What must a class do to implement an interface

In Java, to implement an interface, a class must do the following:

1. Use the implements keyword: In the class declaration, use the implements keyword followed by the name of the interface that you want the class to implement.
   java

   public class MyClass implements MyInterface {
// class body
}

2. Provide implementations for all interface methods: Any class that implements an interface must provide concrete implementations for all the methods declared in that interface. If a class fails to provide implementations for all the methods, it must be declared as abstract.
   java

   public class MyClass implements MyInterface {
   @Override
   public void method1() {
   // implementation
   }

   @Override
public int method2() {
// implementation
return 0;
}
}


3. Abide by the method signatures defined in the interface: The methods in the implementing class must have the exact same method signatures (name, return type, and parameters) as those declared in the interface.

By following these steps, a class effectively “implements” the interface, which means it provides concrete definitions for all the methods declared in that interface.