Import Statement || Java OOps

Import Statements

1. Length of the code is Reduced.

2. import Statement is used once.

3.Advantage is used for Shortnames.

Simple Program1:

class Test

{

public static void main(String []args)

{

ArrayList l = new ArrayList();// short names cannot be acceptable with import Statement

}

}

Output: Cannot Find Symbol(error)

                        Symbol: Class ArrayList

                        Class: Test

Solution:

Simple Program2:

class Test

{

public static void main(String []args)

{

java.util.ArrayList l = new java.util.ArrayList(); //Fully qualified name

java.util.ArrayList l = new java.util.ArrayList();

}

}

Output:

The program is executed

*Note: java.util.ArrayList   is  used for everytime ( if we use inside the body).

Simple Program3:

Import java.util.ArrayList; // there is no need to Fully qualified name.

class Test

{

public static void main(String []args)

{

ArrayList l = new ArrayList

}

}

Output: Import statement is executed

There are Two types of import Statements

1. Explicit import Statement

2. Implicit import Statement

1.   Explicit import Statement

·       Readablity of program is more.

·       Statement is used for evey class. (recommended mostly)

Import com.hdfc.ArrayList;

.

.

ArrayList l = new ArrayList

2.   implicit import Statement

·       Readablity of program is not good

·       Statement is used for evey class.

Import com.hdfc.*;

ArrayList l = new ArrayList // package not find and matched  class