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Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
Java practical
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Java practical

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  • 1. 1. Program to generate Fibonacci series import java.io.*; import java.util.*; public class Fibonacci { public static void main(String[] args) { DataInputStream reader = new DataInputStream((System.in)); int f1=0,f2=0,f3=1; try { System.out.print("Enter value of n: "); String st = reader.readLine(); int num = Integer.parseInt(st); for(int i=1;i<=num;i++) { System.out.println("tt"+f3+"tnt"); f1=f2; f2=f3; f3=f1+f2; } } catch(Exception e) { System.out.println("wrong input"); } } }2. Program to take two numbers as input from command line interface and display their sum
  • 2. Coding: class Sum { public void add(int a,int b) { int c; c=a+b; System.out.print("tttnnThe sum of two no is = "+c); System.out.println("nnn"); } } class SMain { public static void main(String arg[]) { Sum obj1=new Sum(); int x,y; String s1,s2; s1=arg[0]; s2=arg[1]; x=Integer.parseInt(s1); y=Integer.parseInt(s2); obj1.add(x,y); } }3. Use of array in javaCoding:class Person{String name[];int age[];}
  • 3. class PersonMain{public static void main(String arg[]){Person obj=new Person();obj.name=new String[6];obj.age=new int[6];obj.name[0]="Neha";obj.age[0]=19;obj.name[1]="manpreet";obj.age[1]=19;obj.name[2]="rahul";obj.age[2]=23;obj.name[3]="yuvraj";obj.age[3]=12;obj.name[4]="kombe";obj.age[4]=19;obj.name[5]="tony";obj.age[5]=19;
  • 4. for(int i=0;i<4;i++)System.out.println(obj.name[i]);{for(int j=0;j<4;j++)System.out.println(obj.age[j]);}}}4. Create a class customer having three attributes name, bill and id. Include appropriate methods for taking input from customer and displaying its valuesCoding: import java.io.DataInputStream;class Customer{public static void main(String arf[]){DataInputStream myinput=new DataInputStream(System.in);String name; int bill=0,id=0;try{System.out.println("enter name of customer");name=myinput.readLine();System.out.println("enter bill");bill=Integer.parseInt(myinput.readLine());System.out.println("enter id");id=Integer.parseInt(myinput.readLine());
  • 5. System.out.println("name of customer is"+name);System.out.println("bill of customer"+bill);System.out.println("id of customer"+id);}catch(Exception e){System.out.println("wrong input error!!!");}}}5. To show the concept of method overloading Coding: class Addition//FUNCTION OVERLOADING { public int add(int a,int b) { int c=a+b; return (c); } public float add(float a,float b) { float c=a+b; return (c);
  • 6. } public double add(double a,double b) { double c=a+b; return (c); } } class AddMain { public static void main(String arg[]) { Addition obj=new Addition(); System.out.println(obj.add(20,30)); System.out.println(obj.add(100.44f,20.54f)); System.out.println(obj.add(1380.544,473.56784)); } }6. To count no. of object created of a class class Demo//OBJECT CREATION { private static int count=0; public Demo()
  • 7. { System.out.println("i am from demo"); count++; System.out.println("object created is"+count); } } class DemoMains { public static void main(String args[]) { Demo obj1=new Demo(); Demo obj2=new Demo(); Demo obj3=new Demo(); } }7. To show concept of multilevel inheritance Coding: class A { private int num1,num2,sum; public void set(int x,int y) {
  • 8. num1=x;num2=y;sum=num1+num2;}public int get1(){return(sum);}}class B extends A{public void display(){System.out.println("sum of two numbers is"+get1());}}class C extends B{private double sqr;public void sqrs(){sqr=java.lang.Math.sqrt(get1());System.out.println("square root of sum is"+sqr);}}class ABCMain{public static void main(String args[]){C obj1=new C();obj1.set(100,200);System.out.println("first number is 100");System.out.println("second number is 200");obj1.display();obj1.sqrs();}}
