Java practical N Scheme Diploma in Computer Engineering

1
Java practical N Scheme Experiments
Java programming path setting
➢ Open Notepad type the java program.
➢ Save the program using Filename .java
➢ Open command Prompt
➢ Set the path.
➢ Compile java program using the command javac filename.java
➢ Run the Program using the command java file name
➢ Give the inputs and verify the outputs

2
Ex:No-1 CONVERT CELSIUS TO FAHRENHEIT
Aim:
Procedure:
* Open the notepad.
* Type the Program and save “ filename.java ”
* Open the Command Prompt and set path.
* Compile the Program using javac.
* Run the Program using Interpreter.
* Stop the Program.
Program:
import java.io.*;
class nex1
{
public static void main(String str[])
{
float f,fahren,celsius;
celsius=24;
fahren=((celsius*9)/5)+32;
System.out.println("Temperature in fahrenheit :"+fahren);
}
}
Output:
Result:

3
EX:N0-2 FIND LARGEST NUMBER
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.*;
class nex2
{
public static void main(String str[])throws IOException
{
int a,b;
InputStreamReader isr=new InputStreamReader(System.in);
BufferedReader br=new BufferedReader(isr);
String s1=br.readLine();
a=Integer.parseInt(s1);
b=Integer.parseInt(s2);
if(a>b)
{
System.out.println("a is greater");
}
else
{
System.out.println("b is greater");
}
}
}

5
EX:No-3 FACTORIAL NUMBERS
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.*;
class nex3
{
{
int n,i,fact;
n=Integer.parseInt(s1);
fact=1;
for(i=1;i<=n;i++)
{
fact=fact*i;
System.out.println("Factorial:t"+fact);
}
}
}

7
EX:No-4 VECTOR CLASS AND METHODS
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.*;
import java.util.*;
public class vec4
{
public static void main(String args[])throws IOException
{
int len,cap;
Vector<String> vec = new Vector<String>();
System.out.println("Enter Add Elementsn");
vec.add("Tiger");
vec.add("Lion");
vec.add("Dog");
vec.add("Elephant");
len=vec.size();
System.out.println("SIZE:t"+len);
cap=vec.capacity();
System.out.println("CAPACITY:t"+cap);
vec.addElement("Rat");
vec.addElement("Cat");
vec.addElement("Deer");
System.out.println("Elements are: "+vec);
len=vec.size();
System.out.println("SIZE:t"+len);
cap=vec.capacity();
System.out.println("CAPACITY:t"+cap);
}
}

9
EX:No-5 PALINDROME OR NOT
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.*;
class nex5
{
{
int strln;
s1="amma";
String s2="";
strln=s1.length();
for(int i=(strln-1);i>=0;--i)
{
s2=s2+s1.charAt(i);
}
if(s1.toLowerCase().equals(s2.toLowerCase()))
{
System.out.println("tis a palindrome");
}
else
{
System.out.println("tis not palindrome");
}
}
}

11
EX:No-6 STUDENT MARKSHEET USING CONSTRUCTOR
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.*;
import java.util.Scanner;
public class Student
{
private String name;
private int eng;
private int hn;
private int mts;
private double total;
private double avg;
public void accept()
{
Scanner in = new Scanner(System.in);
System.out.print("Enter student name: ");
name = in.nextLine();
System.out.print("Enter marks in English: ");
eng = in.nextInt();
System.out.print("Enter marks in Hindi: ");
hn = in.nextInt();
System.out.print("Enter marks in Maths: ");
mts = in.nextInt();
}
public void compute()
{
total = eng + hn + mts;
avg = total / 3.0;
}

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public void display()
{
System.out.println("Name: " + name);
System.out.println("Marks in English: " + eng);
System.out.println("Marks in Hindi: " + hn);
System.out.println("Marks in Maths: " + mts);
System.out.println("Total Marks: " + total);
System.out.println("Average Marks: " + avg);
}
public static void main(String args[])
{
Student ss = new Student();
ss.accept();
ss.compute();
ss.display();
}
}
Output:
Result:

13
EX:No-7 DISPLAY RADIUS OF A CIRCLE USING COMMAND LINE
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.*;
class nex7
{
{
double radius=Double.parseDouble(args[0]);
System.out.println("Area: "+(22/7 * radius * radius));
System.out.println("Perimeter: "+(2 * 22/7 * radius));
}
}
Output:
Result:

14
EX:No-8 MULTI LEVEL INHERITANCE
Aim :
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.*;
class add
{
void addition()
{
int a=10;
int b=6;
int x=a+b;
System.out.println("Addition:t"+x);
}
}
class sub extends add
{
void subtraction()
{
int m=15;
int n=7;
int k=m-n;
System.out.println("Subtraction:t"+k);
}
}
class nex8
{
{

15
sub s1=new sub();
s1.addition();
s1.subtraction();
}
}
Output:
Result:

16
EX:No-9 EXCEPTION CLASS
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.*;
class nex9
{
{
int a,b,c;
a=Integer.parseInt(s1);
b=Integer.parseInt(s2);
c=Integer.parseInt(s3);
try
{
if(b==0)
{
ArithmeticException a1=new ArithmeticException();
throw a1;
}
else
{
int d=a+b/c;
System.out.println(d);
}
}

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catch(ArithmeticException e)
{
System.out.println(e);
}
System.out.println("Welcome to Java");
}
}
Output:
Result:

