quest 1 define a class batsman with the following specifications
TRANSCRIPT
Quest 1 Define a class batsman with the following specifications:Private members:bcode 4 digits code numberbname 20 charactersinnings, notout, runs integer typebatavg it is calculated according to the formula – batavg =runs/(innings-notout)calcavg() Function to compute batavgPublic members:readdata() Function to accept value from bcode, name, innings, & notout and invoke the function calcavg()displaydata() Function to display the data members on the screen.
import java.util.Scanner;
class batsman
{
private int bcode;
private String bname;
private int innings,notout,runs;
double batavg;
private void batavg()
{
}
private void calcavg()
{
batavg =runs/(innings-notout);
}
public void readdata()
{
Scanner in=new Scanner(System.in);
System.out.print("Enter the batsman code: ");
bcode=in.nextInt();
System.out.print("Enter the batsman name: ");
bname=in.next();
System.out.print("Enter the number of innings: ");
innings=in.nextInt();
System.out.print("Enter the number of not out: ");
notout=in.nextInt();
System.out.print("Enter the batsman runs: ");
runs=in.nextInt();
calcavg();
}
public void displaydata()
{
System.out.println("batsman code: " +bcode);
System.out.println("batsman name: " +bname);
System.out.println("number of innings: " +innings);
System.out.println("number of not out: " +notout);
System.out.println("batsman runs: " +runs);
System.out.println("batsman average: " +batavg);
}
}
class batman
{
public static void main(String args[])
{
batsman b=new batsman();
b.readdata();
b.displaydata();
}
}
Ques 2. Define a class TEST in JAVA with following description:Private MembersTestCode of type integerDescription of type stringNoCandidate of type integerCenterReqd (number of centers required) of type integer
A member function CALCNTR() to calculate and return the number of centers as(NoCandidates/100+1)Public Members - A function SCHEDULE() to allow user to enter values for TestCode, Description, NoCandidate & call function CALCNTR() to calculate the number of Centres- A function DISPTEST() to allow user to view the content of all the data members
import java.util.Scanner;
class Test {
private int testcode;
private String Des;
private int nocandi;
private int calcntr()
{
return (nocandi/100+1);
}
public void schedule()
{
Scanner s = new Scanner(System.in);
System.out.print("Enter the testcode values:");
testcode = s.nextInt();
System.out.print("Enter the description:");
Des = s.next();
System.out.print("No. of candidate:");
nocandi = s.nextInt();
calcntr();
}
public void disptest()
{
System.out.println("testcode :" +testcode);
System.out.println("description is :" +Des);
System.out.println("no. of centers is :" +nocandi);
}
}
class testt
{
public static void main(String[] args) {
Test t1 = new Test();
t1.schedule();
t1.disptest();
}
}
Quest 3. Define a class in C++ with following description:Private MembersA data member Flight number of type integer
A data member Destination of type stringA data member Distance of type floatA data member Fuel of type floatA member function CALFUEL() to calculate the value of Fuel as per the following criteria Distance Fuel <=1000 500 more than 1000 and <=2000 1100 more than 2000 2200Public MembersA function FEEDINFO() to allow user to enter values for Flight Number, Destination, Distance & call function CALFUEL() to calculate the quantity of FuelA function SHOWINFO() to allow user to view the content of all the data members
import java.util.Scanner;
class flight
{
private int flight_no;
private String destination;
private float distance;
private float fuel;
private void calfuel()
{
if (distance<=1000)
fuel=500;
else if(distance>=2000)
fuel=1000;
else fuel= 2200;
}
public void FEEDINFO()
{
Scanner in=new Scanner(System.in);
System.out.print("Enter the Flight number: ");
flight_no=in.nextInt();
System.out.print("Enter the Destination of flight: ");
destination=in.next();
System.out.print("Enter the Distance of Flight: ");
distance=in.nextFloat();
calfuel();
}
public void SHOWINFO()
{
System.out.println("Flight number= " +flight_no);
System.out.println("Destination of flight= " +destination);
System.out.println("Distance of Flight= " +distance);
System.out.println("Fuel= " +fuel);
}
}
class flighttest
{
public static void main(String args[])
{
flight ft=new flight();
ft.FEEDINFO();
ft.SHOWINFO();
}
}
