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Saturday, 8 October 2011

Vu & Web Designing walonnn***



From: Mohammad Sajjad <ghulamemastan@gmail.com>
Date: Sat, Oct 8, 2011 at 3:53 AM
Subject: ))))Vu & Company(((( ***Web Designing walooonn***
To: vu-and-company <vu-and-company@googlegroups.com>, dare-arqam-vu@googlegroups.com


Strings

 string is commonly considered to be a sequence of characters stored in memory and accessible as a unit.Strings in java are represented as objects.

 

String Concatenation

 

 

      "+" operator is used to concatenate strings

–    System.out.pritln("Hello" + "World") will print Hello World on console

 

      String  concatenated  with  any  other  data  type  such  as  int  will  also  convert  that datatype toString and the result will be a concatenated String displayed on console. For example,

 

–    int i = 4;

–    int j = 5;

 

      System.out.println ("Hello" + i)

      will print  Hello 4  on screen

 

–    However

      System,.out..println( i+j)  ;

      will print 9 on the console because both i and j are of type int.

 

 

 Comparing Strings

 

For comparing Strings never use == operator, use equals method of String class.

 

–    == operator compares addresses (shallow comparison) while equals compares values (deepcomparison)

      E.g string1.equals(string2)

 

 

Example Code: String concatenation and comparison

 

public class StringTest {

  public static void main(String[] args) {

 

    int i = 4;

    int j = 5;

 

    System.out.println("Hello" + i); // will print Hello4

    System.out.println(i + j); // will print 9

 

    String s1 = new String ("pakistan");

    String s2 = "pakistan";

 

    if (s1 == s2) {

      System.out.println("comparing string using == operator");

 

    }

 

   if (s1.equals( s2) ) {

    System.out.println("comparing string using equal method");

  }

 }

}

 

 

On execution of the above program, following output will produce

 

 

 


--


Tere wajood se hai gulistan ki ronkain sari, 'MAA'
K Tere bgair is duniya ko hm Veeran likhty hain


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