Method overloading, recursion, passing and returning objects from method, new operator
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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.
![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](https://image.slidesharecdn.com/javappt-180817072331/85/Method-overloading-recursion-passing-and-returning-objects-from-method-new-operator-10-320.jpg)
![// 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](https://image.slidesharecdn.com/javappt-180817072331/85/Method-overloading-recursion-passing-and-returning-objects-from-method-new-operator-13-320.jpg)
![// 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](https://image.slidesharecdn.com/javappt-180817072331/85/Method-overloading-recursion-passing-and-returning-objects-from-method-new-operator-15-320.jpg)
Method overloading, recursion, passing and returning objects from method, new operator
- 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