I Am Neo Java week 9

 

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Skill builder

1. Write a program such that it should have three classes, Person and Student and

import java.io.*; import java.util.*; import java.util.Scanner; class Person { protected String firstName; protected String lastName; protected int idNumber; Person(String firstName, String lastName, int identification){ this.firstName = firstName; this.lastName = lastName; this.idNumber = identification; } public void printPerson(){ System.out.println("Name: " + lastName + " " + firstName + "\nID: "+ idNumber); } } class Student extends Person{ private int[] testScores; public Student(String firstName, String lastName, int id, int[] testScores) { super(firstName, lastName, id); this.testScores=testScores; } char calculate() { int i,sum=0,avg; char grade; for(i=0; i<testScores.length; i++) sum+=testScores[i]; avg=sum/testScores.length; if(avg<=100 && avg>=90) grade='O'; else if(avg>=80&&avg<90) grade='E'; else if(avg>=70&&avg<80) grade='A'; else if(avg>=55&&avg<70) grade='P'; else if(avg>=40&&avg<55) grade='D'; else grade='T'; return grade; }} class Main { public static void main(String[] args) { Scanner scan = new Scanner(System.in); String firstName = scan.next(); String lastName = scan.next(); int id = scan.nextInt(); int numScores = scan.nextInt(); int[] testScores = new int[numScores]; for(int i = 0; i < numScores; i++){ testScores[i] = scan.nextInt(); } scan.close(); Student s = new Student(firstName, lastName, id, testScores); s.printPerson(); System.out.println("Grade: " + s.calculate()); }}

2. Write a program to move all the special characters to the end of the string.

Create a class named Demo with the following method. import java.util.Scanner; class Demo{ static String move(String str) { int len = str.length(); String regx = "[a-zA-Z0-9\\s+]"; String res1 = "", res2 = ""; for (int i = 0; i < len; i++) { char c = str.charAt(i); if (String.valueOf(c).matches(regx)) res1 = res1 + c; else res2 = res2 + c; } return res1 + res2; } } class Main extends Demo{ public static void main(String args[]) { String str; Scanner in=new Scanner(System.in); str=in.nextLine(); System.out.println(move(str)); } }