Quest 4. Define a class BOOK with the following specifications :Private members of the class BOOK areBOOK NO integer typeBOOKTITLE 20 charactersPRICE float (price per copy)TOTAL_COST() A function to calculate the total cost for N number of copies
where N is passed to the function as argument. Public members of the class BOOK areINPUT() function to read BOOK_NO. BOOKTITLE, PRICEPURCHASE() function to ask the user to input the number of copies to be
purchased. It invokes TOTAL_COST() and prints the total
cost to be paid by the user. import java.util.Scanner;
class BOOK
{
private int book_no,no_copies;
private String book_title;
private float price,cost;
private void TOTAL_COST(int n)
{
cost=n*price;
}
public void input()
{
Scanner in=new Scanner(System.in);
System.out.print("Enter the Book Number: ");
book_no=in.nextInt();
System.out.print("Enter the Book Title: ");
book_title=in.next();
System.out.print("Enter the Book Price: ");
price=in.nextFloat();
}
public void purchase()
{
Scanner in=new Scanner(System.in);
System.out.print("enter the no of copies purchase:");
no_copies=in.nextInt();
TOTAL_COST(no_copies);
}
public void display()
{
System.out.println("Book Number: "+book_no);
System.out.println("Book Title: "+book_title);
System.out.println("Book Price: "+price);
System.out.println("Number of copies: "+no_copies);
System.out.println("total Cost " +cost);
}
}
class books
{
public static void main(String args[])
{
BOOK b= new BOOK();
b.input();
b.purchase();
b.display();
}
}
Quest 5. Define a class REPORT with the following specification:Private members :adno 4 digit admission numbername 20 charactersmarks an array of 5 floating point valuesaverage average marks obtainedGETAVG() a function to compute the average obtained in five subjectPublic members:READINFO() function to accept values for adno, name, marks. Invoke the function GETAVG() DISPLAYINFO() function to display all data members of report on the screen.
import java.util.*;
class Report
{
private int adno;
private String name;
private double marks[]={56.00,68.50,69.30,76.00,78.30};
private double avg;
private double getavg()
{
return((56.00+68.50+69.30+76.00+78.30)/5.00);
}
public void readinfo()
{
Scanner in=new Scanner(System.in);
System.out.print("Enter 4 digit addmission number:");
adno=in.nextInt();
System.out.print("Enter name:");
name=in.next();
}
public void displayinfo()
{
System.out.println("The 4 digit admission number is:"+adno);
System.out.println("The name of the student is:"+name);
System.out.println("The avg in five subjects obtained by the student is:"+getavg());
}
}
class reportt
{
public static void main(String[] args)
{
Report obj=new Report();
obj.readinfo();
obj.displayinfo();
}
}
Q6. Define a class student with the following specificationPrivate members of class studentadmno integersname 20 charactereng. math, science floattotal floatctotal() a function to calculate eng + math + science with float return type.Public member function of class studentTakedata() Function to accept values for admno, sname, eng, science and invoke ctotal() to calculate total.Showdata() Function to display all the data members on the screen
import java.util.Scanner;
class Student
{
private int adno;
private String sname;
private float eng,math,sci;
private float total;
public void ctotal()
{
total=eng+math+sci;
}
public void takedata()
{
Scanner in=new Scanner(System.in);
System.out.print("Enter the Admission number: ");
adno=in.nextInt();
System.out.print("Enter the Name: ");
sname=in.next();
System.out.print("Enter the English Marks: ");
eng=in.nextFloat();
System.out.print("Enter the Math Marks: ");
math=in.nextFloat();
System.out.print("Enter the Science Marks: ");
sci=in.nextFloat();
ctotal();
}
public void showdata()
{
System.out.println("Addmission Number:" +adno);
System.out.println("English marks:" +eng);
System.out.println("Math marks:" +math);
System.out.println("Science marks:" +sci);
System.out.println("Total marks:" +total);
}
}
class studentt
{
public static void main(String[] args)
{
Student s1=new Student();
s1.takedata();
s1.showdata();
}
}
Q7. Define a class TelephoneData Members :intprv,pre - to store the previous and present meter readingint call - to store call made (pre-prv)String name - to store name of the customerdoubleamt - to store amount double total - to store total amountmember Methodsvoid input() -to get the value for previous, present reading and the
name of the customervoidcal() - to calculate amount and total amount void display() -to display the name , calls made, amount and total
amount to be paid in the following format.
