Notes

Aim: WRITE A PROGRAM TO PERFORM ALL MATHEMATICAL FUNCTIONS (+,-,*,/,%) USING SWITCH CASE.
Objective: To PERFORM ALL MATHEMATICAL FUNCTIONS
Code:
import java.util.Scanner;
class Operation
{
public static void main(String args[])
{
float a,b,c;
char x;
Scanner op=new Scanner(System.in);
System.out.println("Enter a");
a=op.nextFloat();
System.out.println("Enter b");
b=op.nextFloat();
System.out.println("Enter the operation to be performed");
x=op.next().charAt(0);
switch(x)
{
case '+':
c=a+b;
System.out.println("Addition="+c);
break;
case '-':
c=a-b;
System.out.println("Subtraction="+c);
break;
case '*':
c=a*b;
System.out.println("Multiplication="+c);
break;
case '/':
c=a/b;
System.out.println("Division="+c);
break;
case '%':
if(a>b)
c=a%b;
else
c=b%a;
System.out.println("Modulo Division="+c);
break;
default:
System.out.println("Invalid operation");
}
}
}


AIM: : Write a program define a student class, describe its constructor, overload the constructor and initialize the object.

Code:
class Student
{
String uid;
String name;
float per;
int i;
Student()
{
uid="18bcs2247";
name="Sanskar Sachan";
System.out.println("UID="+uid);
System.out.println("Name="+name);
}
Student(float perc)
{


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per=perc;

System.out.println("Percentage="+per);
}
}
public class Call
{
public static void main(String args[])
{
Student obj=new Student();
Student obj1=new Student(95.5f);
}
}


AIM: Write a program in java to show details of Vehicle-Car class using Inheritance as Car is a Vehicle.
Code:
class Vehicle
{
int Vehicle_no;
String type;
void info()
{System.out.println("Parent class called");
System.out.println("Vehicle is an mode of transport and it can be of many types like car,bus..");
}
int number(int num)
{
Vehicle_no=num;
return Vehicle_no;
}
}
class Car extends Vehicle
{
String type;
void info()
{
super.type="Car";
type="Sports Car";
super.info();
System.out.println("Child class called");
System.out.println("Type of vehicle="+super.type);

18BCS2250 Page 1
JAVA PROGRAMMING LAB

System.out.println(type+" is type of "+super.type);
System.out.println("Parent class is called");
System.out.println(super.type+" number="+super.number(8909));
}
}
class Inherit
{
public static void main(String args[])
{
Car obj=new Car();
obj.info();
}
}


Program to study access modifiers in java using packages.

● Default

1. Package 1
//Java program to illustrate default modifier
package p1;

//Class Geeks is having Default access modifier
class Geek
{
void display()
{
System.out.println("Hello World!");
}
}

2. Package 2
//Java program to illustrate error while
//using class from different package with
//default modifier
package p2;
import p1.*;

//This class is having default access modifier
class GeekNew
{
public static void main(String args[])
{
//accessing class Geek from package p1
Geeks obj = new Geek();

obj.display();
}
}

● Private

//Java program to illustrate error while
//using class from different package with
//private modifier
package p1;

class A
{
private void display()
{
System.out.println("GeeksforGeeks");
}
}

class B
{
public static void main(String args[])
{
A obj = new A();
//trying to access private method of another class
obj.display();
}
}

● Public

1). Package 1
//Java program to illustrate
//public modifier
package p1;
public class A
{
public void display()
{
System.out.println("GeeksforGeeks");
}
}

2). Package 2
package p2;
import p1.*;
class B
{
public static void main(String args[])
{
A obj = new A;
obj.display();
}
}

● Protected

1). Package 1
package p1;
//Class A
public class A
{
protected void display()
{
System.out.println("GeeksforGeeks");
}
}

2). Package 2
//Java program to illustrate
//protected modifier
package p2;
import p1.*; //importing all classes in package p1

//Class B is subclass of A
class B extends A
{
public static void main(String args[])
{
B obj = new B();
obj.display();
}

}


Program to differentiate between method overloading and method overriding.:-

● CODE:-

1). Method Overriding

class Dog{
public void bark(){
System.out.println("woof ");
}
}
class Hound extends Dog{
public void sniff(){
System.out.println("sniff ");
}

public void bark(){
System.out.println("bowl");
}
}

public class OverridingTest{
public static void main(String [] args){
Dog dog = new Hound();
dog.bark();
}
}

2). Method Overloading

class Dog{
public void bark(){
System.out.println("woof ");
}

//overloading method
public void bark(int num){
for(int i=0; i<num; i++)
System.out.println("woof ");
}
}


AIM: Write 3 programs in one package to find the area of circle,Square,Triangle.Then create another package with a single class which invoke the methods of classes defined in the first package by taking input from the user.Code:
->package shape;
import java.util.Scanner;
public class calcc{
int radius;
double area;
Scanner obj=new Scanner(System.in);
public double areac() {
System.out.println("Enter radius of circle");
radius=obj.nextInt();
area= 3.14*radius*radius;
return area;
}
}
->package shape;
import java.util.Scanner;
public class calcs{
int l,b;
double area;
Scanner obj=new Scanner(System.in);

public double areas() {
System.out.println("Enter length,breadth of square");
l=obj.nextInt();
b=obj.nextInt();
area=l*b;
return area;
}
}
->package shape;
import java.util.Scanner;
import java.lang.Math;
public class calct{
int c;
double area;
Scanner obj=new Scanner(System.in);

public double areat() {
System.out.println("Enter sides of equilateral triangle");
c=obj.nextInt();
area=(Math.sqrt(3)*c*c)/4;
return area;
}
}

