/* 1. Develop a program to convert the given temperature in
fahreneit to Celsius
using the following connversion formulas C = and display the
values in a
tabular
form
*Celsius.java
*Ravi 24
*20.01.12
*To convert temperature scales
*/
import
java.lang.*;
import
java.io.*;
class
Celsius
{
public static void main(String args[])
{
double c[]=new double[20];
double f[]=new double[20];
int n;
DataInputStream dis=new
DataInputStream(System.in);
try
{
System.out.println("Enter number of
values to be entered");
n=Integer.parseInt(dis.readLine());
for(int i=0;i<n;i++)
{
f[i]=Integer.parseInt(dis.readLine());
}
for(int i=0;i<n;i++)
{
c[i]=(f[i]-32)/1.8;
}
System.out.println("
farenheit-celsius");
for(int i=0;i<n;i++)
{
System.out.println(" "+f[i]+" "+c[i]);
}
}
catch(Exception e){}
}
}
/*2. Develop a program that will take a string from a command
line argument in order to check
whether it is a palindrome.
* palindrome.java
* Ravi 24
* 23/12/2011
* Checks palindrome
*/
import
java.lang.*;
import
java.io.*;
import
java.util.*;
class
palindrome
{
public static void main(String
args[])
{
boolean
flag=true;
String str;
str=args[0];
int len=
str.length();
System.out.println("Length:
"+len);
for(int
i=0;i<(len/2);i++)
{
if(str.charAt(i)==str.charAt((len-1)-i))
;
else
{ flag=false; break;}
}
if(flag==true)
System.out.println("Palindrome");
else
System.out.println("Not Palindrome");
}
}
/* 3. Develop a program by design a class to represent a bank
account. Including the following
members:
Data Members:
Name of the Depositor
Account Number
Type of account
Balance
Methods:
To assign initial values
To deposit an amount
To withdraw an amount after checking
balance
To display the name and balance
*Bank.java
*Ravi 24
*10.02.12
*Demonstration
of Bank operations
*/
import
java.lang.*;
import
java.io.*;
import
java.util.*;
class
Account
{
String name;
long accNum=1000;
int type=1;
double bal;
static int count;
}
class Bank
extends Account
{ void createAccount()
{
DataInputStream dis=new
DataInputStream(System.in);
try{
System.out.print("Enter
Name:");
name=new
String(dis.readLine());
System.out.print("\n
Account Type(1-savings/2-current:");
type=Integer.parseInt(dis.readLine());
accNum+=++count;
assignInitialValues();
}
catch(Exception e)
{
System.out.println(e);
}
}
void assignInitialValues()
{
if(type==1)
{
bal=500.0;
}
if(type==2)
{
bal=1000.0;
}
}
void withdraw(double
val)
{
if(bal>=val){bal=bal-val;}
else{
System.out.println("InSufficient Balance"); }
}
void
deposit(double val)
{
bal=bal+val;
}
void
display()
{
String
accType;
if(type==1){accType=new
String("Savings"); }
else{
accType=new String("Current"); }
System.out.println("\n\n"+accNum+"\t\t"+name+"\t\t"+accType+"\t\t"+bal);
}
public
static void main(String args[])
{
int ch=0;
double
val=0,num=0;
boolean
flag=false;
Vector v=new
Vector(10);
Bank
ob=null;
DataInputStream
dis=new DataInputStream(System.in);
try
{
loop: while(true)
{
flag=false;
System.out.println("\n
Enter 1. create 2.Credit 3.Debit 4.display 5.Exit:");
ch=Integer.parseInt(dis.readLine());
switch(ch)
{
case 1: ob=new Bank(); ob.createAccount();v.add(ob);break;
case 2:
System.out.println("\n Enter accnum:");
num=Integer.parseInt(dis.readLine());
for(int
i=0;i<v.size();i++)
{
ob=((Bank)v.get(i));
if(ob.accNum==num){flag=true;
break;}
}
if(flag)
{
System.out.println("\n
Enter amount:");
val=Integer.parseInt(dis.readLine());
ob.deposit(val);
}
else
{
System.out.println("Enter
proper AccNum");
continue loop;
}
break;
case 3:
System.out.println("\n Enter accnum:");
num=Integer.parseInt(dis.readLine());
for(int
i=0;i<v.size();i++)
{
ob=((Bank)v.get(i));
if(ob.accNum==num){flag=true;
break;}
}
if(flag)
{
System.out.println("\n
Enter amount:");
val=Integer.parseInt(dis.readLine());
ob.withdraw(val);
}
else
{
System.out.println("\n
Enter proper accnum");
continue loop;
}
break;
case 4:
System.out.println("Acc.Num Name Type BalanceAmount");
for(int
i=0;i<v.size();i++)
{
((Bank)v.get(i)).display();
}
break;
case 5: System.exit(1);
default:
System.out.println("Enter Proper Choice"); continue loop;
}
}
}
catch(Exception e)
{
System.out.println(e);
}
}
}
4. Develop a program to demonstrate multiple inheritance
through interface
import
java.lang.*;
import
java.io.*;
import
java.util.*;
interface
MyInterface
{
static final int a=20;
void display();
}
class A
{
int b=30;
}
class B
extends A implements MyInterface
{
int c;
public void display()
{
c=a+b;
System.out.println("Sum is "+c);
}
}
class
InterfaceDemo
{
public static void main(String args[])
{
B ob=new B();
ob.display();
}
}
/*5.
