devxlogo

Creating an Object When its Class Is Unknown Before Runtime

Creating an Object When its Class Is Unknown Before Runtime

If you are writing an application in which you don’t know the class of an object until runtime, then you cannot use the new operator to instantiate the object. This is because new does not take the name of class file as a parameter. In this situation, you have to use the newInstance method of class Class. The code snippet given below demonstrates the technique:

 Object object = null;try{ Class classDefinition = Class.forName(className); object = classDefinition.newInstance();}catch (InstantiationException e) {          System.out.println(e);      }catch (IllegalAccessException e) {          System.out.println(e);      }catch (ClassNotFoundException e) {          System.out.println(e);      }return object;


Here, className is the fully qualified name of the desired class. For example: java.lang.Thread.

See also  5 Ways to Improve Customer Experience
devxblackblue

About Our Editorial Process

At DevX, we’re dedicated to tech entrepreneurship. Our team closely follows industry shifts, new products, AI breakthroughs, technology trends, and funding announcements. Articles undergo thorough editing to ensure accuracy and clarity, reflecting DevX’s style and supporting entrepreneurs in the tech sphere.

See our full editorial policy.

About Our Journalist