Interface is
nothing but 100% abstract methods up to java 7 but Java 8 onwards we can use
void methods
1. Allowed Modifiers for Interface : public, abstract, default
2. Allowed Modifiers for Interface variables : public , static and final.
Marker Interface: Interfaces with no field or methods, in simple word we can say empty interface, is called Marker or Tag Interface. Marker interface is used as a tag to pass a message to java compiler so that it can add special behavior to the class that implementing it. Clonable and Serializable are example of Marker Interface.
1. Allowed Modifiers for Interface : public, abstract, default
2. Allowed Modifiers for Interface variables : public , static and final.
Marker Interface: Interfaces with no field or methods, in simple word we can say empty interface, is called Marker or Tag Interface. Marker interface is used as a tag to pass a message to java compiler so that it can add special behavior to the class that implementing it. Clonable and Serializable are example of Marker Interface.
Payment.java
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