  • 9. 8. To show concept of method overridingCoding:class Demo{private static int count=0;public Demo(){System.out.println("i am from demo");count++;System.out.println("object created is"+count);}public String toString(){return("method overridding");}}class MethodOverride{public static void main(String args[]){Demo obj1=new Demo();Demo obj2=new Demo();Demo obj3=new Demo();
  • 10. System.out.println("overriding toString methodnnttoverriden message=: "+obj1.toString());}} 9. Create a class that will at least import two packages and use the method defined in the classes of those packages. Coding: MyApplet.java: import java.awt.*; import java.applet.*; public class MyApplet extends Applet { public void paint(Graphics g) { g.drawLine(400,100,100,400); } } Ex1.html: <applet code="MyApplet.class" height="600" width="800" > </applet>
  • 11. 10. To create thread by extending thread class Coding: class T1 extends Thread { public void run() { for(int i=0;i<5;i++) { System.out.println("thread 1 created"); } } } class T2 extends Thread { public void run() { for(int i=0;i<5;i++) { System.out.println("thread 2 created"); } } } class TMain { public static void main(String arg[]) { T1 obj1=new T1(); obj1.start(); T2 obj2=new T2(); obj2.start(); } }
  • 12. 11. Create thread by implementing runnable interface Coding: class T1 implements Runnable { public void run() { for(int i=0;i<5;i++) { System.out.println("thread 1 created"); } } } class T2 implements Runnable { public void run() { for(int i=0;i<5;i++) { System.out.println("thread 2 created"); } } } class RMain { public static void main(String arg[]) { T1 obj1=new T1(); Thread t1=new Thread(obj1); T2 obj2=new T2(); Thread t2=new Thread(obj2); t1.start(); t2.start();
  • 13. } }12. To create user defined exception class InvalidRollno extends Exception { String msg; public InvalidRollno() { } public InvalidRollno(String m) { msg=m; } public String toString() { return(msg); } }
  • 14. class Student{private int rollno;public void setStudent(int r) throws InvalidRollno{rollno=r;if(r<1){throw new InvalidRollno("invalid rollno");}}}class SMain{public static void main(String agf[]){Student obj1=new Student();try{obj1.setStudent(-11);}catch(InvalidRollno e){System.out.println(e);}
  • 15. } }13. Program for showing the concept of sleep method in multithreading. public class DelayExample{ public static void main(String[] args){ System.out.println("Hi"); for (int i = 0; i < 10; i++) { System.out.println("Number of itartion = " + i); System.out.println("Wait:"); try {
  • 16. Thread.sleep(4000); }catch (InterruptedException ie) { System.out.println(ie.getMessage());}}}14. Program to demonstrate a basic applet.import java.awt.*;import java.applet.*;/*<applet code="sim" width=300 height=300></applet>*/public class sim extends Applet{String msg=" ";public void init()
  • 17. {msg+="init()--->";setBackground(Color.orange);}public void start(){msg+="start()--->";setForeground(Color.blue);}public void paint(Graphics g){msg+="paint()--->";g.drawString(msg,200,50);}}15. Program for drawing various shapes on applets.import java.awt.*;import java.applet.*;/*
  • 18. <applet code="Sujith" width=200 height=200></applet>*/public class Sujith extends Applet{public void paint(Graphics g){for(int i=0;i<=250;i++){Color c1=new Color(35-i,55-i,110-i);g.setColor(c1);g.drawRect(250+i,250+i,100+i,100+i);g.drawOval(100+i,100+i,50+i,50+i);g.drawLine(50+i,20+i,10+i,10+i);}}}
  • 19. 16. Program for filling various objects with colours.import java.awt.*;public class GradientPaintExample extends ShapeExample {private GradientPaint gradient =new GradientPaint(0, 0, Color.red, 175, 175, Color.yellow,true);public void paintComponent(Graphics g){clear(g)Graphics2D g2d = (Graphics2D)g;drawGradientCircle(g2d);}protected void drawGradientCircle(Graphics2D g2d)
  • 20. g2d.setPaint(gradient);g2d.fill(getCircle());g2d.setPaint(Color.black);g2d.draw(getCircle()); }public static void main(String[] args) {WindowUtilities.openInJFrame(new GradientPaintExample(),380, 400); }17. Program of an applet which respond to mouse motion listener interface method.import javax.swing.*;import java.awt.Color;