Name Calls Made Amount Total Amount-------- ------------ ----------- ------------------
Calls made RateUpto 100 calls No chargeFor the next 100 calls 90 paisa per call
For the next 200 calls 80 paisa per callMore than 400 calls 70 paisa per call
Every customer has to pay Rs. 180 per month as monthly rent for the services.
import java.util.Scanner;
class Telephone
{
int prv,pre;
int call;
String name;
double amt;
double total;
void input()
{
Scanner s = new Scanner(System.in);
System.out.println("Enter the Customer name :");
name = s.next();
System.out.println("Enter the present meter reading");
pre = s.nextInt();
System.out.println("Enter the previous meter reading");
prv = s.nextInt();
System.out.println("total calls is :" );
call = (pre-prv);
}
void cal()
{
if(call<100)
{
System.out.println("charge rupee 180/- for montly services :");
System.out.println("no other charge ** Enjoy**");
amt = 0.0;
total = 180.0;
}
else if(call<=200)
{
System.out.println("charge rupee 180/- for montly services :");
System.out.println("charges is :" );
amt = 100*0.90;
total = 180+amt;
}
else if(call<=400)
{
amt = (100*0.90)+(200*0.80);
total = 180+amt;
}
else
{
amt = 0.40*call;
total=180+amt;
}
}
void display()
{
System.out.println("Name of the customer :" +name);
System.out.println("total calls : " +call);
System.out.println("amount without tax :" +amt);
System.out.println("Total amount :" +total);
}
}
class telephonee
{
public static void main(String[] args)
{
Telephone t = new Telephone();
t.input();
t.cal();
t.display();
}
}
Q8. (The Triangle class) Design a class named Triangle that extendsGeometricObject. The class contains:■ Three double data fields named side1, side2, and side3 with default values 1.0 to denote three sides of the triangle.■ A no-arg constructor that creates a default triangle.■ A constructor that creates a triangle with the specified side1, side2, and side3.■ The accessor methods for all three data fields.■ A method named getArea() that returns the area of this triangle.■ A method named getPerimeter() that returns the perimeter of this triangle.■ A method named toString() that returns a string description for the triangle.The toString() method is implemented as follows:return "Triangle: side1 = " + side1 + " side2 = " + side2 +" side3 = " + side3;For the formula to compute the area of a triangle. Implement the class. Write a test program that creates a Triangle object with sides 1, 1.5, 1, color yellow and filled true, and displays the area, perimeter, color, and whether filled or not.
class GeometricObject
{
private String color = "Yellow";
private Boolean filled = true;
public String getColor()
{
return color;
}
public void setColor(String color)
{
this.color = color;
}
public boolean isFilled()
{
return filled;
}
public void setFilled(boolean filled)
{
this.filled = filled;
}
public String toStrings()
{
return " Color: " + color + " and filled: " + filled;
}
}
class Triangle extends GeometricObject
{
private double side1 = 1.0;
private double side2 = 1.0;
private double side3 = 1.0;
public Triangle()
{}
public Triangle (double side1, double side2, double side3)
{
this.side1=side1;
this.side2=side2;
this.side3=side3;
}
public double getSide1()
{
return side1;
}
public double setSide2()
{
return side2;
}
public double setSide3()
{
return side3;
}
public void setSide1 (double side1)
{
this.side1=side1;
}
public void setSide2 (double side2)
{
this.side2=side2;
}
public double getArea()
{
return (side1+side2+side3)/2;
}
public double getPerimeter()
{
return side1+side2+side3;
}
public String toString()
{
return "Side 1 = " + side1 + " Side 2 = " + side2 + " Side 3 = " + side3;
}
}
public class trianglee
{
public static void main (String [ ] args)
{
Triangle Triangle = new Triangle(1,1.5,1);
System.out.println("The Triangle Sides are " + Triangle.toString());
System.out.println("The Triangle’s Area is " + Triangle.getArea());
System.out.println("The Triangle’s Perimeter is " + Triangle.getPerimeter());
System.out.println("The Triangle's Color is " + Triangle.getColor());
System.out.println("The Triangle is " + Triangle.isFilled());
}
}
Q9. (The Person, Student, Employee, Faculty, and Staff classes) Design a class named Person and its two subclasses named Student and Employee. Make Faculty and Staff subclasses of Employee. A person has a name, address, phone number, and email address. A student has a class status (freshman, sophomore, junior, or senior). Define the status as a constant. An employee has an office, salary, and date hired. Define a class named MyDate that contains the fields year, month, and day. A faculty member has office hours and a rank. A staff member has a title. Override the toString method in each class to display the class name and the person’s name. Implement the classes. Write a test program that creates a Person, Student, Employee, Faculty, and Staff, and invokes their toString() methods.
