java – Automation Fraternity Blog

Java program to check given String is palindrome or not

July 10, 2019 SnehalDJadhav 1 Comment

package string_manipulation;

import java.util.Scanner;

public class ReverseString {

public static void main(String[] args) {

Scanner scn=new Scanner(System.in);
System.out.println("Enter your string to check palindrome");
String s=scn.nextLine();
scn.close();

String []s1=s.split("");
String reverseString="";

for(int i=s1.length-1;i>=0;i--){

reverseString=reverseString+s1[i];

}
System.out.println(reverseString);

if(s.equals(reverseString)){

System.out.println("Given string is a palindrom");
}
else{
System.out.println("Given string is not a palindromen");
}
}

}

package string_manipulation;

import java.util.Scanner;

public class ReverseString {

public static void main(String[] args) {

Scanner scn=new Scanner(System.in);

System.out.println("Enter your string to check palindrome");

String s=scn.nextLine();

scn.close();

String []s1=s.split("");

String reverseString="";

for(int i=s1.length-1;i>=0;i--){

reverseString=reverseString+s1[i];

}

System.out.println(reverseString);

if(s.equals(reverseString)){

System.out.println("Given string is a palindrom");

}

else{

System.out.println("Given string is not a palindromen");

}

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Jave program to count repeated characters in given String

SnehalDJadhav

//Using Hashmap

package string_manipulation;

import java.util.HashMap;

public class CharCountInStringUsingHashMap {

public static void main(String[] args) {

//Creating a HashMap containing char as a key and occurrences as a value
String inputString="My name is Snehal Dasharsth Jadhav";
HashMap<Character, Integer> charCountMap = new HashMap<Character, Integer>();

//Converting given string to char array

char[] strArray = inputString.toCharArray();

//checking each char of strArray

for (char c : strArray)
{
if(charCountMap.containsKey(c))
{
//If char is present in charCountMap, incrementing it's count by 1

charCountMap.put(c, charCountMap.get(c)+1);
}
else
{
//If char is not present in charCountMap,
//putting this char to charCountMap with 1 as it's value

charCountMap.put(c, 1);
}
}

//Printing the charCountMap

System.out.println(charCountMap);
}

}





//Using for loop

package string_manipulation;

public class charCountInString {

public static void main(String[] args) {

String s=new String("My name is snehal dasharath jadhav ");

char []a=s.toCharArray();

for(int i=0;i<a.length;i++){

int count=1;
for(int j=i+1;j<a.length;j++)
{

if(a[i]==a[j])
{

count++;
a[j]= '0';
}
}

if(count>1 && a[i]!='0'){
//System.out.println(a[i]);
System.out.println("number of times repeated "+a[i]+" is "+count);
}
}

}}

//Using Hashmap

package string_manipulation;

import java.util.HashMap;

public class CharCountInStringUsingHashMap {

public static void main(String[] args) {

//Creating a HashMap containing char as a key and occurrences as a value

String inputString="My name is Snehal Dasharsth Jadhav";

HashMap<Character, Integer> charCountMap = new HashMap<Character, Integer>();

//Converting given string to char array

char[] strArray = inputString.toCharArray();

//checking each char of strArray

for (char c : strArray)

{

if(charCountMap.containsKey(c))

{

//If char is present in charCountMap, incrementing it's count by 1

charCountMap.put(c, charCountMap.get(c)+1);

}

else

{

//If char is not present in charCountMap,

//putting this char to charCountMap with 1 as it's value

charCountMap.put(c, 1);

}

//Printing the charCountMap

System.out.println(charCountMap);

}

//Using for loop

package string_manipulation;

public class charCountInString {

public static void main(String[] args) {

String s=new String("My name is snehal dasharath jadhav ");

char []a=s.toCharArray();

for(int i=0;i<a.length;i++){

int count=1;

for(int j=i+1;j<a.length;j++)

{

if(a[i]==a[j])

{

count++;

a[j]= '0';

}

if(count>1 && a[i]!='0'){

//System.out.println(a[i]);

System.out.println("number of times repeated "+a[i]+" is "+count);

}

}}

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Java: Methods of String class

SnehalDJadhav 2 Comments

package string_manipulation;

public class StringMethods {

public static void main(String[] args) {
String s=" hello Friends ";

String s2 = s.concat("my name is abc");

System.out.println(s);

s=s.concat("my name is abc");

System.out.println(s);

//equals method check the content of string so it will return boolean value
if(s.equals(s2))
{
System.out.println("both are same");
}
else{
System.out.println("different in equals");
}

//It will check address of giver reference variable &return boolean value
if(s==s2){
System.out.println("Pointing to same address");
}
else{
System.out.println("pointing to different address");
}

//It will give the length of string
System.out.println(s.length());

//It will return the character of 4th index
System.out.println(s.charAt(4));

//To remove whitespaces from starting and ending of perticular string
System.out.println(s.trim());

//to check string is empty or not it will return boolean value
System.out.println(s.isEmpty());

// It will replace character 'e' with 's'
System.out.println(s.replace("e", "S"));

