Java programming lab_manual_by_rohit_jaiswar

Java programming lab_manual_by_rohit_jaiswar

• 1.
  1. Write aJAVA Program to demonstrate Constructor Overloading and Method overloading. class box { double width,height,depth,length,breadth; box() { } box(double w,double h,double d) { width = w; height = h; depth = d; } box(double len) { width = height = depth = len; } void rect(double x,double y) { length = x; breadth = y; } void rect(double x) { length = breadth = x; } double volume() { return(width * height * depth); } double area() { return(length * breadth); } } class lab01a { public static void main(String args[]) { box mybox1 = new box(10,20,15); box mybox2 = new box(5); box rect1 = new box(); box rect2 = new box();
• 2.
  rect1.rect(10,20); rect2.rect(8); double areaR, vol; vol= mybox1.volume(); System.out.println("Volume of mybox1 = " +vol); vol = mybox2.volume(); System.out.println("Volume of mybox2 = " +vol); areaR = rect1.area(); System.out.println("Area of rect1= " +areaR); areaR = rect2.area(); System.out.println("Area of rect1 = " +areaR); } } Output: C:New Folder>java lab01a Volume of mybox1 = 3000.0 Volume of mybox2 = 125.0 Area of rect1= 200.0 Area of rect1 = 64.0 2. Write a JAVA Program to implement Inner class and demonstrate its Access Protections. class outer { int outdata = 10; void display() { inner inobj = new inner(); System.out.println("Accessing from outer class"); System.out.println("The value of outdata is " +outdata); System.out.println("The value of indata is " +inobj.indata); } class inner { int indata = 20; void inmethod() { System.out.println("Accessing from inner class"); System.out.println("The sum of indata & outdata is " +(outdata + indata)); } } }
• 3.
  class lab01b { public staticvoid main(String args[]) { outer outobj = new outer(); outobj.display(); outer.inner inobj1 = outobj.new inner(); inobj1.inmethod(); } } Output: C:New Folder>java lab01b Accessing from outer class The value of outdata is 10 The value of indata is 20 Accessing from inner class The sum of indata & outdata is 30 3. Write a JAVA Program to implement Inheritance. class A { int i = 10; protected int j = 20; void showij() { System.out.println("i = " +i); System.out.println("j = " +j); } } class B extends A { int k = 30; void showk() { System.out.println("k = " +k); } void sum() { System.out.println("i + j + k = " +(i+j+k)); } } class lab02a { public static void main(String args[]) {
• 4.
  B subobj =new B(); System.out.println("Contents of Super class accessed using sub class object"); subobj.showij(); System.out.println("Contents of Supter class accessed using sub class object"); subobj.showk(); System.out.println("Sum of i, j, & k accessed using sub class object"); subobj.sum(); } } Output: C:New Folder>java lab02a Contents of Super class accessed using sub class object i = 10 j = 20 Contents of Super class accessed using sub class object k = 30 Sum of i, j, & k accessed using sub class object i + j + k = 60 4. Write a JAVA Program to implement Exception Handling (Using Nested try catch and finally). class Nesttry { public static void main(String args[]) { try { int a = args.length; int b = 42 / a; System.out.println("a" + "= " + a); try { if(a==1) a = a / (a-a); if(a==2) { int c[] = {1}; c[42] = 99; } } catch(ArrayIndexOutOfBoundsException e) { System.out.println("array out of bounds" + e) ; } finally { System.out.println("inside first try"); } }
• 5.
