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  • Java programs For Practice



    Here are the 13 java programs for you to practice and hone your programming skills with java.

    Basic program in Java
    Java Programs on numbers
    Programs on strings in Java
    Advanced Java Programs
    Programs on Arrays in Java
    Recursion Programs In Java
    Searching/Sorting Program In Java

    Java Programs on numbers

    Fibonacci Series Program In Java(without recursion)
    Factorial Program In Java
    Java Program to check for leap year

    Programs On Strings In Java

    Java Program To Reverse A String
    Java Program For Sorting A String
    Java Program for counting Consonants and Vowels in a String

    Programs On Arrays In Java

    Java Program for printing duplicates from an Array
    Java program to sort elements in Array
    Java program for reversing elements of an Array

    Recursion Programs in Java

    Java program to check for palindrome(with recursion)
    Java program to reverse a string (with recursion)

    Searching/Sorting Program In Java

    Java program to implement the bubble sort algorithm
    Java program to implement the binary search algorithm

    Java Programs on numbers

    Fibonacci Series Program In Java(without recursion)

    import java.util.Scanner;

     

    public class Fibonacci{

      public static void main(String args[]) {

        System.out.println(“How many Fibonacci terms do you want? “);

        // creating a scanner object

        Scanner scn = new Scanner(System.in);

        int counter = scn.nextInt(); // taking the input with scanner

     

        int a = 0;

        int b = 1;

        int c, k;

        System.out.print(a + ” ” + b); // fib value for 0 and 1

     

        for (k = 2; k < counter; ++k) // looping starts from 2

        {

          c = a + b;

          System.out.print(” ” + c);

          a = b;

          b = c;

        }

        scn.close();

      }

    }

    Output for the above program

    How many Fibonacci terms do you want? 7 

    0 1 1 2 3 5 8

    Factorial Program In Java

    import java.util.Scanner;

     

    public class Main {

     public static void main(String args[]) {

       System.out.println(“Find the factorial of: “);

       // creating a scanner object

       Scanner scn = new Scanner(System.in);

       int number = scn.nextInt(); // taking the input with scanner

     

       int k, fact = 1; // first factorial value

     

       for (k = 1; k <= number; k++) {

         fact = fact * k;

       }

       System.out.println(“Factorial of ” + number + ” is: ” + fact);

       scn.close();

     }

    }

    Output for the above program

    Find the factorial of: 

    6

    Factorial of 6 is: 720

    Java Program to check for leap year

    import java.util.Scanner;

     

    public class Leap{

     

     public static void main(String[] args) {

       System.out.println(“Check leap year for: “);

       Scanner scn = new Scanner(System.in); // scanner object

       int yr = scn.nextInt(); // taking the input with scanner

       boolean leap_yr = false;

     

       if (yr % 4 == 0) {

         if (yr % 100 == 0) {

           // if yr is divisible by 400 it is a leap year

           if (yr % 400 == 0)

             leap_yr = true;

           else

             leap_yr = false;

         } else

           leap_yr = true;

       } else

         leap_yr = false;

     

       if (leap_yr)

         System.out.println(yr + ” is a leap year.”);

       else

         System.out.println(yr + ” is not a leap year.”);

       scn.close();

     }

    }

    Output 1 for the above program 

    Check leap year for: 

    1990

    1990 is not a leap yr.

    Output 2 for the above program 

    Check leap year for: 

    2020

    2020 is a leap year.

    Programs On Strings In Java

    Java Program To Reverse A String

    import java.util.Scanner;

     

    public class Main {

     public static void main(String[] args) {

       System.out.println(“Reversed string for: “);

       Scanner scn = new Scanner(System.in); // scanner object

       String str = scn.nextLine(); // taking the input with scanner

       // For storing the reverse of the given string

       String reversedStr = “”;

     

       // Iterate string from last and add each character to reversedStr

       for (int s = str.length() – 1; s >= 0; s–) {

         reversedStr = reversedStr + str.charAt(s);

       }

     

       System.out.println(“Original string: ” + str);

       //reverse of the given string

       System.out.println(“Reversed string: ” + reversedStr);

       scn.close();