Develop a program to illustrate the use of multithreads
*ThreadTest.java
*Ravi 24
*02.03.12
*Demonstrating
Threads
*/
class A
extends Thread
{
public void run()
{
for(int i=1;i<=3;i++)
{
System.out.println("\tFrom ThreadA :
i= "+i);
}
System.out.println("Exit from A");
}
}
class B
extends Thread
{
public void run()
{
for(int i=1;i<=3;i++)
{
System.out.println("\tFrom ThreadB :
i= "+i);
}
System.out.println("Exit from B");
}
}
class C
extends Thread
{
public void run()
{
for(int i=1;i<=3;i++)
{
System.out.println("\tFrom ThreadC :
i= "+i);
}
System.out.println("Exit from C");
}
}
class
ThreadTest
{
public static void main(String args[])
{
A a=new A();
B b=new B();
C c=new C();
a.start();
b.start();
c.start();
}
}
6. Develop am applet that receives three numeric values as
input from the user and then display the
largest of the three.
import
java.awt.*;
import
java.applet.*;
public class
Ex1 extends Applet
{ TextField
t1,t2,t3;
public void init()
{
Label l1=new Label("first");
Label l2=new Label("second");
Label l3=new Label("third");
t1= new TextField(8);
t2= new TextField(8);
t3= new TextField(8);
t1.setText("0");
t2.setText("0");
t3.setText("0");
add(l1);
add(t1);
add(l2);
add(t2);
add(l3);
add(t3);
}
public void paint(Graphics g)
{
g.drawString("input the
num",10,45);
int x=0,y=0,z=0,max=0;
String s1,s2,s3,s;
try{
s1=t1.getText();
s2=t2.getText();
s3=t3.getText();
x=Integer.parseInt(s1);
y=Integer.parseInt(s2);
z=Integer.parseInt(s3);
}
catch(Exception e)
{}
if(x>y&&x>z)
max=x;
else if(y>x&&y>z)
max=y;
else
max=z;
s=String.valueOf(max);
g.drawString("the max num is
"+s,20,55);
}
public boolean action(Event event,Object
object)
{
repaint();
return true;
}
}
7.
Develop an applet that displays different bar charts
import
java.awt.*;
import
java.applet.*;
public class
BarChart extends Applet
{
int n=0;
String
label[]={"91","92","93","94"};
int value[]={110,150,100,170};
public void paint(Graphics g)
{
for(int i=0;i<4;i++)
{
g.setColor(Color.red);
g.drawString(label[i],20,i*50+30);
g.fillRect(50,i*50+10,value[i],40);
}
}
}
/*
7.
Develop an applet that displays different bar charts
*graphs.java
*Ravi 24
*16.03.12
*To display IND-SL scores in BarGraphs
*/
import
java.lang.*;
import
java.io.*;
import
java.awt.*;
import
java.applet.*;
public class
graphs extends Applet
{
int
sri[]={3,3,1,4,6,2,9,1,0,3,8,7,8,3,5,1,10,2,3,0,5,8,2,5,6,11,3,7,7,4,5,6,4,5,11,4,3,6,3,2,2,1,2,4,3,9,4,9,12,4};
int
ind[]={2,4,7,6,4,1,2,8,8,2,3,2,7,5,7,5,6,0,3,1,10,1,3,5,1,6,5,8,4,9,2,3,3,4,8,2,5,7,4,5,0,2,2,4,5,13,5,4,15,4};
public void init()
{
}
public void
paint(Graphics g)
{
try
{
int
j=-10;
g.setColor(Color.black);
g.drawLine(0,200,
1000,200);
g.setColor(Color.red);
g.drawString("SRI
LANKA:",20,30);
g.setColor(Color.blue);
g.drawString("INDIA:",20,330);
for(int
i=0;i<50;i++)
{
g.setColor(Color.red);
g.fillRect(j+10,200-(sri[i]*10),10,sri[i]*10);
j+=20;
}
j=-10;
for(int
i=0;i<50;i++)
{
g.setColor(Color.blue);
g.fillRect(j+10,200,10,ind[i]*10);
j+=20;
}
}catch(Exception
e){}
}
}
/*
8. Develop an applet to draw the following shapes
a) Cone
b) Cylinder
c) Cube
d) Square inside a circle e) Circle inside a square
*/
import
java.applet.*;
import