import java.util.Scanner;
class mydate
{
int d,m,y;
public void getdate()
{
Scanner in=new Scanner(System.in);
System.out.print("Enter day: ");
d=in.nextInt();
System.out.print("Enter month: ");
m=in.nextInt();
System.out.print("Enter Year: ");
y=in.nextInt();
}
public void putdate()
{
System.out.println("Day: " +d);
System.out.println("Month: " +m);
System.out.println("Year: " +y);
}
}
class Person
{
String name,address,email_address;
int phno;
public void getdata()
{
Scanner in=new Scanner(System.in);
System.out.print("Enter the name of a person: ");
name=in.nextLine();
System.out.print("Enter the address of a person: ");
address=in.nextLine();
System.out.print("Enter the phone number: ");
phno=in.nextInt();
System.out.print("Enter the email address: ");
email_address=in.next();
}
public void to_String()
{
System.out.println("Name= " +name);
System.out.println("Address= " +address);
System.out.println("Phno= " +phno);
System.out.println("Email address= " +email_address);
}
}
class Student extends Person
{
public String status;
public void getdata()
{
super.getdata();
Scanner in=new Scanner(System.in);
System.out.print("Enter the status: ");
status=in.nextLine();
}
public void to_String()
{
super.to_String();
System.out.println("Status= " +status);
}
}
class Employee extends Person
{
String office;
int salary;
mydate hired_date=new mydate();
public void getdata()
{
super.getdata();
Scanner in=new Scanner(System.in);
System.out.print("Enter office: ");
office=in.next();
System.out.print("Enter salary: ");
salary=in.nextInt();
System.out.print("Enter hiredate: ");
hired_date.putdate();
}
public void to_String()
{
super.to_String();
System.out.println("Office= " +office);
System.out.print("Salary= " +salary);
hired_date.putdate();
}
}
class faculty extends Employee
{
int rank;
float office_hrs;
public void getdata()
{
super.getdata();
Scanner in=new Scanner(System.in);
System.out.print("Enter rank: ");
rank=in.nextInt();
System.out.print("Enter office hours: ");
office_hrs=in.nextFloat();
}
public void to_String()
{
super.to_String();
System.out.println("Rank= " +rank);
System.out.println("Office hours= " +office_hrs);
}
}
class staff extends Employee
{
String title;
public void getdata()
{
super.getdata();
Scanner in=new Scanner(System.in);
System.out.println("Enter title: ");
title=in.next();
}
public void to_String()
{
super.toString();
System.out.println("title= " +title);
}
}
class testtt
{
public static void main(String[] args)
{
Scanner in=new Scanner(System.in);
int ch;
System.out.println("Enter the Information");
System.out.println("\n1.Student\n2.faculty\n3.staff\n");
System.out.print("Enter the choice: ");
ch=in.nextInt();
switch(ch)
{
case 1:
Student s=new Student();
s.getdata();
s.to_String();
break;
case 2:
faculty f=new faculty();
f.getdata();
f.to_String();
break;
case 3:
staff st=new staff();
st.getdata();
st.to_String();
break;
default:
System.out.println("No information available");
}
}
}
Q.19. Write a program using AWT/swings or create a GUI in application for a simple calculator. (use proper layout).import java.awt.*;import java.awt.event.*;import javax.swing.*;public class calculator extends JApplet { public static void main(String[] args) { JFrame window = new JFrame("Simple Calculator"); CalcPanel content = new CalcPanel(); window.setContentPane(content); window.pack(); window.setLocation(100,100); window.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE ); window.setVisible(true); } public void init() { setContentPane( new CalcPanel() ); } public static class CalcPanel extends JPanel implements ActionListener { private JTextField xInput, yInput;