  • 21. import java.awt.FlowLayout;import java.awt.Graphics;import java.awt.Container;import java.awt.event.*;public class MovingMessage{public static void main (String[] s){ HelloJava f = new HelloJava();}}class HelloJava extends JFrame implements MouseMotionListener, ActionListener{int messageX = 25, messageY = 100;String theMessage;JButton theButton;int colorIndex = 0;static Color[] someColors = { Color.black, Color.red,Color.green, Color.blue, Color.magenta };HelloJava(){theMessage = "Dragging Message";setSize(300, 200);Container contentPane = getContentPane();contentPane.setLayout(new FlowLayout());theButton = new JButton("Change Color");contentPane.add(theButton);theButton.addActionListener(this);
  • 22. addMouseMotionListener(this);setVisible(true);}private void changeColor(){if (++colorIndex == someColors.length)colorIndex = 0;setForeground(currentColor());repaint();}private Color currentColor(){ return someColors[colorIndex]; }public void paint(Graphics g){super.paint(g);g.drawString(theMessage, messageX, messageY);}public void mouseDragged(MouseEvent e){messageX = e.getX();messageY = e.getY();repaint();}public void mouseMoved(MouseEvent e) { }public void actionPerformed(ActionEvent e)
  • 23. {if (e.getSource() == theButton)changeColor();}}18. Program of an applet which uses the various methods defined in the key listenerinterface.import java.awt.*;import java.awt.event.*;public class KeyListenerTester extends Frame implements KeyListener{TextField t1;Label l1;public KeyListenerTester(String s ) {super(s);Panel p =new Panel();l1 = new Label ("Key Listener!" ) ;p.add(l1);add(p);addKeyListener ( this ) ;
  • 24. setSize ( 200,100 );setVisible(true);addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}public void keyTyped ( KeyEvent e ){l1.setText("Key Typed");}public void keyPressed ( KeyEvent e){l1.setText ( "Key Pressed" ) ;}public void keyReleased ( KeyEvent e ){l1.setText( "Key Released" ) ;}public static void main (String[]args ){new KeyListenerTester ( "Key Listener Tester" ) ;}}
  • 25. 19. program to change the background colour of applet by clicking on command button.import java.applet.Applet;import java.awt.Button;import java.awt.Color;public class ChangeButtonBackgroundExample extends Applet{public void init(){Button button1 = new Button("Button 1");Button button2 = new Button("Button 2");button1.setBackground(Color.red);button2.setBackground(Color.green);add(button1);add(button2);}}
  • 26. 20. Program of an applet that will demonstrate a basic calculator.import java.awt.*;import java.awt.event.*;import javax.swing.*;import javax.swing.event.*;class Calculator extends JFrame {private final Font BIGGER_FONT = new Font("monspaced",Font.PLAIN, 20);private JTextField textfield;private boolean number = true;private String equalOp = "=";private CalculatorOp op = new CalculatorOp();public Calculator() {textfield = new JTextField("0", 12);textfield.setHorizontalAlignment(JTextField.RIGHT);
  • 27. textfield.setFont(BIGGER_FONT);ActionListener numberListener = new NumberListener();String buttonOrder = "1234567890 ";JPanel buttonPanel = new JPanel();buttonPanel.setLayout(new GridLayout(4, 4, 4, 4));for (int i = 0; i < buttonOrder.length(); i++) {String key = buttonOrder.substring(i, i+1);if (key.equals(" ")) {buttonPanel.add(new JLabel(""));} else {JButton button = new JButton(key);button.addActionListener(numberListener);button.setFont(BIGGER_FONT);buttonPanel.add(button);}}ActionListener operatorListener = new OperatorListener();JPanel panel = new JPanel();panel.setLayout(new GridLayout(4, 4, 4, 4));String[] opOrder = {"+", "-", "*", "/","=","C"};for (int i = 0; i < opOrder.length; i++) {JButton button = new JButton(opOrder[i]);button.addActionListener(operatorListener);button.setFont(BIGGER_FONT);panel.add(button);
