InstanceOfJava

Java Program to find Max occurred character in a string

Posted by: Instanceofjava Posted date: 3:44 PM / comment : 0 Core java Interview Questions

How to print duplicate characters from string in java?
Java program to count number of repeated characters in a string.
Java program for printing a repetitive letters in a string
count occurrences of each character in string java

package com.javatutorial;
public class MaxOccuranceOfChar{
public static String MaxOccuredChar(String str) {
char[] array = str.toCharArray();
int maxCount = 1;
char maxChar = array[0];
for(int i = 0, j = 0; i < str.length() - 1; i = j){
int count = 1;
while (++j < str.length() && array[i] == array[j]) {
count++;
}
if (count > maxCount) {
maxCount = count;
maxChar = array[i];
}
}
return (maxChar + " = " + maxCount);
}
public static void main(String[] args) {
String str1=MaxOccuredChar("instanceofjava");
System.out.println(str1);
String str2=MaxOccuredChar("aaaabbbccc");
System.out.println(str2);
String str3=MaxOccuredChar("ssssiiinnn");
System.out.println(str3);
String str4=MaxOccuredChar("jaaaavvvvvvvvaaaaaaaaaa");
System.out.println(str4);
}
}

Output:

i = 1
a = 4
s = 4
a = 10

Java program to check two strings are anagrams

Posted by: Instanceofjava Posted date: 3:27 PM / comment : 0 Core java Interview Questions

package com.javatutorial;
import java.util.Arrays;
public class CheckAnagramStrings {
private static boolean isAnagram(String str1, String str2) {
if (str1.length() != str2.length()) {
return false;
}
str1 = sortCharacters(str1);
str2 = sortCharacters(str2);
return str1.equals(str2);
}
private static String sortCharacters(String str) {
char[] charArray = str.toLowerCase().toCharArray();
Arrays.sort(charArray);
return String.valueOf(charArray);
}
public static void main(String[] args) {
String str1 = "bemru";
String str2 = "mureb";
if (isAnagram(str1, str2)) {
System.out.println(str2 + " is anagram of " + str1);
} else {
System.out.println("Strings are not anagrams.");
}
}
}

Output:

mureb is anagram of bemru

Java Program to count number of vowels in a string

Posted by: Instanceofjava Posted date: 12:08 PM / comment : 0 Core java Interview Questions

Solution #1:

package com.javatutorial;
public class CountNumberofVowels {
public static void main(String[] args) {
System.out.println("Please enter a String");
Scanner in = new Scanner(System.in);
String input = in.nextLine();
char[] Chararray = input.toCharArray();
int count = 0;
for (char ch : Chararray) {
switch (ch) {
case 'a':
case 'e':
case 'i':
case 'o':
case 'u':
case 'A':
case 'E':
case 'I':
case 'O':
case 'U':
count++;
break;
default:
}
}
System.out.println("Number of vowels in String "+count);
}
}

Output:

Please enter a String
Instance Of Java
Number of vowels in String 6

Solution #2:

package com.javatutorial;
public class CountNumberofVowels {
public static void main(String[] args) {
int vowels = 0, digits = 0, blanks = 0; char ch;
System.out.println("Please enter a String");
Scanner in = new Scanner(System.in);
String testString= in.nextLine();
for(int i = 0; i < testString.length(); i ++)
{
ch = testString.charAt(i);
if(ch == 'a' || ch == 'A' || ch == 'e' || ch == 'E' || ch == 'i' ||
ch == 'I' || ch == 'o' || ch == 'O' || ch == 'u' || ch == 'U')
vowels ++;
else if(Character.isDigit(ch))
digits ++;
else if(Character.isWhitespace(ch))
blanks ++;
}
System.out.println("Vowels : " + vowels);
System.out.println("Digits : " + digits);
System.out.println("Blanks : " + blanks);
}
}

Output:

Please enter a String
vowels and consonants
Vowels : 6
Digits : 0
Blanks : 2

Java Program to Count the number of occurrences of a char in a String?

