantPool();
  var factory = new InstructionFactory(cg);
  
  var mg = new MethodGen(Const.ACC_PUBLIC,
    new ObjectType(className(S)),
    new org.apache.bcel.generic.Type[] {}, null, "get", cg.getClassName(), il, cp);
    
  il.append(new PUSH(cp, "Hello world"));
  il.append(InstructionConst.ARETURN);

  mg.stripAttributes(true);
  mg.setMaxStack();
  mg.setMaxLocals();
  cg.addMethod(mg.getMethod());
  
  byte[] bytes = cg.getJavaClass().getBytes();
  var cl = new InMemoryClassLoader(myClassLoader());
  Class<? extends IF0> c = cast cl.defineAClass("User123", bytes);
  print(c);
  
  IF0 f = newInstance(c);
  print(f);
  print(value := f!);
}