3. Create an abstract class Shape with length, width, radius, 3

import java.util.Scanner; abstract class Shape { private double length, width; //square and rectangle private double radius; //circle private double side1, side2, side3; //triangle //set length and width public void setLengthAndWidth(double l, double w){ length = l; width = w; } //return length public double getLength(){ return length; } //return width public double getWidth(){ return width; } //set radius public void setRadius(double r){ radius = r; } //return radius public double getRadius(){ return radius; } //set sides of triangle public void setSides(double s1, double s2, double s3){ side1 = s1; side2 = s2; side3 = s3; } //// //return side1 public double getSide1(){ return side1; } //return side2 public double getSide2(){ return side2; } //return side3 public double getSide3(){ return side3; } public abstract String toString(); //return String representation of the class public abstract double area(); //calculate area public abstract double perimeter(); //calculate perimeter } //class Circle class Circle extends Shape{ public Circle(double radius){ setRadius(radius); } public Circle(){ //do nothing } //calculate area of circle @Override public double area(){ return Math.PI * Math.pow(getRadius(), 2); } //calculate circumference of circle @Override public double perimeter(){ return 2 * Math.PI * getRadius(); } //return String representation of area @Override public String toString() { return String.format("Circumference : %.2f\nArea : %.2f\n", perimeter(), area()); } } class Rectangle extends Shape{ public Rectangle(double length, double width){ setLengthAndWidth(length, width); } public Rectangle(){ //do nothing } //calculate area @Override public double area(){ return getLength() * getWidth(); } //calculate perimeter @Override public double perimeter(){ return 2 * (getLength() + getWidth()); } //return String representation of area and perimeter @Override public String toString(){ return String.format("Perimeter : %.2f\nArea : %.2f\n", perimeter(), area()); } } class Square extends Shape{ public Square(double l1, double l2){ setLengthAndWidth(l1, l2); } public Square(){ //do nothing } //calculate area @Override public double area(){ return getLength() * getWidth(); } //calculate perimeter @Override public double perimeter(){ return 2 * (getLength() + getWidth()); } //return string representation of perimeter and area @Override public String toString(){ return String.format("Perimeter : %.2f\nArea : %.2f\n",perimeter(),area()); } } class Triangle extends Shape{ public Triangle(double side1, double side2, double side3){ setSides(side1, side2, side3); } public Triangle(){ //do nothing } @Override public double area(){ double p = (1/2.0) * (getSide1() + getSide2() + getSide3()); return Math.sqrt(p * (p-getSide1()) * (p-getSide2()) * (p-getSide3())); } //calculate perimeter @Override public double perimeter(){ return getSide1() + getSide2() + getSide3(); } //return String representation of area and perimeter @Override public String toString(){ return String.format("Perimeter : %.2f\nArea : %.2f", perimeter(), area()); } } class Main { public static void main(String[] args){ Scanner input = new Scanner(System.in); double radius, length, width; char choice = input.nextLine().charAt(0); //System.out.println(choice); switch(choice){ case 'S':case 's': //System.out.println("Enter the length of one side of the square"); length = Double.parseDouble(input.nextLine()); Square square = new Square(length, length); System.out.println(square.toString()); break; case 'R': case 'r': // System.out.println("Enter the length and width of the rectangle"); System.out.println("Enter the length and width of the rectangle"); // System.out.print("Length : "); System.out.print("Length : "); length = Double.parseDouble(input.nextLine()); // System.out.print("Width : "); System.out.print("Width : "); width = Double.parseDouble(input.nextLine()); Rectangle rectangle = new Rectangle(length, width); System.out.println(rectangle.toString()); break; case 'C': case 'c': // System.out.println("Enter radius of the circle"); System.out.println("Enter radius of the circle"); radius = Double.parseDouble(input.nextLine()); Circle circle = new Circle(radius); System.out.println(circle.toString()); break; case 'T': case't': // System.out.println("Enter the length of the sides of the triangle"); System.out.println("Enter the length of the sides of the triangle"); // System.out.print("side1: "); System.out.print("side1: "); double s1 = Double.parseDouble(input.nextLine()); // System.out.print("side2: "); System.out.print("side2: "); double s2 = Double.parseDouble(input.nextLine()); // System.out.print("side3: "); System.out.print("side3: "); double s3 = Double.parseDouble(input.nextLine()); Triangle triangle = new Triangle(s1, s2, s3); System.out.println(triangle.toString()); break; default: // System.out.println("Invalid choice"); System.out.println("Invalid choice"); } input.close(); } }

4. Write a program to implement the following logic using inheritance.

import java.util.Scanner; class Parent1 { void fun(int n) { int i,j,k=0,sum=0; int a[]=new int[10]; while(n!=0) { i=n%10; a[k++]=i; n=n/10; } if(k==1){ System.out.print(a[0]); return; } for(i=0;i<k-1;i++) for(j=i+1;j<k;j++) sum=sum+a[i]+a[j]; System.out.print(sum); } } class Main extends Parent1 { public static void main(String args[]) { int n; Scanner sc=new Scanner(System.in); n=sc.nextInt(); Main t = new Main(); t.fun(n); } }

5. A company maintains a database that has the details of all the employees.

import java.util.Scanner; class Employee { private int id; private float salary; public Employee(int id, float salary) { this.id = id; this.salary = salary; } public int getId() { return id; } public float getSalary() { return salary; } @Override public String toString() { return id + "\n" + salary; } } class EmployeeLevel extends Employee { private int level; public EmployeeLevel(int id, float salary) { super(id, salary); this.level = salary > 100 ? 1 : 2; } public int getLevel() { return level; } @Override public String toString() { return super.toString() + "\n" + level; } } public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); int id = in.nextInt(); float salary = in.nextFloat(); EmployeeLevel el = new EmployeeLevel(id, salary); System.out.println(el); } }

6. Write a program by creating a class Bicycle as a base

import java.util.Scanner; class Bicycle { public int gear; public int speed; public Bicycle(int gear, int speed) { this.gear = gear; this.speed = speed; } public void applyBrake(int decrement) { speed -= decrement; } public void speedUp(int increment) { speed += increment; } // toString() method to print info of Bicycle public String toString() { return("No of gears are "+gear +"\n" + "speed of bicycle is "+speed); } } class MountainBike extends Bicycle { public int seatHeight; public MountainBike(int gear,int speed, int startHeight) { super(gear, speed); seatHeight = startHeight; } public void setHeight(int newValue) { seatHeight = newValue; } @Override public String toString() { return (super.toString()+ "\nseat height is "+seatHeight); } } class Test { public static void main(String args[]) { int gear,speed,startHeight; Scanner sc=new Scanner(System.in); gear=sc.nextInt(); speed=sc.nextInt(); startHeight=sc.nextInt(); MountainBike mb = new MountainBike(gear,speed,startHeight); System.out.println(mb.toString()); } }