     }

    }

    Output for the above program

    Reversed string for: year

    Original string: year

    Reversed string: raey

    Java Program For Sorting A String

    import java.util.Arrays;

    import java.util.Scanner;

    public class Main {

     public static void main(String[] args) {

       // creating an object of Scanner class for input

       Scanner scn = new Scanner(System.in);

       // taking input from users with scn

       System.out.print(“First String: “);

       String str_1 = scn.nextLine();

       System.out.print(“Second String: “);

       String str_2 = scn.nextLine();

       if(str_1.length() == str_2.length()) {

         // converting strings to arrays

         char[] arr_1 = str_1.toCharArray();

         char[] arr_2 = str_2.toCharArray();

         // sorting the arrays

         Arrays.sort(arr_1);

         Arrays.sort(arr_2);

         boolean ang = Arrays.equals(arr_1, arr_2);

         if(ang) {

           System.out.println(“The strings are valid anagram.”);

         }

         else {

           System.out.println(“The strings are not valid anagram.”);

         }

       }

       else{

         System.out.println(“The strings are not valid anagrams”);

       }

       scn.close();

     }

    }

    Output for the above program

    First String: reader

    Second String: read

    The strings are not valid anagrams

    Java Program For Counting Consonants And Vowels In A String

    import java.util.Scanner;

     

    public class Main {

     public static void main(String[] args) {

     

       int vowel = 0;

       int consonant = 0;

       // creating an object of Scanner for input

       Scanner scn = new Scanner(System.in);

       // taking input from users with scn

       System.out.print(“Your String: “);

       String strng = scn.nextLine();

     

       input = input.toLowerCase();

     

       for (int s = 0; s < strng.length(); s++) 

    {

         if (strng.charAt(s) == ‘a’ || strng.charAt(s) == ‘e’ || strng.charAt(s) == ‘i’ || strng.charAt(s) == ‘o’

             || strng.charAt(s) == ‘u’) {

           // Increments the vowel counter

           vowel++;

         } else if (strng.charAt(s) >= ‘a’ && strng.charAt(s) <= ‘z’) {

           consonant++;

         }

       }

       System.out.println(“vowels: ” + vowel);

       System.out.println(“consonants: ” + consonant);

       scn.close();

     }

    }

    Output for the above program

    Your String: the simplest string ever

    Number of vowels: 6

    Number of consonants: 15

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    Programs On Arrays In Java

    Java Program for printing duplicates from an Array

    public class Duplicate{

     public static void main(String[] args) {

     

       int[] array = new int[] { 1, 1, 2, 3, 5, 2, 3, 5, 7 };

     

       System.out.println(“Founded these duplicate elements: “);

       for (int r = 0; r < array.length; r++) {

         for (int c = r + 1; c < array.length; c++) {

           if (array[r] == array[c])

             System.out.println(array[c]);

         }

       }

     }

    }

    Output for the above program

    Founded these duplicate elements: 

    1

    2

    3

    5

    Java program to sort elements in Array

    public class Sort {

     public static void main(String[] args) {

     

       // Initialize the original array

       int[] array = new int[] { 4,6,7,1,2,4 };

       int tmp = 0;

       int len = array.length

     

       // Sort the array in ascending order

       for (int h = 0; h < len; h++) {

         for (int c = h + 1; c < len; c++) {

           if (array[h] > array[c]) {

             tmp = array[k];

             array[h] = array[c];

             array[c] = tmp;

           }

         }

       }

     

       System.out.println();

     

       // Elements of array after sort

       System.out.println(“Array after sorting: “);

       for (int h = 0; h < len; h++) {

         System.out.print(array[h] + ” “);

       }

     }

    }

    Output for the above program

    Sorted elements: 

    1 2 4 4 6 7

    Java program for reversing elements of an Array

    public class Main {

     public static void main(String[] args) {

       // Initialize array

       int[] arr = new int[] { 1, 1, 2, 3, 5 };

       len = arr.length

       System.out.println(“reversed array : “);

       // Looping through array from last

       for (int h = len – 1; h >= 0; h–) {

         System.out.print(arr[h] + ” “);

