Core java part 2

public class Recursion {

static int fact (int num)

{

       if(num==1)

       {

              return 1;

             

       }

       else

             

       {

              return num *=fact(num-1);

       }

}

public static void main(String[] args) {

        int d=fact (5);

        System.out.println(d);

      

}

}

//Basic example On Obect and class

public class Guardian {

       int gid;

       String gname;

       public static void main(String[] args) {

              Guardian guardian=new Guardian();

              System.out.println(guardian.gid);

              System.out.println(guardian.gname);

       }

}

O/p: --

0

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//  Triangle Area

public class Triangle {

       int length;

       int bredth;

       void  insert(int l, int b)

       {

             

              length=l;

              bredth=b;

             

       }

       void calculateArea()

       {

             

              System.out.println((length* bredth)/2);

             

       }

public static void main(String[] args) {

      

       Triangle t=new Triangle();

       t.insert(12, 10);

       t.calculateArea();

      

}

}

O/P:=

60

Annomous Obect :

public class Sample2 {

       int id;

       String name;

      

       public static void main(String[] args) {

              System.out.println(new Sample2().id);

             

             

       }

      

}

O/P:-

// Creating multiple objects by one type only

public class Sample2 {

       int id;

       String name;

      

       public static void main(String[] args) {

               Sample2 s=new Sample2(),s1=new Sample2();

               System.out.println(s.id);

               System.out.println(s.name);

               System.out.println(s1.id);

               System.out.println(s1.name);

             

             

       }

      

}

// Creating multiple objects by one type only

public class Sample2 {

       int id=101;

       String name="Sravan";

      

       public static void main(String[] args) {

               Sample2 s=new Sample2(),s1=new Sample2();

               System.out.println(s.id);

               System.out.println(s.name);

               System.out.println(s1.id);

               System.out.println(s1.name);

             

             

       }

      

}

//Method Over Loading

public class Calculation {

       void sum(int a, int b)

       {

              System.out.println(a+b);

       }

      

       void sum(int a, int b,int c)

       {

              System.out.println(a+b+c);

       }

       public static void main(String[] args) {

              Calculation c=new Calculation();

              c.sum(12, 80);

              c.sum(12, 123, 89);

       }

}

O/p:=

92

224

// Method Over Loading By changing the retrn tye

public class Calculation {

       void sum(int a, int b)

       {

              System.out.println(a+b);

       }

      

       int  sum(int a, int b)

       {

              System.out.println(a+b);

              return a+b;

       }

       public static void main(String[] args) {

              Calculation c=new Calculation();

              c.sum(12, 80);

              c.sum(12, 123);

       }

}

//Over Loading Main Metod

public class Test {

       public static void main(String[] args) {

       Demo.  main(12);

             

       }

}

class Demo

{

       public static void main(int c) {

              System.out.println(c);

             

       }

}

//Constrctor

public class Employee {

       int id;

       String name;

       public Employee() {

       System.out.println(" i am constructor");

       }

      

public static void main(String[] args) {

       Employee e=new Employee();

       System.out.println(e.id );

       System.out.println(e.name);

}

}

O/p:---

i am constructor

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