Creating an instance using the class name and calling constructor

by

Yes, something like:

Class<?> clazz = Class.forName(className);
Constructor<?> ctor = clazz.getConstructor(String.class);
Object object = ctor.newInstance(new Object[] { ctorArgument });

That will only work for a single string parameter of course, but you can modify it pretty easily.

Note that the class name has to be a fully-qualified one, i.e. including the namespace. For nested classes, you need to use a dollar (as that’s what the compiler uses). For example:

package foo;

public class Outer
{
    public static class Nested {}
}

To obtain the Class object for that, you’d need Class.forName("foo.Outer$Nested").

More Related Contents:

  1. How to create a generic array in Java?
  2. How to instantiate an Embeddable class?
  3. How do I programmatically compile and instantiate a Java class?
  4. Modify a class definition’s annotation string parameter at runtime
  5. Java Reflection Performance
  6. Is there a way to instantiate a class by name in Java?
  7. Can I obtain method parameter name using Java reflection?
  8. How to instantiate an inner class with reflection in Java?
  9. How do I read all classes from a Java package in the classpath?
  10. Printing all variables value from a class
  11. How to call a superclass method using Java reflection
  12. Invoking a static method using reflection
  13. Printing debug info on errors with java 8 lambda expressions
  14. What is the difference between a.getClass() and A.class in Java?
  15. Instantiating object of type parameter
  16. Method to dynamically load java class files
  17. Is it possible to create an instance of inner class using Java Reflection?
  18. How to get the Array Class for a given Class in Java?
  19. String replacement in java, similar to a velocity template
  20. Accessing Java static final variable value through reflection
  21. Dumping a java object’s properties
  22. Java Reflection: Getting fields and methods in declaration order
  23. Java Reflection: Why is it so slow?
  24. Find out which classes of a given API are used
  25. Disable Java reflection for the current thread
  26. What’s the best way to get a Class object for an array type?
  27. Java getMethod with subclass parameter
  28. Get value of a parameter of an annotation in Java
  29. Using jars that use java.beans classes (Introspector, BeanInfo or PropertyDescriptor)
  30. How to watch a variable for changes

Leave a Comment