How to properly deal with java interface in different package? -

i'm new java , i've got package interfaces. each interface has number of imports types used in interface declarations.

// myinterface.java...  package a.b.c.interfaces;  import java.math.bigdecimal; import java.util.list; import java.util.set;  public interface myinterface() { ... 

then i've got package models, , inside of it, i'm attempting create class implements myinterface().

// myimplementation.java...  package a.b.c.models;  public class myimplementation implements myinterface {... 

i have 2 questions:

1. does myinterface() need imported myimplementation()? if not, need linked manually during compilation?
2. if myinterface() imported, necessary import types interface requires, or import of myinterface.java take care of this?

imports in java way of telling compiler when write myinterface mean a.b.c.interfaces.myinterface. possible write java code without using imports extremely verbose , looks messy.

you need import type want use not in same package class you're writing or in java.lang since myinterface in a.b.c.interfaces , myimplementation in a.b.c.model need import it.

you need import classes myinterface using if you're writing type anywhere in code - , since you're implementing interface need write types in method declarations. there no way of using same imports class in java.

here example of usage of types don't need import them:

usesbiginteger.java:

import java.math.biginteger;  public class usesbiginteger {     public biginteger get() {         return biginteger.ten;     } } 

main.java

public class main {      public static void main(string[] args) {           usesbiginteger use = new usesbiginteger();           system.out.println(use.get());      } } 

the reason don't have import java.math.biginteger here never write biginteger anywhere don't need tell compiler mean - pass return value usesbiginteger.get() along , compiler knows that java.math.biginteger.

if want keep reference biginteger need import though:

main.java

import java.math.biginteger;  public class main {      public static void main(string[] args) {           usesbiginteger use = new usesbiginteger();           biginteger = use.get();           system.out.println(it);      } }