Develop a program to draw a polygon.

Code:

Import java.applet.*;

importjava.awt.*;

public class Draw extends java.applet.Applet

{

intxCoords[] = { 50, 200, 300, 150, 50, 50 };

intyCoords[] = { 100, 0, 50, 300, 200, 100 };

public void paint(Graphics g)

{

g.drawString("Polygon",50,50);

g.drawPolygon(xCoords, yCoords, 6);

}

/* <applet code=Draw width=300 height=300>

</applet>

Output:

Comments

Define an exception called ‘NotMatchexception’ that is thrown when a string is not equal to ‘India’. Write a java program that uses this exception.

Code: import java.util.Scanner; class NotMatchException extends Exception { public NotMatchException (String str) { System.out.println(str); } } public class StringExc { public static void main(String[] args) { Scanner scan = new Scanner(System.in); System.out.print("Enter the string : "); String input = scan.nextLine(); try { if(input.equalsIgnoreCase("India")) System.out.println("String matched !!!"); else throw new NotMatchException ("String not matched !!!"); } catch (NotMatchException s) { ...

Program to calculate the room area and volume to illustrate the concept of single inheritance.

CODE: class Roomarea { protected double l, b; Roomarea(double len, double br) { l=len; b=br; } void putdata() { System.out.println("Area of Room: "+(l*b)); } } class Roomvol extends Roomarea { double h; Roomvol(double len, double br, double he) { super(len, br); h=he; } void putdata() { super.putdata(); System.out.println("Volume of Room: "+(l*b*h)); } } public class EXP18Q4 { public static void main(String[] args) { Roomvol r1 = new Roomvol(10, 20, 10); r1.putdata(); } }

Develop a program to accept a Password from the user and throw “Authentication Failure” exception if the password is incorrect

import java.util.*; class Test { public static void main(String args[]) { try { System.out.println("Enter Password: "); Scanner obj=new Scanner(System.in); String pass= obj.nextLine(); if(!pass.equals("1234")) System.out.println("Authentication Failure"); else System.out.println("Welcome....!!"); } catch (Exception e) { System.out.println(""); } finally { System.out.println("Thank You.........!!!!!"); ...

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