Java programming practical

practical (1)

Aim:-Write a program to create a class and implement a default, overloaded any copy constructor

here is code:-
import java.util.*; class Student{ int roll; String name; public Student(){ roll=101; name="Archana"; } public Student(int r,String n){ roll =r; name=n; } public Student(Student s){ roll=s.roll; name=s.name; } void display(){ System.out.println("Roll No="+roll+"\tName="+name); } } class ConstructorDemo{ public static void main(String args[]){ Student s1=new Student(); s1.display(); Student s2=new Student(111,"Charvi"); s2.display(); Student s3= new Student(s1); s3.display(); } }

practical 1(B)

Aim:-write a program to create a class and implement the concepts of method overloading

here is the code:-
class MethodOverload{ public int sum(int x,int y){ return (x+y); } public int sum(int x,int y,int z){ return (x+y+z); } public double sum(double x,double y){ return (x+y); } public static void main(String args[]){ MethodOverload m=new MethodOverload(); System.out.println(m.sum(10,20)); System.out.println(m.sum(10,20,30)); System.out.println(m.sum(10.5,20.5)); } }

practical 1 (c)

Aim:-write a program to create a class and implement the concepts of static method

here is the code:-
class Demo{ void display(){ System.out.println("A non-static method is called."); } static void show(){ System.out.println("The static method is called."); } } public class StaticDemo{ public static void main(String args[]){ Demo obj=new Demo(); obj.display(); Demo.show(); } }

practical  2(A)

Aim:-   Write a program to create a class and implement concept of Inheritance and method overloading 

here is the code:-
class Base{ void show(){ System.out.println("Base class show() method invoked"); } } class Derived extends Base{ void show(){ System.out.println("Derived class show() method invoked"); } } class OverDemo{ public static void main(String args[]){ Derived d=new Derived(); d.show(); } }

practical 2(B)

Aim:-write a program to implement the concepts of Abstract classes and methods.

here is the code:-
import java.util.*; abstract class Shape{ abstract void area(); } class Rectangle extends Shape{ void area(){ double l,b; Scanner s=new Scanner(System.in); System.out.println("Enter length of Rectangle:"); l=s.nextDouble(); System.out.println("Enter Breadth of Rectangle:"); b=s.nextDouble(); System.out.println("Area of Rectangle:"+(l*b)); } } class Circle extends Shape{ void area(){ double r; Scanner s=new Scanner(System.in); System.out.println("Enter radius of circle:"); r=s.nextDouble(); System.out.println("Area of Circle:"+(3.14*r*r)); } } class AbstractDemo{ public static void main(String args[]){ Rectangle R=new Rectangle(); R.area(); Circle C=new Circle(); C.area(); } }

practical 2(C)

Aim:-write a program to implement concept of Interfaces

Here is the code:-
import java.util.*; interface A{ void getA(); } interface B{ void getB(); } class C implements A,B{ public void getA(){ System.out.println("getA() method is Invoked"); } public void getB(){ System.out.println("getB() method is Invoked"); } } class MultipleDemo{ public static void main(String args[]){ C c1=new C(); c1.getA(); c1.getB(); } }

practical 3(a)

Aim:-  Write a program to re-use built-in exception and raise them as per the requirement.

Here is the code:-
import java.io.*; public class ExceptionDemo { public static void main(String args[])throws IOException { int n1=10,n2=0; int a[]={1,2,3}; int d1,d2; System.out.println("Handling Arithmetic Exception:"); try { d1=n1/n2; } catch(ArithmeticException e) { System.out.println("Division by zero exception:"+e); } System.out.println("Handling Array Index Out of Bound Exception:"); try { d2=a[0]/a[3]; } catch(ArrayIndexOutOfBoundsException e) { System.out.println("Division by array index out of bound exception:"+e); } } } /* javac ExceptionDemo java ExceptionDemo */

practical 3(B)

Aim:-Write a program to define exception and raise them as per the requirement

Here is the code:-
import java.util.*; class AgeNotMatchException extends Exception{ AgeNotMatchException(String msg){ super(msg); } } class Student extends RuntimeException{ private String name; private int age; public Student(String name,int age){ this.name=name; this.age=age; try{ if(age<15||age>20){ String msg="Age is not between 15 and 20"; AgeNotMatchException ae=new AgeNotMatchException(msg); throw ae; } } catch(AgeNotMatchException e){ e.printStackTrace(); } } public void display(){ System.out.println("Name of the student:"+this.name); System.out.println("Age of the student:"+this.age); } } class MyExceptionDemo{ public static void main(String args[]){ Scanner sc=new Scanner(System.in); System.out.println("Enter the name of Student:"); String name=sc.next(); System.out.println("Enter the age of the student should be 15 to 20(including 15 and 20):"); int age=sc.nextInt(); Student obj =new Student(name,age); obj.display(); } }

practical 4

Aim:-Write a java application to demonstrate 5 bouncing balls of different colors using thread

