Avoid implementing methods in interfaces – Java

I have the following interface:

public interface a {
    public void m1();
    public void m2();
    public void m3();
}

public class A implements a {
    public void m3() {
        // implementation code     
    }
}

I want to avoid implementing the rest of the methods One way is not to implement all the methods in the class that is trying to implement the interface

How can I avoid this situation The sample code can help me better understand:)

Solution

public interface a{

public interface a{

      public void m1();
      public void m2();
      public void m3();

}

public abstract class A implements a{

       public void m3(){

           // implementation code     

           }

}

Declared as an abstract class, so you don't need to implement these methods in this class But you must implement these methods in specific classes