Creating a Java object from an external java file

Question

How to load a * .java class file into my java application and create an object based on this class file?

Answer 1

You can do this using classes inside javax.tools. You will have a class ToolProviderfrom which you can get the compiler instance and compile the code at runtime. Later, you will upload files .classsimply compiled separately with ClassLoader, unless you get the binary directly for this class, and you can link it directly.

Look here

Answer 2

Janino SimpleCompiler. , no-arg.

import org.codehaus.janino.SimpleCompiler;

public class JaninoSimpleTest
{
  public static void main(String[] args) throws Throwable
  {
    String filename = args[0];
    String className = args[1];
    SimpleCompiler compiler = new SimpleCompiler(filename);
    ClassLoader loader = compiler.getClassLoader();
    Class compClass = loader.loadClass(className);
    Object instance = compClass.newInstance();
  }
}

Answer 3

i think it helps: Package Summary Or Simple Compiler .

Answer 4

You can not. The .java file needs to be compiled into .class so you can use it.