java.awt.*;
public class
Shapes extends Applet
{
public void paint(Graphics g)
{
int c=100,d=100;//to draw cone
g.drawOval(c,d,50,25);
g.drawLine(c,d+10,c+25,d+100);
g.drawLine(c+50,d+10,c+25,d+100);
c=300;d=300;//to draw cylinder
g.drawOval(c,d,50,25);
g.drawOval(c,d+100,50,25);
g.drawLine(c,d+10,c,d+110);
g.drawLine(c+50,d+10,c+50,d+110);
c=200;d=200;//cube
g.drawLine(c,d,c+50,d);
g.drawLine(c,d+50,c+50,d+50);
g.drawLine(c,d,c,d+50);
g.drawLine(c+50,d,c+50,d+50);
g.drawLine(c+20,d-20,c+70,d-20);
g.drawLine(c+20,d+30,c+70,d+30);
g.drawLine(c+20,d-20,c+20,d+30);
g.drawLine(c+70,d-20,c+70,d+30);
g.drawLine(c,d,c+20,d-20);
g.drawLine(c+50,d,c+70,d-20);
g.drawLine(c,d+50,c+20,d+30);
g.drawLine(c+50,d+50,c+70,d+30);
c=500;d=200;//circle inside
square
g.drawLine(c,d,c+100,d);
g.drawLine(c,d+100,c+100,d+100);
g.drawLine(c,d,c,d+100);
g.drawLine(c+100,d,c+100,d+100);
g.drawOval(c,d,100,100);
c=600;d=100;//square inside
circle
g.drawOval(c,d,100,100);
g.drawLine(c+15,d+15,c+85,d+15);
g.drawLine(c+15,d+85,c+85,d+85);
g.drawLine(c+15,d+15,c+15,d+85);
g.drawLine(c+85,d+15,c+85,d+85);
}
}
9. Develop a program to display a calendar for a specified
month using the Date, Calendar and Date
Format
classes.
*MyCalendar.java
*Jagadeesh,10
*31-03-2012
*To print
the calendar of a month
*/
import
java.util.*;
public class
MyCalendar
{
public static void main(String
args[])
{
int
m=Integer.parseInt(args[0]);
int
y=Integer.parseInt(args[1]);
Date dt=new Date(y-1900,m-1,1);
int NumDays=31,
count=0;
String Month[]=
{"JANUARY","FEBRUARY","MARCH",
"APRIL","MAY",
"JUNE","JULY","AUGUST","SEPTEMBER","OCTOBER","NOVEMBER","DECEMBER"};
if((m==4)||(m==6)||(m==9)||(m==11)){
NumDays=30; }
if(m==2){
NumDays=28; if((y%400==0)||((y%4==0)&&(y%100!=0))){ NumDays=29;}}
int
day=dt.getDay();
System.out.println("\n\n\t\t"+Month[m-1]+"\t"+y+"\n\n");
System.out.println(" SUN\t
MON\t TUE\t WED\t
THU\t FRI\t SAT");
for(int
i=0;i<day;i++){ System.out.print("\t"); count++;}
for(int
k=1;k<=NumDays;k++){
if(count==6){System.out.print(" "+k+"\t");
System.out.println("");count=0;}
else {
System.out.print("
"+k+"\t"); count++;}
}
}
}
/*
10. Develop a program for handling Mouse Events.
MyMouseEvent.java
*Ravi 24
*09.04.12
*Demonstrating Mouse events to tell when when
mouse enters
*/
import
java.awt.*;
import
java.awt.event.*;
public class
MyMouseEvent extends Frame implements MouseListener{
static Frame f;
MyMouseEvent()
{
f=new Frame("FIRST CSE");
f.addMouseListener(this);
}
public static void main(String
args[])
{
MyMouseEvent
m=new MyMouseEvent();
f.setBounds(100,
100, 600, 200);
f.setVisible(true);
}
public void
mouseClicked(MouseEvent e){ System.out.println("mouseClicked");}
public void
mouseEntered(MouseEvent e){System.out.println("mouseEntered");}
public void
mouseExited(MouseEvent e){System.out.println("mouseExited");}
public void
mousePressed(MouseEvent e){ System.out.println("mousePressed");}
public void
mouseReleased(MouseEvent e){System.out.println(" mouseReleased"); }
//public void
windowActivated(WindowEvent e){System.out.println("Window
activated");}
//public void
windowDeactivated(WindowEvent e){System.out.println("Window
Deactived"); }
}
/*
11.
