class to java - Wikitechy https://www.wikitechy.com/interview-questions/tag/class-to-java/ Interview Questions Sat, 30 Apr 2022 10:09:11 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png class to java - Wikitechy https://www.wikitechy.com/interview-questions/tag/class-to-java/ 32 32 Difference between ClassNotFoundException and NoClassDefFoundError in java ? https://www.wikitechy.com/interview-questions/java/difference-between-classnotfoundexception-and-noclassdeffounderror-in-java/ https://www.wikitechy.com/interview-questions/java/difference-between-classnotfoundexception-and-noclassdeffounderror-in-java/#respond Wed, 14 Jul 2021 00:03:41 +0000 https://www.wikitechy.com/interview-questions/?p=670

Difference between ClassNotFoundException and NoClassDefFoundError in java ?

  • ClassNotFoundException and NoClassDefFoundError occur when a particular class is not found at runtime. However, they occur at different scenarios.
  • ClassNotFoundException is an exception that occurs when you try to load a class at run time using Class.forName() or loadClass() methods and mentioned classes are not found in the classpath.
  • NoClassDefFoundError is an error that occurs when a particular class is present at compile time, but was missing at run time.
NoClassDefFoundError ClassNotFoundException
NoClassDefFoundError is an error. It is the type of
java.lang.Error.		 ClassNotFoundException is an exception. It is the type of java.lang.Exception.
It occurs when java runtime system doesn’t
find a class definition, which is present at compile time,
but missing at run time.		 It occurs when an application tries to load a class at run time which is not updated in the classpath.
It is thrown by the Java Runtime System. It is thrown by the application itself. It is thrown by the methods like Class.forName(), loadClass() and findSystemClass().
It occurs when required class definition is missing
at runtime.		 It occurs when classpath is not updated wih required JAR files.

]]> https://www.wikitechy.com/interview-questions/java/difference-between-classnotfoundexception-and-noclassdeffounderror-in-java/feed/ 0 What is class/object diagram ? https://www.wikitechy.com/interview-questions/java/what-is-class-object-diagram/ https://www.wikitechy.com/interview-questions/java/what-is-class-object-diagram/#respond Tue, 13 Jul 2021 23:06:29 +0000 https://www.wikitechy.com/interview-questions/?p=614

What is class/object diagram ?

Java Class:

  • A class is an entity that determines how an object will perform and what the object will contain.
  • In other words, it is a blueprint or a set of instruction to build a specific type of object.
Class and Object Diagram

Syntax:

class ClassName {
   // variables
   // methods
}

Java Objects:

  • When class is defined, only the condition for the object is defined.
  • No memory or storage is allocated.
  • To access members defined within the class, you need to create objects.

Syntax:

ClassName ReferenceVariable = new ClassName();
]]> https://www.wikitechy.com/interview-questions/java/what-is-class-object-diagram/feed/ 0