7. Overriding-simple

import java.io.*; import java.text.DecimalFormat; import java.util.*; class Event { protected String name; protected String detail; protected String ownerName; public Event(String name, String detail, String ownerName) { this.name = name; this.detail = detail; this.ownerName = ownerName; } public Event() { this.name = null; this.detail = null; this.ownerName = null; } public String getName() { return name; } public void setName(String name) { this.name = name; } public String getDetail() { return detail; } public void setDetail(String detail) { this.detail = detail; } public String getOwnerName() { return ownerName; } public void setOwnerName(String ownerName) { this.ownerName = ownerName; } public Double projectedRevenue() { return 0.0; } } class Exhibition extends Event { public int noOfStall; public Exhibition(String name, String detail, String ownerName, int noOfStall) { super(name,detail,ownerName); this.noOfStall = noOfStall; } public Exhibition() { super(); this.noOfStall = 0; } public int getNoOfStall() { return noOfStall; } public void setNoOfStall(int noOfStall) { this.noOfStall = noOfStall; } public Double projectedRevenue() { return (double) (noOfStall*10000); } } class StageEvent extends Event { public int noOfShows; public int noOfSeatsPerShow; public StageEvent(String name, String detail, String ownerName, int noOfShows, int noOfSeatsPerShow) { super(name,detail,ownerName); this.noOfShows = noOfShows; this.noOfSeatsPerShow = noOfSeatsPerShow; } public StageEvent(){ super(); this.noOfShows = 0; this.noOfSeatsPerShow = 0; } public int getNoOfShows() { return noOfShows; } public void setNoOfShows(int noOfShows) { this.noOfShows = noOfShows; } public int getNoOfSeatsPerShow() { return noOfSeatsPerShow; } public void setNoOfSeatsPerShow(int noOfSeatsPerShow) { this.noOfSeatsPerShow = noOfSeatsPerShow; } public Double projectedRevenue() { return (double) (50*noOfShows*noOfSeatsPerShow); } } class Main { public static void main(String[] args) { Event ev = new Event(); Scanner sc = new Scanner(System.in); ev.name = sc.nextLine(); ev.detail = sc.nextLine(); ev.ownerName = sc.nextLine(); Event e1 = new Event(ev.name,ev.detail,ev.ownerName); int n; DecimalFormat dd = new DecimalFormat("0.0"); n = Integer.parseInt(sc.nextLine()); Exhibition ex = new Exhibition(); StageEvent se = new StageEvent(); if(n==1) { ex.noOfStall = Integer.parseInt(sc.nextLine()); Exhibition ex1 = new Exhibition(ev.name,ev.detail,ev.ownerName,ex.noOfStall); double result = ex1.projectedRevenue(); System.out.println(dd.format(result)); } if(n==2) { se.noOfShows = Integer.parseInt(sc.nextLine()); se.noOfSeatsPerShow = Integer.parseInt(sc.nextLine()); StageEvent se1 = new StageEvent(ev.name,ev.detail,ev.ownerName,se.noOfShows,se.noOfSeatsPerShow); double result = se1.projectedRevenue(); System.out.println(dd.format(result)); } } }

8. Given a Book class and the Main class, write a MyBook class that does the following:

import java.util.Scanner; class Main { public static void main(String[] args) { Scanner sc=new Scanner(System.in); String title =sc.nextLine(); String author =sc.nextLine(); int price = sc.nextInt(); Book book = new MyBook(title, author, price); book.display(); } } abstract class Book { String title; String author; Book(String title, String author) { this.title = title; this.author = author; } abstract void display(); } class MyBook extends Book { int price; MyBook(String title,String author,int price) { super(title,author); this.price=price; } void display() { System.out.println("Title: "+title); System.out.println("Author: "+author); System.out.println("Price: "+price); } }

Challange yourself

1. Whether you fly for business or leisure purposes, you can choose either private jets or commercial airlines to get from point A to point B.

