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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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