  • 28. }JPanel pan = new JPanel();pan.setLayout(new BorderLayout(4, 4));pan.add(textfield, BorderLayout.NORTH );pan.add(buttonPanel , BorderLayout.CENTER);pan.add(panel , BorderLayout.EAST );this.setContentPane(pan);this.pack();this.setTitle("Calculator");this.setResizable(false);}private void action() {number = true;textfield.setText("0");equalOp = "=";op.setTotal("0");}class OperatorListener implements ActionListener {public void actionPerformed(ActionEvent e) {if (number) {action();textfield.setText("0");} else {number = true;String displayText = textfield.getText();
  • 29. if (equalOp.equals("=")) {op.setTotal(displayText);} else if (equalOp.equals("+")) {op.add(displayText);} else if (equalOp.equals("-")) {op.subtract(displayText);} else if (equalOp.equals("*")) {op.multiply(displayText);} else if (equalOp.equals("/")) {op.divide(displayText);}textfield.setText("" + op.getTotalString());equalOp = e.getActionCommand();}}}class NumberListener implements ActionListener {public void actionPerformed(ActionEvent event) {String digit = event.getActionCommand();if (number) {textfield.setText(digit);number = false;} else {textfield.setText(textfield.getText() + digit);}
  • 30. }}public class CalculatorOp {private int total;public CalculatorOp() {total = 0;}public String getTotalString() {return ""+total;}public void setTotal(String n) {total = convertToNumber(n);}public void add(String n) {total += convertToNumber(n);}public void subtract(String n) {total -= convertToNumber(n);}public void multiply(String n) {total *= convertToNumber(n);}public void divide(String n) {total /= convertToNumber(n);}
  • 31. private int convertToNumber(String n) {return Integer.parseInt(n);}}}21. Program for showing the use of various method of URL class.import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.net.MalformedURLException;import java.net.URL;public class GetURL {static protected void getURL(String u) {URL url;InputStream is;InputStreamReader isr;BufferedReader r;
  • 32. String str;try {System.out.println("Reading URL: " + u);url = new URL(u);is = url.openStream();isr = new InputStreamReader(is);r = new BufferedReader(isr);do {str = r.readLine();if (str != null)System.out.println(str);} while (str != null);} catch (MalformedURLException e) {System.out.println("Must enter a valid URL");} catch (IOException e) {System.out.println("Can not connect");}}static public void main(String args[]) {if (args.length < 1)System.out.println("Usage: GetURL ");elsegetURL(args[0]);}}
  • 33. 22. Program to print concentric circlesimport java.awt.*;import java.applet.*;import java.util.*;public class c_cir extends Applet{public void paint(Graphics g){Random rg = new Random();for (int i=1; i<=3; i++){int r = rg.nextInt(255);int gr = rg.nextInt(255);int b = rg.nextInt(255);Color c = new Color(r,gr,b);g.setColor(c);
  • 34. g.fillOval(100+i*5,100+i*5,100-i*10,100-i*10);}}}23. Program to illustrate the use of methods of vector classimport java.util.*;class vvect{ public static void main(String a[]) {
  • 35. Vector a1 = new Vector(); int l = a.length; int i; for(i=0;i<l;i++) { a1.addElement(a[i]); } a1.insertElementAt("Vatan",2); int s = a1.size(); String r[] = new String[s]; a1.copyInto(r); System.out.println("n Different Font Styles:n"); for(i=0;i<s;i++) { System.out.println(r[i]); } }}24. Program for showing the use ‘for’ in each statement.package loops;public class Forloops{public static void main(string[] args) {int loopval;
  • 36. int end_value=11;for (loopval=0; loopval<end_value;loopval++) {system.out.printin("loop value="+ loopval);}}}25. Program for showing a use of jdp programming in java.import java.lang.*;import java.sql.*;class bca{public static void main(String arg[]) throws Exception{ String stdrollno,stdname,stdclass; Connection conn;
  • 37. Statement stmt; ResultSet rs; Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); conn=DriverManager.getConnection("jdbc:odbc:pctedsn","bca","bca"); stmt=conn.createStatement(); rs=stmt.executeQuery("select id,stdname,class from try"); System.out.println("Roll No Student Name Class"); while(rs.next()) { stdclass = rs.getString(1); stdname = rs.getString(2); stdrollno = rs.getString(3); System.out.println(stdrollno+" "+stdname+" "+stdclass); } //stmt.close(); //rs.close();}}

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