it is used to deal with abstract data types .This is implemented for different data types. Generic interfaces are specified just like generic classes. For example :
// T and X is type parameter
interface Fruit <T, X>{
T name(T data );
X getTest(X data);
void getDetails(T data ,X test);
}
public class Program2
{
public static void main(String[] args) {
// Now I can instantiate that interface, but since we don't have default implementations for those methods, it'll need
// an implementation when we instantiate it:
Fruit<String, String> o1 = new Fruit<String,String>(){
public String name(String data) {
return data;
}
public String getTest(String data) {
return data;
}
public void getDetails(String data, String test) {
System.out.println(data + " is " + test );
}};
System.out.println(o1.name("Orange")); // Orange
System.out.println(o1.getTest("Great Test")); //Great Test
o1.getDetails("Orange", "sour"); // Orange is sour
}
}