  catch(ArithmeticException e) { System.out.println("Arithmetic Exp"+ e); } finally { System.out.println("Inside 2nd try"); } } } Output: C:New Folder>java Nesttry Arithmetic Expjava.lang.ArithmeticException: / by zero Inside 2nd try C:New Folder>java Nesttry 1 3 a= 2 array out of boundsjava.lang.ArrayIndexOutOfBoundsException: 42 inside first try Inside 2nd try 5. Write JAVA programs which demonstrate utilities of Linked List Class. // Demonstrate Linked List. import java.util.*; class LinkedListDemo { public static void main (String args[]) { // Create a linked list. Linked List<String> ll = new LinkedList<String>(); // Add elements to the linked list. ll.add ("F"); ll.add ("B"); ll.add ("D"); ll.add ("E"); ll.add ("C"); ll.addLast ("Z"); ll.addFirst ("A"); ll.add (1, "A2"); System.out.println ("Original contents of ll: " + ll); // Remove elements from the linked list. ll.remove ("F"); ll.remove (2); System.out.println ("Contents of ll after deletion: "+ ll); // Remove first and last elements. ll.removeFirst (); ll.removeLast ();
• 6.
  System.out.println ("ll afterdeleting first and last: "+ ll); // Get and set a value. String val = ll.get (2); ll.set (2, val + “Changed"); System.out.println ("ll after change: " + ll); } } OutPut : Original contents of ll: [A, A2, F, B, D, E, C, Z] Contents of ll after deletion: [A, A2, D, E, C, Z] ll after deleting first and last: [A2, D, E, C] ll after change: [A2, D, E Changed, C] 6. Write JAVA programs which uses FileInputStream/FileOutputStream Classes. a) FileinputStream /*FileInStreamDemo.java*/ import java.io.*; public class FileInStreamDemo { public static void main(String[] args) { // create file object File file = new File("DevFile.txt"); int ch; StringBuffer strContent = new StringBuffer(""); FileInputStream fin = null; try { fin = new FileInputStream(file); while ((ch = fin.read()) != -1) strContent.append((char) ch); fin.close(); } catch (FileNotFoundException e) { System.out.println("File " + file.getAbsolutePath() + " could not be found on filesystem"); } catch (IOException ioe) { System.out.println("Exception while reading the file" + ioe); } System.out.println("File contents :"); System.out.println(strContent); } } OutPut: C:New Folder>java FileInStreamDemo File contents :
• 7.
  The text shownhere will write to a file after run b)FileoutputStream /* Example of FileOutputStream */ import java.io.*; public class FileOutStreamDemo { public static void main(String[] args) { FileOutputStream out; // declare a file output object PrintStream p; // declare a print stream object try { // Create a new file output stream connected to "DevFile.txt" out = new FileOutputStream("DevFile.txt"); // Connect print stream to the output stream p = new PrintStream(out); p.println("The text shown here will write to a file after run"); System.out.println("The Text is written to DevFile.txt"); p.close(); } catch (Exception e) { System.err.println("Error writing to file"); } } } OutPut: C:New Folder>java FileOutStreamDemo The Text is written to DevFile.txt 7. Write a JAVA Program which writes a object to a file (use transient variable also). import java.util.Vector; import java.io.*; public class SerializationTest { static long start,end; OutputStream out = null; OutputStream outBuffer = null; ObjectOutputStream objectOut = null; public Person getObject() { Person p = new Person("SID","austin"); Vector v = new Vector(); for(int i=0;i<7000;i++) { v.addElement("StringObject:" +i); } p.setData(v);
• 8.
  return p; } public staticvoid main(String[] args) { SerializationTest st = new SerializationTest(); start = System.currentTimeMillis(); st.writeObject(); end = System.currentTimeMillis(); System.out.println("Time taken for writing :"+ (end-start) + "milli seconds"); } public void writeObject() { try { out = new FileOutputStream("c:/temp/test.txt"); outBuffer = new BufferedOutputStream(out); objectOut = new ObjectOutputStream(outBuffer); objectOut.writeObject(getObject()); } catch(Exception e){e.printStackTrace();} finally { if(objectOut != null) try { objectOut.close();}catch(IOException e){e.printStackTrace(); } } } } class Person implements java.io.Serializable { private String name; private transient Vector data; private String address; public Person(String name,String address) { this.name = name; this.address = address; } public String getAddress() { return address; } public Vector getData() { return data; } public String getName() {
• 9.
