1.Q. Write a Java program to accept three numbers and find the largest of the three using polymorphism concept of method overloading.
Solution:
public class LargestNumber{
//Method to find the largest of three integers using method overloading
public int findLargestNum( int a , int b , int c ) {
int largest=a;
if(b > largest ) {
largest=b;
}
else if (c>largest){
largest=c;
}
return largest;
}
//Method to find the largest of three double numbers using method overloading
public double findLargest ( double a , double b , double c ) {
double largest=a;
if(b>largest){
largest=b;
}
else if( c> largest ) {
largest=c;
}
return largest;
}
public static void main ( String args[] ) {
LargestNumber lar= new LargestNumber();
int num1=65 , num2=23, num3=45;
System.out.println(“Largest Integer number is:” + lar.findLargest(num1,num2,num3));
//Accepting three double numbers
double num4=65.5, num5= 23.6, num6=45.8;
System.out.println(“Largest double number is:”+lar.findLargest(num4,num5,num6));
}
}
OUTPUT:
Largest integer number is : 65
Largest double number is: 65.5
2.Q. Create a class Student with overloaded constructors to initialize student details based on different combination of arguments. Ensure that the constructors support the creation of objects in various ways.
Solution:
class Student{
private String sname;
private int rollno;
private String address;
//Constructor to initialize only student name
public Student(String sname) {
this.sname=sname;
}
//constructor to imitialize student name and roll no of student
public Student(String sname , int rollno){
this.sname=sname;
this.rollno=rollno;
}
//constructor to initialize student name , roll no and address of the student
public Student(String sname , int rollno , String address){
this.sname=sname;
this.rollno=rollno;
this.address=address;
}
//Method to display Student details
public void displayDetails() {
System.out.println(“Student name”+sname);
if(rollno!=0){
System.out.println(“Roll no is :” +rollno);
}
if(address!=null){
System.out.println(“Address is :”+address);
}
}
//Main method to test Student class
public static void main(String args[]) {
Student stu1=new Student(“joy”);
stu1.displayDetails();
Student stu2= new Student(“joy”, 189);
stu2.displayDetails();
Student stu3= new Student(“felix”,134,”new york”);
stu3.displayDetails();
}
}
OUTPUT:
Student name : joy
Student name: joy
Roll no is : 189
Student name : felix
Roll no is : 134
Address is : new york