//return the address of the string object
System.out.println(s.hashCode());

//Convert the given string into upperCase
System.out.println(s.toUpperCase());

// split() will convert string into string array
String[] a = s.split("");
}

}

package string_manipulation;

public class StringMethods {

public static void main(String[] args) {

String s=" hello Friends ";

String s2 = s.concat("my name is abc");

System.out.println(s);

s=s.concat("my name is abc");

System.out.println(s);

//equals method check the content of string so it will return boolean value

if(s.equals(s2))

{

System.out.println("both are same");

}

else{

System.out.println("different in equals");

}

//It will check address of giver reference variable &return boolean value

if(s==s2){

System.out.println("Pointing to same address");

}

else{

System.out.println("pointing to different address");

}

//It will give the length of string

System.out.println(s.length());

//It will return the character of 4th index

System.out.println(s.charAt(4));

//To remove whitespaces from starting and ending of perticular string

System.out.println(s.trim());

//to check string is empty or not it will return boolean value

System.out.println(s.isEmpty());

// It will replace character 'e' with 's'

System.out.println(s.replace("e", "S"));

//return the address of the string object

System.out.println(s.hashCode());

//Convert the given string into upperCase

System.out.println(s.toUpperCase());

// split() will convert string into string array

String[] a = s.split("");

}

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Java8 features(Lambda Expression and Stream API)

July 9, 2019 Bindiya Patil 2 Comments

/****author: Bindiya Patil****/

/****forEach()method****/

package program;

import java.util.ArrayList;
import java.util.List;

public class ForEachmethod {

public static void main(String[] args) {
List<String> fruits = new ArrayList<String>();
fruits.add("Apple");
fruits.add("Orange");
fruits.add("Banana");
fruits.add("Pear");
fruits.add("Mango");
//lambda expression in forEach Method
fruits.forEach(str->System.out.println(str));
}

}

/****functional interface***/

package program;

public interface functional_interface {

public int add(int a, int b);

}

/****Lambda Expression****/

package program;

public class lambda_expression {
public static void main(String[] args) {

functional_interface d2=(a,b)-> (a+b);

System.out.println(d2.add(10, 20));
}
}

/***Stream API*****/

package program;

import java.util.ArrayList;
import java.util.List;

public class Stream_API {
public static void main(String[] args) {
List<String> names = new ArrayList<String>();
names.add("Ajeet");
names.add("Negan");
names.add("Aditya");
names.add("Steve");

//Using Stream and Lambda expression
long count = names.stream().filter(str->str.length()<6).count();
System.out.println("There are "+count+" strings with length less than 6");
}

}

/****author: Bindiya Patil****/

/****forEach()method****/

package program;

import java.util.ArrayList;

import java.util.List;

public class ForEachmethod {

public static void main(String[] args) {

List<String> fruits = new ArrayList<String>();

fruits.add("Apple");

fruits.add("Orange");

fruits.add("Banana");

fruits.add("Pear");

fruits.add("Mango");

//lambda expression in forEach Method

fruits.forEach(str->System.out.println(str));

}

/****functional interface***/

package program;

public interface functional_interface {

public int add(int a, int b);

}

/****Lambda Expression****/

package program;

public class lambda_expression {

public static void main(String[] args) {

functional_interface d2=(a,b)-> (a+b);

System.out.println(d2.add(10, 20));

}

/***Stream API*****/

package program;

import java.util.ArrayList;

import java.util.List;

public class Stream_API {

public static void main(String[] args) {

List<String> names = new ArrayList<String>();

names.add("Ajeet");

names.add("Negan");

names.add("Aditya");

names.add("Steve");

//Using Stream and Lambda expression

long count = names.stream().filter(str->str.length()<6).count();

System.out.println("There are "+count+" strings with length less than 6");

}

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Java Fetch data and Save in Dual Hash Map Explained

December 30, 2018 admin

	@Override
	public HashMap<Integer, HashMap<Integer, String>> GetUITableText(WebElement _locator) {

		// TODO Auto-generated method stub
		
		List<WebElement> o_col_rows = _locator.findElements(By.tagName("tr"));
		int i_row_count = o_col_rows.size();
		List<WebElement> o_col_clms;
		int i_clm_count;
		String cell_text;
		//HashMap<Integer,HashMap<Integer,String>> o = new 
		
		HashMap<Integer, HashMap<Integer, String>> result_map= new HashMap<Integer,HashMap<Integer,String>>();
		HashMap<Integer, String> o_col_map=null;;
		
		for (int i=0;i<i_row_count;i++) {
			o_col_clms = o_col_rows.get(i).findElements(By.tagName("td"));
			i_clm_count = o_col_clms.size();
			for(int j=0;j<i_clm_count;j++) {
				cell_text = o_col_clms.get(j).getText();
				//System.out.println(cell_text);
				o_col_map.put(j, cell_text);
			}
			result_map.put(i, o_col_map);
		}
		return result_map;
		
		
		
	}//end method

@Override

public HashMap<Integer, HashMap<Integer, String>> GetUITableText(WebElement _locator) {

