String Class & String manipulation in Java Part-3( Simple Examples for startsWith(),lastIndexOf(),replace(),replaceAll(),replaceFirst(),split() ,hashCode() Methods)

Hi All,

Here I wrote the program for String Class & String manipulation in java using simple examples :)

/* 

startsWith() Method

lastIndexOf() Method

replace() Method 

replaceAll() Method 

replaceFirst() Method 

split() Method 

hashCode() Method

*/

 

import java.lang.String.*;

import java.io.*;

public class stringOperations3 {

    public static void main(String args[]){

       /*String Manipuldation Part-3*/

        

        /* String lastIndexOf() Method

         *  

         * Note:

            1. int lastIndexOf(int ch): Returns the index within this string of the last occurrence of the specified character or -1 if the character does not occur.

            2. public int lastIndexOf(int ch, int fromIndex): Returns the index of the last occurrence of the character in the character sequence represented by this

               object that is less than or equal to fromIndex, or -1 if the character does not occur before that point.

            3. public int lastIndexOf(String str): If the string argument occurs one or more times as a substring within this object,

               then it returns the index of the first character of the last such substring is returned. If it does not occur as a substring, -1 is returned.

            4. public int lastIndexOf(String str, int fromIndex): Returns the index within this string of the last occurrence of the specified substring,

               searching backward starting at the specified index.

         */

        String name="SKI Technology in Technopark";

        String cName="no";

        System.out.println("Result of lastIndexOf(int ch) Method :"+name.lastIndexOf('T'));

        System.out.println("Result of lastIndexOf(int ch, int fromIndex) Method :"+name.lastIndexOf('T',4));

        System.out.println("Result of lastIndexOf(String str) Method :"+name.lastIndexOf(cName));

        System.out.println("Result of astIndexOf(String str, int fromIndex)Method :"+name.lastIndexOf(cName,15));

       

        

        /* replace() Method

         *

         * Note: It returns a string derived from this string by replacing every occurrence of oldChar with newChar.

         */

        String val=new String("My Name is skitech");       

        System.out.println("Result of the replace() Method :"+val.replace('s', 'k'));

        System.out.println("Result of the replace() Method :"+val.replace('k', 's'));

        

        /*replaceAll() Method

         *

         * Note: This method replaces each substring of this string that matches the given regular expression with the given replacement.

         */

        String cname="SkiTECH is fantastic";

        System.out.println("Result of the replaceAll() Method :"+cname.replaceAll("SkiTECH","Salem"));

        System.out.println("Result of the replaceAll() Method :"+cname.replaceAll("(.*)is(.*)","Salem"));

        

        /* replaceFirst() Method

         *

         * Note: This method replaces the first substring of this string that matches the given regular expression with the given replacement.

         */

        String cname1="my company name is Skitech in chennai company";

        System.out.println("Result of the replaceFirst() Method :"+cname1.replaceFirst(cname1,"bala"));

        System.out.println("Result of the replaceFirst() Method1 :"+cname1.replaceFirst("company","COMPANY"));

        System.out.println("Result of the replaceFirst() Method2 :"+cname1.replaceFirst("(.*)company(.*)","Skitech"));

        

        /* split() Method

         *

         * Note: It returns the array of strings computed by splitting this string around matches of the given regular expression.

         */

        System.out.println("Result of split() Method");

        String Str = new String("Welcome=to=SKITECH=blog");        

        for (String res: Str.split("="))

            System.out.println(res);

        

        System.out.println("Result of split() Method1");

        for(String res1:Str.split("=", 3))

             System.out.println(res1);

        

        System.out.println("Result of split() Method2");

        for(String res2:Str.split("=", 2))

             System.out.println(res2);

                   

        /*  startsWith() Method

         *

         * Note: It returns true if the character sequence represented by the argument is a prefix of the character sequence represented by this string; false otherwise.

         */

        String temp1="welcome to the SKiTECH";

        System.out.println("Result of startsWith() Method "+temp1.startsWith("welcome"));

        System.out.println("Result of startsWith() Method1 "+temp1.startsWith("to"));

        System.out.println("Result of startsWith() Method2 "+temp1.startsWith("the",11));

        

        /* hashCode() Method

         *

         * Note: This method returns a hash code value for this object.           

         */

        String str1="Ski technology in technopark";       

        System.out.println("Result of hashCode() Method "+str1.hashCode());

    }

    

}

 OUTPUT:

Result of lastIndexOf(int ch) Method :18
Result of lastIndexOf(int ch, int fromIndex) Method :4
Result of lastIndexOf(String str) Method :22
Result of astIndexOf(String str, int fromIndex)Method :8
Result of the replace() Method :My Name ik kkitech
Result of the replace() Method :My Name is ssitech
Result of the replaceAll() Method :Salem is fantastic
Result of the replaceAll() Method :Salem
Result of the replaceFirst() Method :bala
Result of the replaceFirst() Method1 :my COMPANY name is Skitech in chennai company
Result of the replaceFirst() Method2 :Skitech
Result of split() Method
Welcome
to
SKITECH
blog
Result of split() Method1
Welcome
to
SKITECH=blog
Result of split() Method2
Welcome
to=SKITECH=blog
Result of startsWith() Method true
Result of startsWith() Method1 false
Result of startsWith() Method2 true
Result of hashCode() Method 1464026455