18
EX:No-10 THREAD
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.*;
class thr1 extends Thread
{
public void run()
{
for(int i=0;i<=5;i++)
{
System.out.println("Good Morning");
}
}
}
{
public void run()
{
{
System.out.println("Hello");
}
}
}
{
public void run()
{
{
System.out.println("Welcome");
}
}
}

19
class nex10
{
{
thr1 t1=new thr1();
thr2 t2=new thr2();
thr3 t3=new thr3();
t1.start();
t2.start();
t3.start();
}
}
Output:
Result:

20
EX:No-11 BYTE STREAM CLASS
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.io.FileOutputStream;
import java.io.IOException;
class nex11
{
{
try
{
FileOutputStream fout=new FileOutputStream("ja.txt");
String s= "Welcome to JAVA!";
byte b[] = s.getBytes();
fout.write(b);
fout.close();
}
catch (IOException e)
{
System.out.println(e);
}
}
}

22
EX:No-12 MOUSE EVENT
Aim:
Procedure:
* Open the notepad.
* Run the Program using appletviewer browser (“appletviewer filename.java”).
* Applet window will be opened.
* The output also displayed on the applet window.
* Stop the Program.
Program:
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class nex12 extends Applet implements MouseListener,
MouseMotionListener
{
String message = "";
public void init()
{
setBackground(Color.YELLOW);
addMouseListener(this);
addMouseMotionListener(this);
}
public void paint(Graphics g)
{
g.drawString(message, 50, 50);
}
public void mouseEntered(MouseEvent me)
{
setBackground(Color.PINK);
message = "Mouse Entered: (" + me.getX() + ", " + me.getY() + ")";
repaint();
}
public void mouseExited(MouseEvent me)
{

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setBackground(Color.RED);
message = "Mouse Exited: (" + me.getX() + ", " + me.getY() + ")";
repaint();
}
public void mouseClicked(MouseEvent me)
{
setBackground(Color.CYAN);
message = "Mouse Clicked: (" + me.getX() + ", " + me.getY() + ")";
repaint();
}
public void mousePressed(MouseEvent me)
{
setBackground(Color.MAGENTA);
message = "Mouse Pressed: (" + me.getX() + ", " + me.getY() + ")";
repaint();
}
public void mouseReleased(MouseEvent me)
{
setBackground(Color.GREEN);
message = "Mouse Released: (" + me.getX() + ", " + me.getY() + ")";
repaint();
}
public void mouseMoved(MouseEvent me)
{
setBackground(Color.ORANGE);
message = "Mouse Moved: (" + me.getX() + ", " + me.getY() + ")";
repaint();
}
public void mouseDragged(MouseEvent me)
{
setBackground(Color.GRAY);
message = "Mouse Dragged: (" + me.getX() + ", " + me.getY() + ")";
repaint();
}
}
/*<APPLET CODE="nex12.class" WIDTH="300" HEIGHT="300">
</APPLET>*/

25
EX:No-13 DISPLAY BASIC SHAPES
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.awt.*;
public class nex13 extends Applet
{
public void paint(Graphics g)
{
g.drawOval(50,50,75,75);
g.drawRect(130,130,100,100);
g.drawRoundRect(200,250,150,150,50,50);
g.drawArc(280,280,300,290,0,90);
g.drawOval(400,150,80,120);
Color c1=new Color(0,255,0);
g.setColor(c1);
g.fillOval(50,50,75,75);
g.fillRect(130,130,100,100);
g.fillRoundRect(200,250,150,150,50,50);
g.fillArc(280,280,300,290,0,90);
g.fillOval(400,150,80,120);
}
}
/*<applet code="nex13.class" width=800 height=800>
</applet>*/

27
EX:No-14 CALCULATOR
Aim:
Procedure:
* Open the notepad.
* Stop the Program.
Program:
import java.awt.*;
import java.awt.event.*;
public class nex14 extends Applet implements ActionListener
{
Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;
String s1="",s2;
Frame f;Panel p2;
TextField t;int n1,n2;
public void init()
{
setLayout(new BorderLayout());
t=new TextField();
p2=new Panel();
p2.setLayout(new GridLayout(4,4));
b1=new Button("1"); b1.addActionListener(this);
b4=new Button("+"); b4.addActionListener(this);

28
b8=new Button("-"); b8.addActionListener(this);
b12=new Button("*"); b12.addActionListener(this);
b13=new Button("c"); b13.addActionListener(this);
b15=new Button("/"); b15.addActionListener(this);
b16=new Button("="); b16.addActionListener(this);
add(t,"North");
p2.add(b1);p2.add(b2);p2.add(b3);p2.add(b4);
add(p2);
}
public void actionPerformed(ActionEvent e1)
{
String str=e1.getActionCommand();
if(str.equals("+")||str.equals("-")||str.equals("*")||str.equals("/"))
{
String str1=t.getText();
s2=str;
n1=Integer.parseInt(str1);
s1="";
}
else if(str.equals("="))
{
String str2=t.getText();
n2=Integer.parseInt(str2);
int sum=0;
if(s2=="+")
sum=n1+n2;
else if(s2=="-")
sum=n1-n2;
else if(s2=="*")
sum=n1*n2;
else if(s2=="/")
sum=n1/n2;
String str1=String.valueOf(sum);
t.setText(""+str1);
s1="";
}

29
else if(str.equals("c"))
{
t.setText("");
}
else
{
s1+=str;
t.setText(""+s1);
}
}
}
/*<applet code="nex14.class" height=300 width=300>
</applet>*/
Output:
Result:-

Java practical N Scheme Diploma in Computer Engineering

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