       }

     }

    }

    Output for the above program

    reversed array : 

    5 3 2 1 1 

    Recursion Programs in Java

    Java program to check for palindrome(with recursion)

    class Palindrome {

     static int pal(int num, int tmp) {

       // base case

       if (num == 0)

         return tmp;

       tmp = tmp * 10 + num % 10;

     

       return pal(num / 10, tmp);

     }

     

     public static void main(String[] args) {

       int num = 1221;

       int tmp = pal(num, 0);

     

       if (tmp == num)

         System.out.println(“A palindrome number”);

       else

         System.out.println(“Not a palindrome number”);

     }

    }

    Output for the above program

    A palindrome number

    Java program to reverse a string (with recursion)

    public class ReversedString {

       public String reverse(String strng){

       

          if(strng.isEmpty()){

             return strng;

          } else {

             return reverse(strng.substring(1))+strng.charAt(0);

          }

       }

       public static void main(String[] args) {

          ReversedString obj = new ReversedString();

          String result = obj.reverse(“Fita Academy”);

          System.out.println(result);

       }

    }

    Output for the above program

    ymedacA atiF

    Java program to implement bubble sort algorithm

    import java.util.Arrays;

    import java.util.Scanner;

    class Main {

    // method to perform bubble sort

    void bubble(int arry[]) {

      int len = arry.length;

      // for getting elements from array arry

      for (int m = 0; m < len – 1; m++) {

        // for comparison

        for (int n = 0; n < len – m – 1; n++) {

          // comparing with the next element

          if (arry[n + 1] < arry[n]) {

            // performing swap

            int temp = arry[n];

            arry[n] = arry[n + 1];

            arry[n + 1] = temp;

          }

        }

      }

    }

    // driver method

    public static void main(String args[]) {

      int[] array = { -2, 4, -6, 0, 9 };

      // creating an object of Main

      Main bs = new Main();

      bs.bubble(array);

      System.out.println(“Sorted array:”);

      // for converting int to string

      System.out.println(Arrays.toString(array));

    }

    }

    Output for the above program

    Sorted array:

    [-6, -2, 0, 4, 9]

    Java program to implement the binary search algorithm

    import java.util.Scanner;

    import java.util.Arrays;

     

    class Main {

     int binarySearch(int arr[], int element, int lower, int higher) {

     

       while (lower <= higher) {

     

         // get index of middle element

         int middle = lower + (higher – lower) / 2;

     

         // if element to be searched is middle

         if (arr[middle] == element)

           return middle;

     

         // if element is lesser than middle

         // search on the left of middle

         if (arr[middle] < element)

           lower = middle + 1;

     

         // if element is greater than middle

         // search on the right of middle

         else

           higher = middle – 1;

       }

     

       return -1;

     }

     

     public static void main(String args[]) {

     

       // create an object of the Main class

       Main obj = new Main();

     

       int[] arr = { 3, 4, 5, 6, 7, 8, 9 };

       int n = arr.length;

     

       // creating a scanner object to take input from a user

       Scanner scn = new Scanner(System.in);

     

       System.out.println(“Element to be searched for:”);

     

       int element = scn.nextInt();

       scn.close();

     

       int res = obj.binarySearch(arr, element, 0, n – 1);

       if (res == -1)

         System.out.println(“Element not found in the array”);

       else

         System.out.println(“Element found in array at index ” + res);

     }

    }

    Output for the above program

    Element to be searched for:

    5

    Element found in array at index 2

    These were few practice programs for java. To get in depth knowledge of core Java and advanced java, J2EE and SOA training along with its various applications and real-time projects using Servlets, Spring with Aspect Oriented Programming (AOP) architecture, Hibernate Framework,and Struts through JDBC you can enroll in Certified Java Training in Chennai or Certified Java Course in Bangalore by FITA or a virtual class for this course,at an affordable price, bundled with real time projects, certification, support, and career guidance assistance and an active placement cell, to make you an industry required certified java developer.

    FITA’s courses training is delivered by professional experts who have worked in the software development and testing industry for a minimum of 10+ years, and have experience of working with different software frameworks and software testing designs.




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