// TODO Auto-generated method stub

List<WebElement> o_col_rows = _locator.findElements(By.tagName("tr"));

int i_row_count = o_col_rows.size();

List<WebElement> o_col_clms;

int i_clm_count;

String cell_text;

//HashMap<Integer,HashMap<Integer,String>> o = new

HashMap<Integer, HashMap<Integer, String>> result_map= new HashMap<Integer,HashMap<Integer,String>>();

HashMap<Integer, String> o_col_map=null;;

for (int i=0;i<i_row_count;i++) {

o_col_clms = o_col_rows.get(i).findElements(By.tagName("td"));

i_clm_count = o_col_clms.size();

for(int j=0;j<i_clm_count;j++) {

cell_text = o_col_clms.get(j).getText();

//System.out.println(cell_text);

o_col_map.put(j, cell_text);

}

result_map.put(i, o_col_map);

}

return result_map;

}//end method

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Java Programming Tutorial Credits: Practice problems taken from below Site. http://www.ntu.edu.sg/home/ehchua/programming/java/j2a_basicsexercises.html#zz-5 Exercises on Java Basics You need to do these…

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Java_Tutorial 5: Conditional Statements in Java-If-then-Else

December 1, 2016 admin

The if-then and if-then-else Statements The if-then Statement The if-then statement is the most basic of all the control flow…

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Java_Code: My First Calculator Program

September 28, 2016 admin

Below Program is a Demonstrate usage of Class, Objects, variables and Methods. Calculator Class Source File:

package com.mypacakage.demo;


class CalculatorClass {
	
	int val1;
	int val2;
	int result;
	String operation;
	
	//Call Below Function after Object creation with arguments
	//These function will set Result instance variable and display the result
	//Addition Function
	public void addition(int arg1, int arg2){
		
		result = arg1+arg2;
		
	}
	
	//Subtraction Function
	public void subtraction(int arg1, int arg2){
		
		result = arg1-arg2;
		
	}
	
	//Multiplication Function
	public void multiplication(int arg1, int arg2){
		
		result = arg1*arg2;
		
	}
	
	//Division Function
	public void division(int arg1, int arg2){
		
		result = arg1/arg2;
		
	}
	
	//Call any Operation
	//Function to Demonstrate that while Object is created from other Class Function,
	//we can set the Class instance variable val1 and val2 and just call the this function
	public void call_any_ops(char ops){
		
		switch(ops){
			case 'A':
				addition(val1,val2);
				break;
			case 'S' :
				subtraction(val1,val2);
				break;
			case 'D' :
				multiplication(val1,val2);
				break;				
			case 'M' :
				division(val1,val2);
				break;
		
		}
		
		//Call Show Result Method
		showresult();
	}
	
	
	public void showresult(){
		System.out.println("Result of the Operation: " + result);
	}


}

package com.mypacakage.demo;

class CalculatorClass {

int val1;

int val2;

int result;

String operation;

//Call Below Function after Object creation with arguments

//These function will set Result instance variable and display the result

//Addition Function

public void addition(int arg1, int arg2){

result = arg1+arg2;

}

//Subtraction Function

public void subtraction(int arg1, int arg2){

result = arg1-arg2;

}

//Multiplication Function

public void multiplication(int arg1, int arg2){

result = arg1*arg2;

}

//Division Function

public void division(int arg1, int arg2){

result = arg1/arg2;

}

//Call any Operation

//Function to Demonstrate that while Object is created from other Class Function,

//we can set the Class instance variable val1 and val2 and just call the this function

public void call_any_ops(char ops){

switch(ops){

case 'A':

addition(val1,val2);

break;

case 'S' :

subtraction(val1,val2);

break;

case 'D' :

multiplication(val1,val2);

break;

case 'M' :

division(val1,val2);

break;

}

//Call Show Result Method

showresult();

}

public void showresult(){

System.out.println("Result of the Operation: " + result);

}

CalculatorTest Class Source…

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Java_Code:Object, Classes, Methods, Constructor usage

September 26, 2016 admin

Demonstrating Object Classes and Methods Usage Addition and Subtraction as methods of the Public Class Multiplication as Object of Different…

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Java Tutorials-12-Functions and Methods

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A Java method is a collection of statements that are grouped together to perform an operation. When you call the…

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Java Tutorials-9-String Handling In Java

September 17, 2016 admin

Java String In java, string is basically an object that represents sequence of char values. An array of characters works…

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java-Constructors and Methdods

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What is Constructor? When the object is created, Java calls the constructor first. Any code you have in your constructor…

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Java-Tutorials-4-Java Variables

September 11, 2016 admin

Java Variables: Java is a strongly typed programming language. This means that every variable must have a data type associated…

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Java-Tutorials-5-Conversion Functions-String to Int

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Convert using Integer.toString(int) The Integer class has a static method that returns a String object representing the specified int parameter.…

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Java Tutorial-1-JAVA-OOPS

September 10, 2016 admin

Java OOPs Concepts In this page, we will learn about basics of OOPs. Object Oriented Programming is a paradigm that…

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