InstanceOfJava

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

Pattern Program in java Part-2

Posted by: Instanceofjava Posted date: 11:41 PM / comment : 0 concept and program

#4 Java Program to print Numbers in Below pattern

1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
   1 2 3 4 5 6
    1 2 3 4 5
     1 2 3 4
      1 2 3
       1 2
        1

package com.learnJavaOnline;
public class NumbersFormat {
public static void main(String[] args) {
int r, c1,c2;
for (r = 1; r <= 10; r++) {
for (c1 = 1; c1 <r; c1++) {
System.out.print(" ");
}
for (c2 = 1; c2 <= 10 - r; c2++) {
System.out.print(c2 + " ");
}
System.out.println("");
}
}
}

Output:

1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

#5 Java Program to Print Numbers in Below pattern:

        1
       1 2
      1 2 3
     1 2 3 4
    1 2 3 4 5
   1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10

package com.learnJavaOnline;
public class NumbersFormat {
public static void main(String[] args) {
int r, c1,c2;
for (r = 1; r <= 10; r++) {
for (c1 = 1; c1 <10-r; c1++) {
System.out.print(" ");
}
for (c2 = 1; c2 <= r; c2++) {
System.out.print(c2 + " ");
}
System.out.println("");
}
}
}

Output:

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10

Print Pascals triangle using java program

Pattern Program in java Part-1

Posted by: Instanceofjava Posted date: 11:12 PM / comment : 0 concept and program

#1 Java Program To print Numbers in Below pattern:

              1
             2 3
            4 5 6
           7 8 9 10
         11 12 13 14 15

package com.javatutorial;
public class NumbersFormat {
public static void main(String[] args) {
int num=15;
int temp=1;
for (int i = 1; i <= num; i++)
{
for (int k = i; k <num; k++)
System.out.print(" ");
for (int j =1; j <= i; j++){
System.out.print("" +temp+ " ");
temp++;
if(temp>15){
break;
}
}
System.out.println();
if(temp>15){
break;
}
}
}
}

Output:

              1
             2 3
            4 5 6
           7 8 9 10
          11 12 13 14 15

# Java Program to print Numbers in Below Format:

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10

package com.learnJavaOnline;
public class NumbersFormat {
public static void main(String[] args) {
int r, c;
for (r = 1; r <= 10; r++) {
for (c = 1; c <= r; c++) {
System.out.print(c + " ");
}
System.out.println("");
}
}
}

Output:

1
1 2
1 2 3
1 2 3 4
1 2 3 4 5
1 2 3 4 5 6
1 2 3 4 5 6 7
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10

#3 Java Program to print numbers in below format

1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

package com.learnJavaOnline;
public class NumbersFormat {
public static void main(String[] args) {
int r, c;
for (r = 1; r <= 10; r++) {
for (c = 1; c <= 10-r; c++) {
System.out.print(c + " ");
}
System.out.println("");
}
}
}

Output:

1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7
1 2 3 4 5 6
1 2 3 4 5
1 2 3 4
1 2 3
1 2
1

Print Pascals triangle using java program

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