Develop a program to display the mouse position when the mouse is pressed. MyMouseEvents2.java
*Ravi 24
*09.04.12
*Demonstrating mouse events to give the
coordinates
*/
import
java.applet.*;
import
java.awt.*;
import
java.awt.event.*;
public class
MyMouseEvents2 extends Applet implements MouseListener{
int x=0,y=0;
public void init()
{
addMouseListener(this);
}
public void paint(Graphics g)
{
g.drawString("("+x+","+y+")",
x,y);
}
public void mouseClicked(MouseEvent e){
x = e.getX();
y = e.getY();
repaint();
//g.drawString("cordinate
of x"+x+"cordinate of y"+y);
}
public void
mouseEntered(MouseEvent e){
x = e.getX();
y = e.getY();
repaint(); //System.out.println("mouseEntered");
}
public void
mouseExited(MouseEvent e){
x = e.getX();
y = e.getY();
repaint();//System.out.println("mouseExited");
}
public void
mousePressed(MouseEvent e){
x = e.getX();
y = e.getY();
repaint(); //System.out.println("mousePressed");
}
public void
mouseReleased(MouseEvent e){
x = e.getX();
y = e.getY();
repaint();
}
//public void
windowActivated(WindowEvent e){System.out.println("Window
activated");}
//public void
windowDeactivated(WindowEvent e){System.out.println("Window
Deactived"); }
}
/* 12. Develop a program to meet the following requirements
(a) Create a frame with flow layout
(b) Create two panels and add the panels to the frame
(c) Each panel contains three buttons. The panel uses flow
layout
*Layout1.java
*Jagadeesh,10
*30-03-2012
*To create 2
panels each with 3 buttons and add them to a frame
*/
import
java.awt.*;
import
java.lang.*;
import
java.applet.*;
public class
Layout1
{
static Frame
f=new Frame("FIRST CSE");
public static void main(String args[])
{
Container con=f;
f.setBounds(100,100,600,200);
Panel p1=new Panel(new FlowLayout());
p1.setLayout(new FlowLayout());
p1.add(new Button("One"));
p1.add(new Button("Two"));
p1.add(new Button("Three"));
f.setLayout(new BorderLayout());
con.add(p1,BorderLayout.NORTH);
Panel p2=new Panel(new FlowLayout());
p2.setLayout(new FlowLayout());
p2.add(new Button("Four"));
p2.add(new Button("Five"));
p2.add(new Button("Six"));
con.add(p2,BorderLayout.SOUTH);
f.setVisible(true);
}
}
/* 13. Develop a program to calculate the future value of an
investment at a given interest rate for a
specified number of years. The formula for the calculation is
as follows:
Future value = Investment Amount (1+ Interest Rate) years.
*Bank.java
*Ravi 24
*09.04.12
*Interactive
input to an applet and Item Event
*/
import
java.awt.*;
import
java.applet.*;
import
java.awt.event.*;
public class
Bank extends Applet implements ItemListener
{
TextField text1,
text2,text3,text4;
int amt=0, years=0,
rate=0,futval=0;
//String result="";
public void init()
{
Label lob1=new
Label();
Label lob2=new
Label();
Label lob3=new
Label();
Label lob4=new
Label();
lob1.setText("Amount");
lob2.setText("Years");
lob3.setText("Rate");
lob4.setText("Future
Value");
text1=new
TextField(8);
text2=new
TextField(8);
text3=new
TextField(8);
text4=new
TextField(8);
add(lob1);
add (text1);
add(lob2);
add (text2);
add(lob3);
add (text3);
add(lob4);
add (text4);
text1.setText
("0");
text2.setText
("0");
text3.setText
("0");
text4.setText
("0");
List lt=new
List(1,false);
lt.add("Calculate");
lt.addItemListener(this);
add(lt);
}
public void paint(Graphics g)
{
//g.drawString("Result
is : "+z,25, 75);
//s=text2.getText();
//=
Integer.parseInt(s2);
}
public void
itemStateChanged(ItemEvent event)
{
String s1=null, s2=null,s3=null;
try
{
s1=text1.getText();
amt=
Integer.parseInt(s1);
s2=text2.getText();
years=
Integer.parseInt(s2);
s3=text3.getText();
rate=
Integer.parseInt(s3);
//s=text2.getText();
//=
Integer.parseInt(s2);
}
catch (Exception
ex) { System.out.println(ex);}
if(event.getStateChange()==ItemEvent.SELECTED)
{
String s=null;
int
i=(Integer)event.getItem();
List
ob=(List) event.getItemSelectable();
if(ob.getItem(i)=="Calculate"){
futval=amt*((1+rate)*years); }
/*if(ob.getItem(i)=="SUB"){
z=x-y;}
if(ob.getItem(i)=="MUL"){
z=x*y; }
if(ob.getItem(i)=="DIV"){
if(y!=0){ z=x/y; }}*/
s=String.valueOf(futval);
text4.setText(s);
}
repaint();
}
}
