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1.
class Person
{
String name,dob;
double mno;
Person(String name,double mno,String dob)
{
this.name=name;
this.mno=mno;
this.dob=dob;
}
void print_data()
{
System.out.println("Name:"+name);
System.out.println("Mobile number:"+mno);
System.out.println("Date of birth:"+dob);
}
}
class Employee extends Person
{
int eno,salary;
String org,des,doj;
Employee(int eno,String org,String des,int salary,String doj)
{
super("John",9876543210d,"10/11/1998");
this.eno=eno;
this.org=org;
this.des=des;
this.salary=salary;
this.doj=doj;
}
void print_info()
{
super.print_data();
System.out.println("Emp number:"+eno);
System.out.println("Organization Name:"+org);
System.out.println("Designation:"+org);
System.out.println("Date of birth:"+dob);
}
}
class Imple_exam
{
public static void main(String args[])
{
Employee e=new Employee(101,"Infosys","Software developer",100000,"01/01/2023");
e.print_info();
}
}
2. WAP to print the count of vowels in a given string.
import java.lang.*;
import java.util.*;
class Count_vowels
{
public static void main(String args[])
{
String msg,str;
Scanner s=new Scanner(System.in);
System.out.println("The given String is: ");
msg=s.nextLine();
str=msg.toLowerCase();
int i,c = 0;
char ch;
for(i=0;i<str.length();i++)
{
ch=str.charAt(i);
if(ch=='a'||ch=='e'||ch=='o'||ch=='i'||ch=='u')
{
c++;
}
}
System.out.println("Number of vowels in given string: " +c);
}
}
3.
Write a program to find area of circle, area of rectangle & area of
triangle by overloading functions.
import java.lang.*;
class Shape
{
void area(int r)
{
double a;
a=3.14*r*r;
System.out.println("Area of circle is"+a);
}
void area(int l,int w)
{
double a;
a=l*w;
System.out.println("Area of rectangle is"+a);
}
void area(float b,float h)
{
double a;
a=0.5*b*h;
System.out.println("Area of triangle is"+a);
}
}
class Area_tri
{
public static void main(String args[])
{
Shape s=new Shape();
s.area(3);
s.area(3,4);
s.area(2.0f,5.0f );
}
}
4. Write a program to demonstrate exception handling using try,
catch and finally block for ArrayIndexOutOfBoundsException.
class Demo_exception
{
public static void main (String[] args)
{
int a[] ={5,10};
int b=5;
try
{
int x = a[2]/(b-a[1]);
}
catch(ArrayIndexOutOfBoundsException e)
{
System.out.println("Array index error...");
}
finally
{
System.out.println("finally block executed");
int y=a[1]/a[0];
System.out.println(y);
}
}
}
5.
WAP uses a vector class to add 5 names of students initially.
Display a MENU: i) Add new name ii) Display names
Based on the choice entered by the user take appropriate action.
import java.util.*;
class Student_vector
{
public static void main(String args[])
{
Scanner br=new Scanner(System.in);
String str;
Vector v=new Vector();
int i,choice=0;
System.out.println("Enter 5 names:");
for(i=0;i<=4;i++)
{
str=br.next();
v.addElement(str);
}
while(choice!=3)
{
System.out.println("1.Add new name\n2.Display name\n3.Exit");
System.out.println("Enter your choice:");
choice=br.nextInt();
switch(choice)
{
case 1: System.out.println("Enter name:");
str=br.next();
v.addElement(str);
break;
case 2:
System.out.println("Current List:");
for(i=0;i<=v.size()-1;i++)
{
System.out.println(v.elementAt(i));
}
case 3:
break;
default:
System.out.println("Invalid choice");
}
}
}
}
6.Write programs to explain concept of abstract methods
1. Define abstract superclass Figure
2. Declare an abstract method area() in superclass
3. Define subclass Rectangle
import java.lang.*;
abstract class Figure
{
double dim1,dim2;
Figure(double a,double b)
{
dim1=a;
dim2=b;
}
abstract double area();
}
class Rectangle extends Figure
{
double area;
Rectangle(double a,double b)
{
super(a,b);
}
double area()
{
area=dim1*dim2;
return area;
}
}
class Figure_abstract
{
public static void main(String args[])
{
Figure f;
Rectangle r= new Rectangle(5,5);
f=r;
System.out.println("Area of Rectangle is:"+f.area());
}
}
7. WAP to define interface Department and Exam. Implement class
Student which implements these interfaces.
interface Department
{
int m1=18,m2=19,m3=12;
}
interface Exam extends Department
{
int s1=67,s2=45,s3=71;
void total_marks();
}
class Student_inter implements Department,Exam
{
public void total_marks()
{
int ds,cg,dlca;
ds=m1+s1;
cg=m2+s2;
dlca=m3+s3;
System.out.println("Marks of DS"+ds);
System.out.println("Marks of CG"+cg);
System.out.println("Marks of DLCA"+dlca);
}
public static void main(String args[])
{
Student_inter s=new Student_inter();
s.total_marks();
}
}
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