How to implement only the speciefied methods when using interface in java?

Question

how can change final data and methods in java?

Answer 1

public interface InterfaceA {       
    public void method1();
    void method2();
}


public abstract class ClassA implements InterfaceA  {
    public void method3() {
    }

    @Override
    public void method2() {
    }
}

your requirement helps when using abstract class