Here is the code:-
import java.applet.Applet; import java.awt.Color; import java.awt.Graphics; /* <html> <applet code="BouncingBall.class" height=400 width=400> </applet> </html> */ class Ball { int x,y,radius,dx,dy; Color BallColor; public Ball(int x,int y,int radius,int dx,int dy,Color bColor) { this.x=x; this.y=y; this.radius=radius; this.dx=dx; this.dy=dy; BallColor=bColor; } } public class BouncingBall extends Applet implements Runnable { Ball redBall,blackBall,greenBall,blueBall,pinkBall; public void init() { redBall=new Ball(200,200,20,2,10,Color.red); blackBall=new Ball(160,190,20,4,8,Color.black); greenBall=new Ball(120,180,20,6,6,Color.green); blueBall=new Ball(80,170,20,8,4,Color.blue); pinkBall=new Ball(40,160,20,10,2,Color.pink); Thread t=new Thread(this); t.start(); } public void paint(Graphics g) { g.setColor(redBall.BallColor); g.fillOval(redBall.x,redBall.y,redBall.radius,redBall.radius); g.setColor(blackBall.BallColor); g.fillOval(blackBall.x,blackBall.y,blackBall.radius,blackBall.radius); g.setColor(greenBall.BallColor); g.fillOval(greenBall.x,greenBall.y,greenBall.radius,greenBall.radius); g.setColor(blueBall.BallColor); g.fillOval(blueBall.x,blueBall.y,blueBall.radius,blueBall.radius); g.setColor(pinkBall.BallColor); g.fillOval(pinkBall.x,pinkBall.y,pinkBall.radius,pinkBall.radius); } public void run() { while(true) { try { displacementOperation(redBall); displacementOperation(blackBall); displacementOperation(greenBall); displacementOperation(blueBall); displacementOperation(pinkBall); Thread.sleep(20); repaint(); } catch(Exception e){} } } public void displacementOperation(Ball ball) { if(ball.y >=400||ball.y <=0) { ball.dy=-ball.dy; } if(ball.x >=400|| ball.x <=0) { ball.dx=-ball.dx; } ball.y=ball.y-ball.dy; ball.x=ball.x-ball.dx; } } /*javac BouncingBall.java appletviewer BouncingBall.java */

practical 6(A)

Aim:- Create a swing application that randomly changes color an button click

Here is the code:-
import java.awt.*; import java.awt.event.*; import javax.swing.*; import java.util.*; public class ColourChangeApp extends JFrame implements ActionListener { JButton b1; Container c; public ColourChangeApp() { c=getContentPane(); c.setLayout(new FlowLayout()); b1=new JButton("Change Colour"); b1.setBounds(50,20,150,200); b1.addActionListener(this); c.add(b1); setSize(400,400); setVisible(true); setTitle("Colour changing Window"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public void actionPerformed(ActionEvent e) { if(e.getSource()==b1) { int R=(int)(Math.random()*100)%255; int G=(int)(Math.random()*100)%255; int B=(int)(Math.random()*100)%255; Color mycolor=new Color(R,G,B); c.setBackground(mycolor); }} public static void main(String args[]){ new ColourChangeApp(); } } /* javac ColourChangeApp.java java ColourChangeApp */

Practical 6(c)

Aim:-  Create a swing application that randomly demonstrate use of scroll pane to change its color selected using color chooser

here is the code:-
import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class ScrollPaneApp extends JFrame implements ActionListener { JScrollPane sp; JButton b; JTextArea ta; ScrollPaneApp() { setSize(500,500); setVisible(true); setTitle("ColourChange ScrollPane Application"); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setLayout(new FlowLayout()); ta=new JTextArea("This Textarea in ScrollPane",2,20); sp=new JScrollPane(ta); sp.setPreferredSize(new Dimension(200,80)); sp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS); sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); add(sp); b=new JButton("Change Color"); add(b); sp.setBorder(BorderFactory.createLineBorder(Color.RED)); b.addActionListener(this); } public void actionPerformed(ActionEvent e) { Color initialColor=Color.BLUE; Color selectedColor=JColorChooser.showDialog(this,"Select a BackgroundColor",initialColor); sp.setBackground(selectedColor); } public static void main(String[] args) { new ScrollPaneApp(); } } /*javac ScrollPaneApp.java java ScrollPaneApp */

practical 7(A)

Aim:-Flow Layout

here is the code:-
import java.awt.*; import javax.swing.*; public class MyFlowLayout { JFrame f=new JFrame(); MyFlowLayout() { JButton b1=new JButton("1"); JButton b2=new JButton("2"); JButton b3=new JButton("3"); JButton b4=new JButton("4"); JButton b5=new JButton("5"); f.add(b1);f.add(b2);f.add(b3);f.add(b4);f.add(b5); f.setLayout(new FlowLayout(FlowLayout.RIGHT)); f.setSize(300,300); f.setVisible(true); } public static void main(String[]args) { new MyFlowLayout(); } } /*javac MyFlowLayout.java java MyFlowLayout */

practical 7(B)