private JLabel answer; public CalcPanel() { setBackground(Color.GRAY); setBorder( BorderFactory.createEmptyBorder(5,5,5,5) ); xInput = new JTextField("0", 10); xInput.setBackground(Color.WHITE); yInput = new JTextField("0", 10); yInput.setBackground(Color.WHITE); JPanel xPanel = new JPanel(); xPanel.add( new JLabel(" x = ")); xPanel.add(xInput); JPanel yPanel = new JPanel(); yPanel.add( new JLabel(" y = ")); yPanel.add(yInput); JPanel buttonPanel = new JPanel(); buttonPanel.setLayout(new GridLayout(1,4)); JButton plus = new JButton("+"); plus.addActionListener(this); buttonPanel.add(plus); JButton minus = new JButton("-"); minus.addActionListener(this); buttonPanel.add(minus); JButton times = new JButton("*"); times.addActionListener(this); buttonPanel.add(times); JButton divide = new JButton("/"); divide.addActionListener(this); buttonPanel.add(divide); answer = new JLabel("x + y = 0", JLabel.CENTER); answer.setForeground(Color.red); answer.setBackground(Color.white); answer.setOpaque(true); setLayout(new GridLayout(4,1,3,3)); add(xPanel); add(yPanel); add(buttonPanel); add(answer); xInput.requestFocus(); } public void actionPerformed(ActionEvent evt) { double x, y; try { String xStr = xInput.getText(); x = Double.parseDouble(xStr); }
catch (NumberFormatException e) { answer.setText("Illegal data for x."); xInput.requestFocus(); return; } try { String yStr = yInput.getText(); y = Double.parseDouble(yStr); } catch (NumberFormatException e) { answer.setText("Illegal data for y."); yInput.requestFocus(); return; } String op = evt.getActionCommand(); if (op.equals("+")) answer.setText( "x + y = " + (x+y) ); else if (op.equals("-")) answer.setText( "x - y = " + (x-y) ); else if (op.equals("*")) answer.setText( "x * y = " + (x*y) ); else if (op.equals("/")) { if (y == 0) answer.setText("Can't divide by zero!"); else answer.setText( "x / y = " + (x/y) ); } } } }
Q.20. Write a program to generate a sequence of Fibonacci Strings as follows: S0 = “a”, S1 = “b”, Sn = S(n-1) + S(n-2) where ‘+’ denotes concatenation. Thus the sequence is:a, b, ba, bab, babba, babbabab, ………. n terms and add this generated series to a file named as fibo.txt.
import java.io.*;
import java.lang.*;import java.util.*;class fibo{public static void main(String[] args){
FileOutputStream fout=null;try{
fout = new FileOutputStream("fibo.txt");char ch='y',t,ar[];String s1="a",s2="b",s3=null;t= s1.charAt(0);fout.write(t); fout.write(' '); t= s2.charAt(0); fout.write(t);fout.write(' ');Scanner reader = new Scanner(System.in);
do{
s3=s1+s2; s1=s2; s2=s3; ar=s3.toCharArray();for(int i=0;i<s3.length();i++)fout.write(ar[i]);fout.write(' ');System.out.println(" do you want to continue?(y/n)");ch = reader.next().charAt(0);}while(ch!='n');
}catch(IOException e){System.out.println(e);System.exit(-1);}finally{try{fout.close();
}catch(IOException e){}}
}}
Q21. Write a temperature conversion program using GUI either application or applet that converts from Fahrenheit to Celsius. The Fahrenheit temperature should be entered from keyboard(via textfield) and another textfield should be used to display the converted temperature. (use a proper layout for the screen)Use the following formula for the conversion.Celsius=5/9 * (Fahrenheit -32)import javax.swing.*;import java.awt.event.*;
class Converter extends JFrame{
Converter(){
super("Converter");setSize(400,400);setVisible(true);setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);setLayout(null);JLabel l1=new JLabel("Enter in Fehrenheit");final JTextField t1=new JTextField(25);JButton b=new JButton("Convert To celsius");JLabel l2=new JLabel("Value in Celsius");final JTextField t2=new JTextField(25);t2.setEditable(false);l1.setBounds(20,50,200,25);t1.setBounds(200,50,200,25);b.setBounds(100,100,150,25);l2.setBounds(20,150,200,25);t2.setBounds(200,150,200,25);b.addActionListener(new ActionListener()
{ public void actionPerformed(ActionEvent e) {try {
double fahrenheit=Double.parseDouble(t1.getText());
System.out.println(fahrenheit);t2.setText(""+0.5555*(fahrenheit-32));
}catch(NumberFormatException nfe)
{ nfe.printStackTrace();}}});
add(l1);add(t1);add(l2);add(t2);add(b);
}public static void main(String a[]){
new Converter();}
}
Q.22. Create an applet which will have three radio buttons for color RED, GREEN, BLUE on selection of a radio button the background color should be change accordingly.
