core java interview questions

• What is a local, member and a class variable?
   
  
   
• What modifiers are allowed for methods in an Interface?
   
  
   
• Why operator overloading is not there in java?
   
  
   
• What modifiers are allowed for methods in an Interface?
   
  
   
• What does it mean that a method or field is “staticâ€�?
   
  
   
• What are wrapped classes?
   
  
   
• What is a local, member and a class variable?
   
   
• What is transient variable?
   
  
   
• What do you understand by Synchronization?
   
  
   
• What is Collection API?
   
  
   
• What is similarities between an Abstract class and Interface?
   
  
   
• What is difference between an Abstract class and Interface?
   
  
   
• How to define an Abstract class?
   
  
   
• How to define an Interface?
   
  
   
• Explain the user defined Exceptions?
   
  
   
• Explain garbage collection?
   
  
   
• Describe the principles of OOPS.
   
  
   
• Explain the Encapsulation principle.
   
   
• Explain the Inheritance principle. 
   
• Explain the Polymorphism principle.