Inheritance

• Implemented by

  extends keyword

Types of Inheritance in Java

• Single Inheritance
• Multilevel Inheritance
• Hierarchical Inheritance
• Hybrid Inheritance

Multiple Inheritance not allowed

Inheritance in case of default

• Are fields and methods with default access inherited?

  Only if the subclass is located in the same package as the superclass.

• How is multiple inheritance handled in case of methods with default access?

  In case both parent interfaces have a default method with same method signature, the implementing class should explicitly tell which one its trying to use or it should override the default method.

  //If I1 and I2 both have a fun() as default method
  class C implements I1, I2{
  I1.super.fun(); //Use I1's fun() method
  }
  

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Backlinks

• Principles (cs)