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*<APPLET CODE="choice" WIDTH=400 HEIGHT=400>
</APPLET>*/
public class choice extends Applet implements ItemListener
{
Checkbox cb1,cb2,cb3;
CheckboxGroup cbg=null;
public void init()
{
cbg=new CheckboxGroup();
cb1=new Checkbox("RED",cbg,false);
cb2=new Checkbox("GREEN",cbg,false);
cb3=new Checkbox("YELLOW",cbg,false);
add(cb1); add(cb2); add(cb3);
cb1.addItemListener(this);
cb2.addItemListener(this);
cb3.addItemListener(this);
}
public void itemStateChanged(ItemEvent evt)
{
repaint();
}
public void paint(Graphics g)
{
Checkbox c1=cbg.getSelectedCheckbox();
if(c1.getLabel()=="RED")
setBackground(Color.red);
else if( c1.getLabel() == "GREEN")
setBackground(Color.green);
else if( c1.getLabel() == "YELLOW")
setBackground(Color.yellow);
g.drawString("applet",10,100);
}
}
Output:
Q.23. Write a program to create two threads, one thread will print odd numbers and second thread will print even numbers between 1 to 10.import java.lang.*;import java.util.*;
class even extends Thread{public void run(){for(int i=1;i<=10;i++){if((i%2)==0)System.out.println("Even no. "+i);}}}class odd extends Thread{public void run(){for(int i=1;i<=10;i++){if((i%2)!=0)System.out.println("Odd no. "+i);}}}class Evenodd{public static void main(String[] args){odd od=new odd();even evn=new even();od.start();
evn.start();}}
Q24. (Loan calculator):Write an applet for calculating loan payment, as shown in below Figure. The user can enter the interest rate, the number of years, and the loan amount and click the Compute Payment button to display the monthly payment and total payment.
import java.awt.*;import java.awt.event.*;import java.applet.*;import java.lang.Math;/*<applet code="loan" width=300 height=400>
</applet>*/public class loan extends Applet implements ActionListener{TextField t1,t2,t3,t4,t5;Button b1,b2;Label l1,l2,l3,l4,l5,l6;public void init(){t1=new TextField(15);t2=new TextField(15);t3=new TextField(15);t4=new TextField(15);t5=new TextField(15);b1=new Button("Compute Payment");b2=new Button("Refresh");l1=new Label("interest rate");l2=new Label("years");l3=new Label("loan amount");l4=new Label("monthly payment");l5=new Label("total payment");l6=new Label("enter interest rate,year and loan amount");add(l6); setLayout(new FlowLayout(FlowLayout.LEFT));add(l1); setLayout(new FlowLayout(FlowLayout.RIGHT));add(t1);setLayout(new FlowLayout(FlowLayout.LEFT));add(l2);setLayout(new FlowLayout(FlowLayout.RIGHT));add(t2);setLayout(new FlowLayout(FlowLayout.LEFT));add(l3);setLayout(new FlowLayout(FlowLayout.RIGHT));add(t3);setLayout(new FlowLayout(FlowLayout.LEFT));add(l4);setLayout(new FlowLayout(FlowLayout.RIGHT));add(t4);setLayout(new FlowLayout(FlowLayout.LEFT));add(l5);setLayout(new FlowLayout(FlowLayout.RIGHT));add(t5);setLayout(new FlowLayout(FlowLayout.RIGHT));add(b1); add(b2);t1.addActionListener(this);t2.addActionListener(this);t3.addActionListener(this);t4.addActionListener(this);t5.addActionListener(this);b1.addActionListener(this);b2.addActionListener(this);
}public void actionPerformed(ActionEvent evt){if(evt.getSource() == b1){
double a=Double.parseDouble(t1.getText());double b=Double.parseDouble(t2.getText());double c=Double.parseDouble(t3.getText());double d=c*Math.pow((1+(a/100)),b);t4.setText(""+d);t5.setText(""+(c+d));
}if(evt.getSource() == b2){t1.setText(" ");t2.setText(" ");t3.setText(" ");t4.setText(" ");t5.setText(" ");}}public void paint(Graphics g){g.drawString("interest",300,300);}
}
Q25. An electronic shop has announced the following seasonal discounts on the purchase of certain items
Purchase amount Discount on Laptop Discount of Desktop PC
0-25000 0.0% 5.0%
25001-57000 5.0% 7.5%
57001-100000 7.5% 10.0%
More than 100000 10.0% 15.0%
