JAVA import statements

In JAVA there are three types of import statements

1.       Explicit import – import java.util.ArrayList;

v  It will imports only ArrayList class into our class

v  This is highly recommended in real time

                                    

2.       Implicit import – import  java.util.*;

v  It imports all the classes and interfaces presented in java.util package

v  This is not recommended in real time. It increases the burden on class loader as it imports unnecessary things

3.       Static import – import static java.lang.Math.*;

v        This was newly introduced in jdk1.5

v        This is for importing only static members in a class

 

Example:

                package pack2;

import static java.lang.Math.*; // static import

public class FirstProg {

              public static int i=10;

              static int j = 20;

              public static void main(String[] args) {

                     System.out.println(max(i,j));//max is a static method. we are not using class name for calling because we static imported

              }     

}

Important points: 

     Order of statements in a class

                     Package statement should