->package callshape;
import shape.calcc;
import shape.calcs;
import shape.calct;

public class calls {
public static void main(String[] args)
{
calc obj=new calc();
System.out.println("Area of circle="+obj.areac());
System.out.println("Area of square="+obj.areas());
System.out.println("Area of triangle="+obj.areat());
}
}


AIM: Write a program in java to implement the concept of Exception handling by creating user-defined exception.
Code:
public class excp extends Exception {
int balance;
excp(int n)
{
balance=n;
}
public String toString()
{
return "You cannot withdraw as your current balance is less than withdraw amount";
}
static void withdraw(int b,int amount)throws excp
{
if(b<amount)
throw new excp(b);
else
{
b=b-amount;
System.out.println("Your current balance="+b);
}
}
public static void main(String[] args)
{try{
withdraw(500,1000);
}
catch(excp e)
{
System.out.println("Withdraw amount exceeds current balance:"+e);
}
}
}


AIM: Write a program in java to implement the concept of overloading and overriding.
Code:
class A
{

int oper(int a,int b)
{
return a+b;
}
void override()
{
System.out.println("This is class A");
}
}
class B extends A
{
float oper(float a,float b)
{
return a*b;
}
void override()
{ System.out.println("override successfull");

System.out.println("This is class B");

}

}
public class prac8 {
public static void main(String args[])
{
B obj=new B();
System.out.println("sum="+obj.oper(2,5));
System.out.println("multilication="+obj.oper(10f,5.3f));
obj.override();
}

}


PROGRAM : 8(b)
AIM: Write a program in java to implement the concept of final class,final method,final variable through final keyword.
Code:
final class Aero
{ void write()
{
System.out.println("Final class Aero cannot be overriden");
}
}
class Bag extends Aero
{
final void override()
{
System.out.println("Final method cannot be overriden");
}
}
class C extends Bag
{
void override()
{
System.out.println("Final method cannot be overriden");
}
}
public class use {
public static void main(String[] args)
{
final int a=5;
{
a=6;
System.out.println("Final varible which remains constant");
}
C obj=new C();
Aero an=new Aero();
an.write();
obj.override();
}
}


AIM: Write a program in java read data from file and write data in file.
Code:
import java.io.*;
public class fileh {
public static void main(String[] args) throws Exception
{
InputStreamReader f=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(f);
String name="";

System.out.println("Enter text");
name=br.readLine();
System.out.println("Name="+name);

br.close();
f.close();
File fi=new File("C:UsersShivangiDesktopcu1.txt");
FileWriter fw=new FileWriter(fi);
fw.write(name);
fw.close();
FileReader fr=new FileReader("C:UsersShivangiDesktopcu1.txt");
BufferedReader b=new BufferedReader(fr);
int i;
System.out.print("Content in file=");
while((i=b.read())!=-1)
{
System.out.print((char)i);
}
fr.close();
b.close();
}
}



AIM Write a program using JDBC to insert, create, delete and update a table.
Code:
import java.sql.*;

public class rdbc{
public static void main(String args[]) throws Exception{
//step1 load the driver class
Class.forName("oracle.jdbc.driver.OracleDriver");

//step2 create the connection object
Connection con= DriverManager.getConnection( "jdbc:oracle:thin:@localhost:1521:xe","details","7894");

//step3 create the statement object
Statement stmt=con.createStatement();

//step4 execute query
//4.1)create
String creates="create table teacher1(id int,name varchar(30),address varchar(35))";
stmt.execute(creates);
System.out.println("Created table");
//4.2)isertion
String s1="insert into teacher1 values(1,'aaa','#1')";
stmt.executeUpdate(s1);
System.out.println("Inserted");
String s2="insert into teacher1 values(2,'bbb','#2')";
stmt.executeUpdate(s2);
System.out.println("Inserted");
String s3="insert into teacher1 values(3,'ccc','#3')";
stmt.executeUpdate(s3);
System.out.println("Inserted");
String s4="insert into teacher1 values(4,'ddd','#4')";
stmt.executeUpdate(s4);
System.out.println("Inserted");
String s5="insert into teacher1 values(5,'eee','#5')";
stmt.executeUpdate(s5);
System.out.println("Inserted");
ResultSet rs = stmt.executeQuery("select * from teacher1");
while(rs.next()){
System.out.println(rs.getString(1) + " " + rs.getString(2)+" " +rs.getString(3) ); }
//4.3)updation
String k="aLTER TABLE teacher1 ADD house varchar(100)";
stmt.execute(k);
System.out.println("UPDATED");
//4.4)Deletion
String s = "DELETE FROM teacher1 WHERE id = 5";
stmt.executeUpdate(s);
System.out.println("deleted");
//4.5)display
ResultSet rs1 = stmt.executeQuery("select * from teacher1");
while(rs1.next()){
System.out.println(rs1.getString(1) + " " + rs1.getString(2)+" " +rs1.getString(3)+" " +rs1.getString(4) ); }
//step5 close the connection object
con.close();


}
}