Class:- SYIT Subject:- JDS
Class:- SYIT Subject:- JDS
PRACTICAL:- 1AIM:-Design a calculator class in Java and
implement all the methods required by calculator operations.
PROGRAM CODE:-
import java.io.*;class calculator
{
int a,b;
int ans;
public void setdata(int x,int y)
{
a=x;
b=y;
}
public void add()
{
ans=a+b;
System.out.println("ADDITION="+ans);
}
public void sub()
{
ans=a-b;
System.out.println("SUBTRACTION="+ans);
}public void mul()
{
ans=a*b;
System.out.println("MULTIPLICATION="+ans);
}
public void div()
{
ans=a/b;
System.out.println("DIVISSION="+ans);
}
}
class calcDemo
{
public static void main(String a[])
{
int x,y;
x=23;y=56;
calculator c1=new calculator();
c1.setdata(x,y);
c1.add();
c1.sub();
c1.mul();
c1.div();
}
}
OUTPUT:-
PRACTICAL:- 1AIM:- Design a Java class for method
overloading.PROGRAM CODE:-import java.io.*;class over{void area(int
a,int b){System.out.println("Area of Rectangle="+(a*b));}void
area(int a){System.out.println("Area of Square="+(a*a));}double
area(double a){double d;d=3.14*a*a;return d;}}class overDemo{public
static void main(String args[]){over o=new
over();o.area(10,20);o.area(10);double
b=o.area(3.4);System.out.println("Area of
Circle="+b);}}OUTPUT:-PRACTICAL:- 2AIM:- Design a Java program for
hybrid Inheritance and Method Overriding.PROGRAM CODE:-class
student{int roll_number;void get_number(int a){roll_number=a;}void
put_number(){System.out.println("Roll No.
:"+roll_number);}}interface test{final int nos=2;void
get_marks(double s1,double s2);}class Result extends student
implements test{double sem1,sem2;public void get_marks(double
s1,double s2){sem1=s1;sem2=s2;System.out.println("Marks Obtained
:");System.out.println("sem1 :"+sem1);System.out.println("sem2
:"+sem2);}double total,avg;void
display(){total=sem1+sem2;avg=total/nos;put_number();System.out.println("Total
Marks :"+total);System.out.println("Average :"+avg);}}class
multint{public static void main(String args[]){Result R1=new
Result();R1.get_number(123);R1.get_marks(460.5,240.5);R1.display();}}OUTPUT:-PRACTICAL:-
2AIM:- Design a Java class fot the use of interface.PROGRAM
CODE:-class student{int roll_number;void get_number(int
a){roll_number=a;}void put_number(){System.out.println("Roll No.
:"+roll_number);}}interface test{final int nos=2;void
get_marks(double s1,double s2);}class Result extends student
implements test{double sem1,sem2;public void get_marks(double
s1,double s2){sem1=s1;sem2=s2;System.out.println("Marks Obtained
:");System.out.println("sem1 :"+sem1);System.out.println("sem2
:"+sem2);}double total,avg;void
display(){total=sem1+sem2;avg=total/nos;put_number();System.out.println("Total
Marks :"+total);System.out.println("Average :"+avg);}}class
multint{public static void main(String args[]){Result R1=new
Result();R1.get_number(123);R1.get_marks(460.5,240.5);R1.display();}}OUTPUT:-PRACTICAL:-
2AIM:-Design a Java class performing string operation.PROGRAM
CODE:-import java.lang.*;class CaseDemo{public static void
main(String args[]){String s1="MAHATMA";String s2="gandhi";String
temp;temp=s1.toLowerCase();System.out.println("Original String1 is
:"+s1+"\nAfter calling toLowerCase(),String1 is:
"+temp);temp=s2.toUpperCase();System.out.println("Original String2
is :"+s2+"\nAfter calling toUpperCase(),String2 is:
"+temp);System.out.println();System.out.println("charAt");String
s="INDIA";char ch;ch=s.charAt(2);System.out.println("String is
:"+"\n Character at Index 2 is
:"+ch);System.out.println();System.out.println("compareTo and
compareToIgnoreCase");s1="computer";s2="computer";if(s1.compareTo(s2)==0)System.out.println("Strings
are equals");elseSystem.out.println("Strings are not
equal");if(s1.compareToIgnoreCase(s2)==0)System.out.println("Stringd
are equal");elseSystem.out.println("Strings are not
equal");System.out.println();System.out.println("\nConcatenated
String after calling concat()
:"+s1.concat(s2));temp=s1+s1;System.out.println("\nConcatenated
String after applying'+'operator
:"+temp);System.out.println();System.out.println("equals");s1="Java";s2=new