Aim:-Grid Layout

Here is the code:-
import java.awt.*; import javax.swing.*; public class MyGridLayout { MyGridLayout(){ JFrame f=new JFrame(); JButton b1=new JButton("1"); JButton b2=new JButton("2"); JButton b3=new JButton("3"); JButton b4=new JButton("4"); JButton b5=new JButton("5"); JButton b6=new JButton("6"); JButton b7=new JButton("7"); JButton b8=new JButton("8"); JButton b9=new JButton("9"); f.add(b1);f.add(b2);f.add(b3); f.add(b4);f.add(b5);f.add(b6); f.add(b7);f.add(b8);f.add(b9); f.setLayout(new GridLayout(3,3)); f.setSize(300,300); f.setVisible(true); } public static void main(String[]args) { new MyGridLayout(); } } /* javac MyGridLayout.java java MyGridLayout */

practical 7(c)

Aim:-BORDER LAYOUT

here is the code:-
import java.awt.*; import javax.swing.*; public class MyBorderLayout { MyBorderLayout() { JFrame f=new JFrame(); JButton b1=new JButton("NORTH"); JButton b2=new JButton("SOUTH"); JButton b3=new JButton("EAST"); JButton b4=new JButton("WEST"); JButton b5=new JButton("CENTER"); f.add(b1,BorderLayout.NORTH); f.add(b2,BorderLayout.SOUTH); f.add(b3,BorderLayout.EAST); f.add(b4,BorderLayout.WEST); f.add(b5,BorderLayout.CENTER); f.setSize(300,300); f.setVisible(true); } public static void main(String[] args) { new MyBorderLayout(); } } /*javac MyBorderLayout java MyBorderLayout */

Practical 8

Write a program to demonstrate the following events.

(A)

Aim:-Action Event

Here is the code:-
import java.awt.*; import java.awt.event.*; public class ActionEventExample implements ActionListener{ TextField tf; Button b; Frame f; ActionEventExample(){ f=new Frame("ActionEventExample"); tf=new TextField(); tf.setBounds(50,50,200,20); b=new Button("Click Here"); b.setBounds(50,100,60,30); b.addActionListener(this); f.add(b); f.add(tf); f.setSize(400,400); f.setLayout(null); f.setVisible(true); } public void actionPerformed(ActionEvent e){ tf.setText("Welcome to viva college"); } public static void main(String[] args){ new ActionEventExample(); } } /* javac ActionEventExample.java java ActionEventExample */

(B)

Aim:-Mouse Event

Here is the code:-
import java.awt.*; import java.awt.event.*; public class MouseEventExample extends Frame implements MouseListener{ Label l; MouseEventExample(){ addMouseListener(this); l=new Label(); l.setBounds(20,50,100,20); add(l); setSize(300,300); setLayout(null); setVisible(true); } public void mouseClicked(MouseEvent e){ l.setText("Mouse Clicked"); } public void mouseEntered(MouseEvent e){ l.setText("Mouse Entered"); } public void mouseExited(MouseEvent e){ l.setText("Mouse Exited"); } public void mousePressed(MouseEvent e){ l.setText("Mouse Pressed"); } public void mouseReleased(MouseEvent e){ l.setText("Mouse Released"); } public static void main(String[] args){ new MouseEventExample(); } } /*javac MouseEventExample.java java MouseEventExample */

(C)

Aim:-Key Event

here is the code:-
import java.awt.*; import java.awt.event.*; public class KeyEventExample extends Frame implements KeyListener { Label l; TextArea area; KeyEventExample() { l=new Label(); l.setBounds (20, 50, 100, 20); area=new TextArea(); area.setBounds (20, 80, 300, 300); area.addKeyListener(this); add(l); add(area); setSize(400,400); setLayout(null); setVisible(true); } public void keyPressed (KeyEvent e) { l.setText ("Key Pressed"); } public void keyReleased (KeyEvent e) { l.setText ("Key Released"); } public void keyTyped (KeyEvent e) { l.setText ("Key Typed"); } public static void main(String[] args) { new KeyEventExample(); } } /*javac KeyEventExample.java java KeyEventExample */

Practical 9

Aim:-Demonstrate the use of adapter class in Event Handling 

Here is the code:-
import java.awt.*; import java.awt.event.*; public class AdapterExample extends Frame { AdapterExample() { addWindowListener(new MyInnerClass()); setSize(300,300); setLayout(null); setVisible(true); setTitle("Adapter Class example"); } class MyInnerClass extends WindowAdapter { public void windowClosing(WindowEvent e) { dispose(); } } public static void main(String[] args) { new AdapterExample(); } }

Practical 10

Aim:-Demonstrate the use of Anonymous Adapter class in event Handling

here is the code:-
import java.awt.*; import java.awt.event.*; public class AnonymousAdapter extends Frame { AnonymousAdapter() { addMouseListener(new MouseAdapter() { public void mouseClicked(MouseEvent e) { Graphics g=getGraphics(); g.setColor(Color.BLUE); g.fillOval(e.getX(),e.getY(),30,30); } }); setSize(300,300); setLayout(null); setVisible(true); } public static void main(String[] args) { new AnonymousAdapter(); } } /* javac AnonymousAdapter.java java AnonymousAdapter */