Design a class electronic having data members as name, address, amount of purchase and the type of purchase(desktop or laptop) . Computer and print the net amountimport java.lang.*;import java.util.*;
class electronics
{String name,address,type;double amount,discount;electronics(){
name=null;address=null;type=null; amount=0.0;discount=0.0;}void compute(String str,double amt){
if(str.equals("Laptop")){
if(amt>=25001 && amt<=57000)discount=amt*(.05);
else if(amt>=57001 && amt<=100000)discount=amt*(7.5/100);
else if(amt>100000) discount=amt*(10.0/100);
}if(str.equals("Desktop PC")){
if(amt>=0 && amt<=25000) discount=amt*(5.0/100);else if(amt>=25001 && amt<=57000)
discount=amt*(7.5/100);else if(amt>=57001 && amt<=100000)
discount=amt*(10.0/100);else if(amt>100000) discount=amt*(15.0/100);
}amount -=discount;System.out.println("total amount for " + str + " is :"+amount);
}
}class elec{
public static void main(String[] args){
Scanner reader=new Scanner(System.in);electronics e=new electronics();System.out.println("enter name");e.name=reader.nextLine();System.out.println("enter address");e.address=reader.nextLine();System.out.println("1. Laptop \n2. Desktop PC\nenter choice for type");int a=reader.nextInt();switch(a){
case 1: e.type="Laptop"; break;case 2: e.type="Desktop PC"; break;default: System.out.println("entered wrong choice"); break;
}System.out.println("enter amount");e.amount=reader.nextDouble();e.compute(e.type,e.amount);
}}
Q26. Write a java program to calculate area of different shape (minimum 5 for eq. – square, rectangle….) by using method overriding concept.
import java.lang.*;import java.util.*;
class square{
double s1;square(double a){s1=a;}double area(){
return s1*s1;}
}
class rectangle extends square{
double s2;rectangle(double a,double b){super(a); s2=b;}double area(){
return s1*s2;}
}class triangle extends square{
double s2;triangle(double a,double b){super(a); s2=b;}double area(){
return s1*s2/2;}
}class circle extends square{
circle(double a){super(a);}double area(){
return 3.14*s1*s1;}
}class rhombus extends square{
double s2;rhombus(double a,double b){super(a); s2=b;}double area(){
return s1*s2/2;}
}
class area
{public static void main(String[] args)
{square s1= new square(15.0);rectangle r1= new rectangle(12.0,13.0);triangle t1= new triangle(8.0,5.0);circle c1= new circle(6.0);rhombus rm1= new rhombus(11.0,9.0);square s2;s2=s1; System.out.println("Area of Square :" +s2.area());s2=r1; System.out.println("Area of rectangle :" +s2.area());s2=t1; System.out.println("Area of triangle :" +s2.area());s2=c1; System.out.println("Area of circle :" +s2.area());s2=rm1; System.out.println("Area of rhombus :" +s2.area());
}}
Q27. Write a program that prompts the user to enter the name of an ASCII text file and display the frequency of the characters in the file.
import java.io.*;class q27{
static int temp[]=new int[255];public static void main(String[] args)
{ FileInputStream fin=null;
char c; try{
fin=new FileInputStream (args[0]);do{
c=(char)fin.read();if(c!='q') temp[c]++;else break;
} while(c!=-1);for(int i=0;i<255;i++){
if(temp[i]>0)System.out.println("char :"+(char)i+" frequency :"+temp[i]);
}
}catch (IOException e) { e.printStackTrace(); }
finally{ try{fin.close();
}catch(IOException e) {}}
}}
Q28. (Creating an investment-value calculator) Write a program that calculates the future value of an investment at a given interest rate for a specified number of years. The formula for the calculation is as follows:
futureValue = investmentAmount * (1 + monthlyInterestRate)years*12
Use text fields for interest rate, investment amount, and years. Display the future amount in a text field when the user clicks the Calculate button, as shown in Figure.