Why Java does not support multiple Inheritance ?

Java does not support multiple Inheritance (unlike, C++)

• Reason : Deadly Diamond of Death

• The class diagram formed in this scenario is a diamond
• It's a no solution output, so the code gets locked
• Java support multiple implementations, but not multiple Inheritance.
• A class can implement many Interfaces, but can not extend more than one class.

• Example
  1. An abstract super class, with an abstract method in it.
  2. Now 2 concrete class extend this abstract super class, and provides the implementation of the abstract method in the super class.
  3. A 4th class which extends the above two concrete classes.
  
  So now by the principle of inheritance it inherits all the methods of the parent class, but we have a common method in the two concrete classes but with different implementations, so which implementation will be used for the last child class which inherits both these classes ?
  
  Actually, no one has got the answer to the above question, and so to avoid this sort of critical issue, Java banned multiple inheritance.

Example

// Top most abstract class

class AbstractSuperClass{
    abstract void do();

}

// 2 concrete sub classes which extend the above super class

class ConcreteOne extends AbstractSuperClass {
   void do(){
      System.out.println("I am going to test multiple Inheritance");
   }

}

class ConcreteTwo extends AbstractSuperClass {
   void do(){
     System.out.println("I will cause the Deadly Diamond of Death");
   }

}

// Last class which extends both of the above concrete classes

class DiamondEffect extends ConcreteOne, ConcreteTwo {
   //Some methods of this class

}