String(s1);System.out.println(s1+"equals"+s2+"a"+s1.equals(s2));System.out.println(s1+"=="+s2+"a"+(s1==s2));System.out.println();System.out.println("getChars(start,end,buffer,0)");s="Java
is Internet Language";int start=8;int end=16;char buffer[]=new
char[end-start];System.out.println("String is
:"+s);s.getChars(start,end,buffer,0);System.out.println("Extraxted
characters from String
:");System.out.println(buffer);System.out.println();System.out.println("indexOf");System.out.println("\nindexOf(t)="+s.indexOf('t'));System.out.println();System.out.println("length");System.out.println("Length
of String is
:"+s.length());System.out.println();System.out.println("replace");s1="Bye
Bye !!";s2=s1.replace('y','e');System.out.println("Original String
is :"+s1);System.out.println("String after calling replace()
:"+s2);System.out.println();System.out.println("substring");System.out.println("Original
String is :"+s);temp=s.substring(1,2);System.out.println("Substring
from index 12 to end of String is
:"+temp);temp=s.substring(0,5);System.out.println("Substring from
index 0 to 4 is
:"+temp);System.out.println();System.out.println("trim");s1="Mahatma
Gandhi";temp=s1.trim();System.out.println("Original String is
:"+s1);System.out.println("String after calling trim()
:"+temp);}}OUTPUT:-PRACTICAL:- 3AIM:-Design a Java class for the
use of super.PROGRAM CODE:-class CD{String title;//name of the
itemint length;//number of minutesboolean avail;//is the type in
the storeCD(CD
vt){title=vt.title;length=vt.length;avail=vt.avail;}CD(String t,int
l,boolean
a){title=t;length=l;avail=a;}CD(){title=null;length=0;avail=false;}}class
Movie extends CD{String director;//name of the directorString
rating;//G,PG,R or XMovie(Movie
m){super(m);director=m.director;rating=m.rating;}Movie(String t,int
l,boolean a,String d,String
r){super(t,l,a);director=d;rating=r;}Movie(){super();director=null;rating=null;}public
void show(){System.out.println("Title :"+title+"\nlength
:"+length+"\nAvail :"+avail);System.out.println("Director
:"+director+"\nRating :"+rating);}}class SuperObjRef{public static
void main(String args[]){Movie m=new
Movie("Jaws",120,true,"Special","PG");CD cd1=new
CD();m.show();cd1=m;//assign movie rference to CD
reference.cd1.title="Titanic";cd1.length=120;cd1.avail=true; //
cd1.director="spielberg";//illegal // cd1.rating="PG";//illegal //
cd1.show();//illegal}}OUTPUT:-PRACTICAL:- 3AIM:-Design a Java class
for implementing the Package.PROGRAM CODE:-1) L.java File:-package
p1;public class L{int a,b;public L(){a=100;b=20;}public void
add(){System.out.println("ADD="+(a+b));}public void
sub(){System.out.println("SUB="+(a-b));}public void
mul(){System.out.println("MUL="+(a*b));}public void
div(){System.out.println("DIV="+(a/b));}}2) K.java File:-import
p1.*;class K{public static void main(String args[]){L p=new
L();System.out.println("Extending
packages.........");p.add();p.sub();p.mul();p.div();}}OUTPUT:-PRACTICAL:-
4AIM:-Design a Java class for implementing the concept of
multithreading.PROGRAM CODE:-class newthread extends
Thread{newthread(){super("demo thread");System.out.println("child
thread :"+this);start();}public void run(){try{for(int
i=5;i>0;i--){System.out.println("child thread
:"+i);Thread.sleep(500);}}catch(InterruptedException
e){System.out.println("child thread
Interrupt");}System.out.println("Exiting child thread");}}class
extendthread{public static void main(String args[]){new
newthread();try{for(int i=5;i>0;i--){System.out.println("main
thread :"+i);Thread.sleep(1000);}}catch(InterruptedException
e){System.out.println("main thread
interrupt");}System.out.println("main thread
exiting");}}OUTPUT:-PRACTICAL:- 4AIM:-Design a Java class for
performing all the file input and output.PROGRAM
CODE:-1)FileInputStream :-import java.io.*;class FIS{public static
void main(String args[]) throws Exception{int size;InputStream
f=new FileInputStream("aaa.txt");System.out.println("Total Bytes :
"+(size=f.available()));System.out.println("Reading first 3
bytes");for(int i=0; i