import java.util.*; class m{ public static void main(String ar[]){ Scanner sc = new Scanner(System.in); String Aname = sc.nextLine(); String source= sc.nextLine(); String desti = sc.nextLine(); int n = sc.nextInt(); if(n==1){ int kg = sc.nextInt(); int extra = sc.nextInt(); String s = "Public Aircraft"; System.out.println("Aircraft Type : "+s); System.out.println("Aircraft Name : "+Aname); System.out.println("Source : "+source); System.out.println("Destination : "+desti); System.out.println("Check in before two hours : Yes"); System.out.println("Number of kgs allowed per person : "+kg); System.out.println("Additional fee charged for extra baggage per Kg : "+extra+".0"); } else{ String pname = sc.nextLine(); String purpose = sc.nextLine(); String k = "Private Aircraft"; System.out.println("Aircraft Type : "+k); System.out.println("Aircraft Name : "+Aname); System.out.println("Source : "+source); System.out.println("Destination : "+desti); System.out.println("Check in before two hours : No"); System.out.println("Pilot Name : "+pname); System.out.println("Purpose :"+purpose); } }}

2. Write a Java program to implement the following class diagram.

import java.io.*; import java.util.*; import java.text.*; class Circle { // private instance variable, not accessible from outside this class private double radius; private String color; // 1st constructor, which sets both radius and color to default public Circle() { radius = 1.0; color = "red"; } // 2nd constructor with given radius, but color default public Circle(double radius) { this.radius = radius; color = "red"; } public Circle(double radius, String color) { this.radius = radius; this.color = color; } // A public method for retrieving the radius public double getRadius() { return radius; } public void setRadius(double radius) { this.radius = radius; } public void setColor(String color) { this.color = color; } // A public method for computing the area of circle public double getArea() { return radius*radius*Math.PI; } public String getColor() { return color; } @Override public String toString() { return "Circle: radius=" + radius + " color=" + color; } } class Cylinder extends Circle { //save as "Cylinder.java" private double height; // private variable //private double radius; // Constructor with default color, radius and height public Cylinder() { super(); // call superclass no-arg constructor Circle() height = 1.0; } // Constructor with default radius, color but given height public Cylinder(double height) { super(); // call superclass no-arg constructor Circle() this.height = height; } // Constructor with default color, but given radius, height public Cylinder(double radius, double height) { super(radius); // call superclass constructor Circle(r) this.height = height; } // A public method for retrieving the height public double getHeight() { return height; } public void setHeight(double h) { this.height = h; } // A public method for computing the volume of cylinder // use superclass method getArea() to get the base area public double getVolume() { return super.getArea()*height; } @Override public double getArea() { return (2*Math.PI*getRadius()*height) + (2*getRadius()*getRadius()*Math.PI); } @Override public String toString() { return "Cylinder: radius=" + getRadius() + " color=" + getColor() + " height=" + getHeight(); } } class Main { public static void main(String [] args) { DecimalFormat d = new DecimalFormat("0.00"); Scanner sc = new Scanner(System.in); Circle c1 = new Circle(); Cylinder c2 = new Cylinder(); c1.setRadius(sc.nextDouble()); c2.setHeight(sc.nextDouble()); System.out.println(c1); System.out.println(c2); System.out.println(d.format(c1.getArea())); System.out.println(d.format(c2.getArea())); System.out.println(d.format(c2.getVolume())); }

3. Account Details

import java.io.*; import java.util.*; class Account { protected String accountNumber; protected double balance; protected String accountHoldername; public String getAccountNumber() { return accountNumber; } public void setAccountNumber(String accountNumber) { this.accountNumber = accountNumber; } public double getBalance() { return balance; } public void setBalance(double balance) { this.balance = balance; } public String getAccountHoldername() { return accountHoldername; } public void setAccountHoldername(String accountHoldername) { this.accountHoldername = accountHoldername; } } class SavingAccount extends Account { protected double minimumBalance; public double getMinimumBalance() { return minimumBalance; } public void setMinimumBalance(double minimumBalance) { this.minimumBalance = minimumBalance; } } class FixedAccount extends SavingAccount { private int lockingPeriod; public int getLockingPeriod() { return lockingPeriod; } public void setLockingPeriod(int lockingPeriod) { this.lockingPeriod = lockingPeriod; } } class AccountBO { public void getAccountDetail(String detail) { String [] bank = detail.split(","); System.out.format("%-20s %-10s %-20s %-20s %s\n","Account Number","Balance","Account holder name","Minimum balance","Locking period"); System.out.format("%-20s %-10s %-20s %-20s %s\n",bank[0],bank[1],bank[2],bank[3],bank[4]); } } class Main { public static void main(String [] args) { String detail; Scanner sc = new Scanner(System.in); detail = sc.nextLine(); AccountBO ab = new AccountBO(); ab.getAccountDetail(detail); } }