This document discusses method overloading, recursion, and passing and returning objects from methods in Java. It provides examples of using the new operator to dynamically allocate memory for objects, a recursive method to calculate a factorial, passing an object as an argument to a method to check equality, and returning a new object from a method that increments a field.

1. Method overloading, recursion , passing
and returning objects from method, new
operator
Prepared By : -
Jainam Kapadiya

2. Contents of the Presentation
 Method and Method overloading
 How to overload method in JAVA?
 Method overloading Examples of program.
New operator
Recursion
 Passing and returning objects from methods.

8.  The new operator allocates memory dynamically for an
object. Here is the general form to use new operator in Java.
New Operator
class-var = new classname();
 Here, class-var is the variable of the class type being
created. The classname is the name of the class that is being
instantiated.
 The class name followed by the parentheses determines
the constructor for the class. A constructor defines what
occurs whenever an object of a class is created.
 Constructors are an crucial part of all the classes and have
many significant attributes.

10. public class Recursion
{
static int factorial(int n)
{
if (n == 1)
return 1;
else
return(n * factorial(n-1));
}
public static void main(String[] args)
{
System.out.println("Factorial of 5 is: "+factorial(5));
}
}
O/P:-
Factorial of 5 is: 120
RECURSION PROGRAM

12. Example:-
// Java program to demonstrate objects
// passing to methods.
class ObjectPassDemo
{
int a, b;
ObjectPassDemo(int i, int j)
{
a = i;
b = j;
}
// return true if o is equal to the invoking
// object notice an object is passed as an
// argument to method
boolean equalTo(ObjectPassDemo o)
{
return (o.a == a && o.b == b);
}
}

13. // Driver class
public class Test
{
public static void main(String args[])
{
ObjectPassDemo ob1 = new ObjectPassDemo(100, 22);
ObjectPassDemo ob2 = new ObjectPassDemo(100, 22);
ObjectPassDemo ob3 = new ObjectPassDemo(-1, -1);
System.out.println("ob1 == ob2: " + ob1.equalTo(ob2));
System.out.println("ob1 == ob3: " + ob1.equalTo(ob3));
}
}
Output:
ob1 == ob2: true
ob1 == ob3: false

15. // This method returns an object
Test incrByTen()
{
Test temp =
new Test(a+10);
return temp;
}
}
// Driver class
class returningobject
{
public static void main(String args[])
{
Test ob1 = new Test(2);
Test ob2;
ob2 = ob1.incrByTen();
System.out.println("ob1.a: " + ob1.a);
System.out.println("ob2.a: " + ob2.a);
}
}
Output:
ob1.a: 2 ob2.a: 12