Difference between Interface and Abstract class

Interface	Abstract Class
1. Use interface when we have specification but don’t have any idea about implementation	1.Use it when we have partial information about implementation
2. Abstract methods only. From java 8 default and static methods also	2. have both abstract and non-abstract methods
3. Every variable is public , static and final
4. No constructors allowed , no instance and stat
5. Can extend another interface only	Multiple inheritance allowed
6. Method is public

 

• A Java class can implement multiple interfaces but it can extend only one abstract class.