Posted by: Instanceofjava Posted date: 11:15 AM / comment : 2 Core java Interview Questions

Solution #1:

package com.javatutorial;
import java.util.Scanner;
public class CountNumberofChars {
public static void main(String[] args) {
String str = "";
Scanner in= new Scanner(System.in);
System.out.println("Please enter a String");
str=in.nextLine();
System.out.println("Please enter a Character");
String chr=in.next();
int charCount = str.length() - str.replaceAll("a", "").length();
System.out.println("Number of occurances of given character:"+charCount);
}
}

Output:

Please enter a String
Java
Please enter a Character
a
Number of occurances of given character:2

Solution #2:

package com.javatutorial;
import java.util.Scanner;
public class CountNumberofChars {
public static int countOccurrences(String find, String string)
{
int count = 0;
int indexOf = 0;
while (indexOf > -1)
{
indexOf = string.indexOf(find, indexOf + 1);
if (indexOf > -1)
count++;
}
return count;
}
public static void main(String[] args) {
int charCount=countOccurrences("a", "Instance of Java");
System.out.println("Number of occurrences of given character:"+charCount);
}
}

Output:

Number of occurrences of given character: 3

Java experience interview programming questions on Strings

Java program To Count the number of words in a String

Posted by: Instanceofjava Posted date: 10:53 AM / comment : 1 Core java Interview Questions

package com.javatutorial;
public class CountNumberofWords {
public static void main(String[] args) {
String s="";
int count=0;
Scanner in = new Scanner(System.in);
System.out.println("Please enter a String");
s=in.nextLine();
char ch[]= new char[s.length()];
for(int i=0;i<s.length();i++)
{
ch[i]= s.charAt(i);
if( ((i>0)&&(ch[i]!=' ')&&(ch[i-1]==' ')) || ((ch[0]!=' ')&&(i==0)) )
count++;
}
System.out.println("Number of words in given String: "+count);
}
}

Output:

Please enter a String
Java Tutorial
Number of words in given String: 2

Pattern Program in java Part-3

Posted by: Instanceofjava Posted date: 10:25 AM / comment : 0 concept and program

Program #1: java program to print pyramid of stars using for loop in below format

*
**
***
****
*****
******
*******
********
*********
**********

package com.learnJavaOnline;
public class PrintStarsFormat {
public static void main(String[] args) {
int numberOfStars=10;
for (int row = 1; row <= 10; row++) {
for(numberOfStars = 1; numberOfStars <= row; numberOfStars++) {
System.out.print("*");
}
System.out.println();
}
}
}

Output:

*
**
***
****
*****
******
*******
********
*********
**********

Program #2: java program to print pyramid of stars using for loop in below format

**********
*********
********
*******
******
*****
****
***
**
*

package com.learnJavaOnline;
public class PrintStarsPyramid {
public static void main(String[] args) {
int numberOfStars=10;
for(int i=numberOfStars; i>0 ;i--){
for(int j=0; j < i; j++){
System.out.print("*");
}
System.out.println("");
}
}
}

Output:

**********
*********
********
*******
******
*****
****
***
**
*

Program #3 java program to print pyramid of stars using for loop in below format

*
**
***
****
*****
******
*******
********
*********
**********
**********
*********
********
*******
******
*****
****
***
**
*

package com.learnJavaOnline;
public class PrintStarsPyramid {
public static void main(String[] args) {
int numberOfStars=10;
for(int i=1; i<= numberOfStars ;i++){
for(int j=0; j < i; j++){
System.out.print("*");
}
System.out.println("");
}
for(int i=numberOfStars; i>0 ;i--){
for(int j=0; j < i; j++){
System.out.print("*");
}
System.out.println("")}
}
}

Output:

*
**
***
****
*****
******
*******
********
*********
**********
**********
*********
********
*******
******
*****
****
***
**
*

Print Pascals triangle using java program

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