  return name; } public voidsetData(Vector data) { this.data = data; } } 8. Write JAVA programs which uses Datagram Socket for Client Server Communication. // Demonstrate datagrams. import java.net.*; class WriteServer { public static int serverPort = 998; public static int clientPort = 999; public static int buffer_size = 1024; public static DatagramSocket ds; public static byte buffer[] = new byte[buffer_size]; public static void TheServer() throws Exception { int pos=0; while (true) { int c = System.in.read(); switch (c) { case -1: System.out.println("Server Quits."); return; case 'r': break; case 'n': ds.send(new DatagramPacket(buffer,pos, InetAddress.getLocalHost(),clientPort)); pos=0; break; default: buffer[pos++] = (byte) c; } } } public static void TheClient() throws Exception { while(true) { DatagramPacket p = new DatagramPacket(buffer, buffer.length); ds.receive(p); System.out.println(new String(p.getData(), 0, p.getLength()));
• 10.
  } } public static voidmain(String args[]) throws Exception { if(args.length == 1) { ds = new DatagramSocket(serverPort); TheServer(); } else { ds = new DatagramSocket(clientPort); TheClient(); } } } 9. Write JAVA programs which handles MouseEvent // Demonstrate the mouse event handlers. import java.awt.*; import java.awt.event.*; import java.applet.*; /* <applet code="MouseEvents" width=300 height=100> </applet> */ public class MouseEvents extends Applet implements MouseListener, MouseMotionListener { String msg = ""; int mouseX = 0, mouseY = 0; // coordinates of mouse public void init() { addMouseListener(this); addMouseMotionListener(this); } // Handle mouse clicked. public void mouseClicked(MouseEvent me) { // save coordinates mouseX = 0; mouseY = 10; msg = "Mouse clicked."; repaint(); } // Handle mouse entered. public void mouseEntered(MouseEvent me) { // save coordinates
• 11.
  mouseX = 0; mouseY= 10; msg = "Mouse entered."; repaint(); } // Handle mouse exited. public void mouseExited(MouseEvent me) { // save coordinates mouseX = 0; mouseY = 10; msg = "Mouse exited."; repaint(); } // Handle button pressed. public void mousePressed(MouseEvent me) { // save coordinates mouseX = me.getX(); mouseY = me.getY(); msg = "Down"; repaint(); } // Handle button released. public void mouseReleased(MouseEvent me) { // save coordinates mouseX = me.getX(); mouseY = me.getY(); msg = "Up"; repaint(); } // Handle mouse dragged. public void mouseDragged(MouseEvent me) { // save coordinates mouseX = me.getX(); mouseY = me.getY(); msg = "*"; showStatus("Dragging mouse at " + mouseX + ", " + mouseY); repaint(); } // Handle mouse moved. public void mouseMoved(MouseEvent me) { // show status showStatus("Moving mouse at " + me.getX() + ", " + me.getY()); } // Display msg in applet window at current X,Y location. public void paint(Graphics g)
• 12.
  { g.drawString(msg, mouseX, mouseY); } } 10.Write JAVA programs which handles keyboardEvent // Demonstrate the key event handlers. import java.awt.*; import java.awt.event.*; import java.applet.*; /* <applet code="SimpleKey" width=300 height=100> </applet> */ public class SimpleKey extends Applet implements KeyListener { String msg = ""; int X = 10, Y = 20; // output coordinates public void init() { addKeyListener(this); } public void keyPressed(KeyEvent ke) { showStatus("Key Down"); } public void keyReleased(KeyEvent ke) { showStatus("Key Up"); } public void keyTyped(KeyEvent ke) { msg += ke.getKeyChar(); repaint(); } // Display keystrokes. public void paint(Graphics g) { g.drawString(msg, X, Y); } }