Core Java Programs free java guide

Some Java programs which help lot of java beginners to understand the basic fundamentals in Java programming.
 

 

 

Program 1

//Find Maximum of 2 nos.

class Maxof2{

  public static void main(String args[]){

      //taking value as command line argument.

      //Converting String format to Integer value

      int i = Integer.parseInt(args[0]);

      int j = Integer.parseInt(args[1]);

      if(i > j)

          System.out.println(i+" is greater than "+j);

      else

          System.out.println(j+" is greater than "+i);

  }

}

---

Program 2

//Find Minimum of 2 nos. using conditional operator

class Minof2{

      public static void main(String args[]){

      //taking value as command line argument.

      //Converting String format to Integer value

      int i = Integer.parseInt(args[0]);

      int j = Integer.parseInt(args[1]);

      int result = (i<j)?i:j;

      System.out.println(result+" is a minimum value");

  }

}

---

Program 3

/* Write a program that will read a float type value from the   keyboard and print the following output.

   ->Small Integer not less than the number.

   ->Given Number.

   ->Largest Integer not greater than the number.

*/

class ValueFormat{

  public static void main(String args[]){

      double i = 34.32; //given number 

      System.out.println("Small Integer not greater than the number : "+Math.ceil(i));

      System.out.println("Given Number : "+i);

      System.out.println("Largest Integer not greater than the number : "+Math.floor(i));

  }

---

Program 4

/*Write a program to generate 5 Random nos. between 1 to 100, and it

  should not follow with decimal point.

*/

class RandomDemo{

      public static void main(String args[]){

          for(int i=1;i<=5;i++){

              System.out.println((int)(Math.random()*100));

          }

    }

}

---

Program 5

/* Write a program to display a greet message according to

   Marks obtained by student.

*/

class SwitchDemo{

      public static void main(String args[]){

          int marks = Integer.parseInt(args[0]);                //take marks as command line argument.

         switch(marks/10){

            case 10:

            case 9:

            case 8:

                     System.out.println("Excellent");

                     break;

            case 7:

                     System.out.println("Very Good");

                     break;

            case 6:

                     System.out.println("Good");

                     break;

            case 5:

                     System.out.println("Work Hard");

                     break;

            case 4:

                     System.out.println("Poor");

                     break;

            case 3:

            case 2:

            case 1:

            case 0:

                     System.out.println("Very Poor");

                     break;

            default:

                     System.out.println("Invalid value Entered");

      }

 }

}

---

Program 6

/*Write a program to find SUM AND PRODUCT of a given Digit. */

class Sum_Product_ofDigit{

      public static void main(String args[]){

            int num = Integer.parseInt(args[0]);         //taking value as command line argument.

            int temp = num,result=0;

            //Logic for sum of digit

            while(temp>0){

               result = result + temp;

               temp--;

            }

            System.out.println("Sum of Digit for "+num+" is : "+result);

            //Logic for product of digit

            temp = num;

            result = 1;

            while(temp > 0){

                 result = result * temp;

                 temp--;

            }

            System.out.println("Product of Digit for "+num+" is : "+result);

   }

}

---

Program 7

/*Write a program to Find Factorial of Given no. */

class Factorial{

      public static void main(String args[]){

          int num = Integer.parseInt(args[0]);                 //take argument as command line

          int result = 1;

          while(num>0){

                result = result * num;

                num--;

          }

          System.out.println("Factorial of Given no. is : "+result);

   }

}

---

Program 8

/*Write a program to Reverse a given no. */

class Reverse{

      public static void main(String args[]){

          int num = Integer.parseInt(args[0]);               //take argument as command line

          int remainder, result=0;

          while(num>0){

              remainder = num%10;

              result = result * 10 + remainder;

              num = num/10;

         }

         System.out.println("Reverse number is : "+result);

    }

}

---

Program 9

/*Write a program to find Fibonacci series of a given no.

  Example :

        Input - 8

        Output - 1 1 2 3 5 8 13 21

*/

class Fibonacci{

      public static void main(String args[]){

          int num = Integer.parseInt(args[0]);                        //taking no. as command line argument.

          System.out.println("*****Fibonacci Series*****");

          int f1, f2=0, f3=1;

          for(int i=1;i<=num;i++){

             System.out.print(" "+f3+" ");

             f1 = f2;

             f2 = f3;

             f3 = f1 + f2;

          }

   }

}

---

Program 10

/* Write a program to find sum of all integers greater than 100 and

   less than 200 that are divisible by 7 */

class SumOfDigit{

      public static void main(String args[]){

      int result=0;

      for(int i=100;i<=200;i++){

           if(i%7==0)

              result+=i;

      }

      System.out.println("Output of Program is : "+result);

   }

}

 

 

 

 

 

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