Difference between Interface and Abstract class

Interface:

• Contains only abstract methods and the default access specifier is public. If we are specifying the method as shown in below.

                          void show();

       Internally it adds public abstract in front of the method.

                  i.e.,  public abstract void show();

• Contains only final methods.

                  i.e.,  public static final int a;

• Supports multiple Inheritance.
• Inheritance is possible only with extends keyword.

Abstract class:

• Contains abstract and concrete methods.
• Can have final and non final methods.
• Supports single inheritance only.
• Supports extends and implements keywords.