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#import "/template.typ": *
#show: A => apply(A)
#set raw(lang: "java-new")
#set par(leading: 0.5em)
#assignment(20, block: true)[
Write a program in which create two interfaces, each with two methods, inherit a new interface from the two, adding a new method, create a class by implementing the new interface and also inheriting a concrete class. In the `main()` method, create an object of the derived class and call these methods.
]
#scos("InterfaceExample")
=== Discussion
#skind[Interfaces, classes and methods implemented in the program]
- Interface `Interface1`:
- `void method1()`: Declares a method.
- `void method2()`: Declares another method.
- Interface `Interface2`:
- `void method3()`: Declares a method.
- `void method4()`: Declares another method.
- Interface `NewInterface` (extends `Interface1` and `Interface2`):
- Inherits methods from `Interface1` and `Interface2`.
- `void newMethod()`: Declares a new method.
- Class `ConcreteClass`:
- Method `void concreteMethod()`: Declares a method.
- Class `DerivedClass` (extends `ConcreteClass` and implements `NewInterface`):
- Implements methods from `Interface1`, `Interface2`, and `NewInterface`.
- Method `void concreteMethod()`: Inherits and overrides a method.
- Class `InterfaceExample`:
- `public static void main(String[])`: Contains the main program, creating an instance of `DerivedClass` and calling various methods.
#signature()
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