Practical Session 2 Correction Don't forget to put the InputValue.java file in each project

Transcription

1 Practical Session 2 Correction Don't forget to put the InputValue.java file in each project Exercise 1 : Bank Account 1) BankAccount class A bank account is a financial account with a banking institution recording the financial transactions between the customer and the bank and the resulting financial position of the customer with the bank. It is characterized by: An account number (String) The bank customer last name (String) The balance (double) The account class will need constructors (one with no parameter: the balance is set to 0 and the two other attributes are given by the user by the mean of the keyboard, and one with the initial value of the three attributes), the getter & setter methods and several methods such as deposit and withdraw (authorized only if the final balance is positive after withdraw). NB: To allow the user of your program to input the customer last name and the account number by the mean of the keyboard, you can use the InputValue class (don't forget to put it inside your project). // BankAccount class in BankAccount.java public class BankAccount { private String accountnumber; private String customerlastname; private double balance; public BankAccount(){ accountnumber=inputvalue.readstring("give the account number?"); customerlastname = InputValue.readString("Give the customer last name?"); balance=0.0; public BankAccount(String id, String name, double initialbalance){ accountnumber=id; balance=initialbalance; public String getaccountnumber(){ return accountnumber; public String getcustomerlastname(){ return customerlastname; public double getbalance(){ return balance; public void setaccountnumber(string id){ accountnumber = id; public void setcustomerlastname(string name){ public void setbalance(double balanceamount ){ balance = balanceamount; /** Deposits money into the bank amount the amount to deposit**/ public void deposit(double amount){ balance += amount; private boolean withdrawauthorization(double amount){ boolean withdrawok= false; if( balance >=amount) withdrawok=true; return withdrawok; /** Withdraws money from the bank amount the amount to withdraw **/ public void withdraw(double amount){ if(withdrawauthorization(amount)) balance -= amount; System.out.println("Balance account " + (balance)+" is not sufficient to withdraw the amount of"+ " "+ amount);

2 System.out.println("Account number: " +accountnumber); System.out.println("Customer last name: " +customerlastname); System.out.println("Balance: " +balance); // TestBankAccount class in TestBankAccount.java public class TestBankAccount { public static void main(string[] args) { BankAccount account; account = new BankAccount("01456F","Smith",1500); account.deposit(300); account.withdraw(1200); 2) Complete the BankAccount class With a public method called menu, that will print a menu like the following, and allow the user to make his choice. To allow the user of your program to input the value of his choice by the mean of the keyboard, use the InputValue class methods. // BankAccount class in BankAccount.java public class BankAccount { private String accountnumber; private String customerlastname; private double balance; public BankAccount(){ accountnumber=inputvalue.readstring("give the account number?"); customerlastname = InputValue.readString("Give the customer last name?"); balance=0.0; public BankAccount(String id, String name, double initialbalance){ accountnumber=id; balance=initialbalance; public String getaccountnumber(){ return accountnumber; public String getcustomerlastname(){ return customerlastname; public double getbalance(){ return balance; public void setaccountnumber(string id){ accountnumber = id; public void setcustomerlastname(string name){ public void setbalance(double balanceamount ){ balance = balanceamount; /** Deposits money into the bank amount the amount to deposit**/ public void deposit(double amount){ balance += amount; private boolean withdrawauthorization(double amount){ boolean withdrawok= false; if( balance >=amount) withdrawok=true; return withdrawok; /** Withdraws money from the bank amount the amount to withdraw **/ public void withdraw(double amount){ if(withdrawauthorization(amount)) balance -= amount; System.out.println("Balance account " + (balance)+" is not sufficient to withdraw the amount of"+ " "+ amount); System.out.println("Account number: " +accountnumber); System.out.println("Customer last name: " +customerlastname); System.out.println("Balance: " +balance);

3 public void menu(){ int rep =0; do{ System.out.println("************** BANK ACCOUNT MENU *************"); System.out.println("1 ===> Deposit operation"); System.out.println("2 ===> Withdrawal operation "); System.out.println("3 ===> Display bank account information"); System.out.println("4 ===> Quit the program"); System.out.println("********************************************"); rep = InputValue.readInteger("Your choice? "); double amount; switch(rep){ case 1: amount= InputValue.readReal("Amount deposit?"); this.deposit(amount); case 2: amount= InputValue.readReal("Amount withdrawal?"); this.withdraw(amount); case 3: this.display(); case 4: return; default : System.out.println ("\nchoose a right number menu\n "); while(rep!=4); a short example of main function Exercise 2 : Triangle A triangle is characterized by three points (vertices). 1) Implement the class Point A point is characterized by 2 attributes x and y The class should at a minimum have getter methods that return X or Y value, all reasonable constructors, displaycoordinates methods. //File Point.java public class Point{ private double x; private double y; //Constructors public Point(double x, double y){ this.x=x; this.y=y; public Point(){ x=inputvalue.readreal( x coordinate? ); y= InputValue.readReal( y coordinate? );; //Methods public void displaycoordinates(){ System.out.println("X = " + x + " Y = " + y); public double getx(){ return x; public double gety(){ return y; // end Point class

4 Implement the Triangle class. A triangle is characterized by the following attributes : 3 vertices (vertexa, vertexb, vertexc), each point characterized by x,y coordinates The class should at a minimum have all reasonable constructors, isisoscele, isequilateral and displaymethod. Implement the TestTriangle class, that contains the main() method that provides a thorough test of all the class Triangle methods. //File Triangle.java public class Triangle{ private Point pa, pb, pc; //Constructeurs public Triangle(){ pa = new Point(); pb =new Point(); pc = new Point(); public Triangle(Point pa, Point pb, Point pc){ this.pa =pa; this.pb =pb; this.pc =pc; //Méthodes System.out.println("Triangle ABC has the following point coordinates:"); System.out.print("A : "); pa.displaycoordinates(); System.out.print("B : "); pb.displaycoordinates(); System.out.print("C : "); pc.displaycoordinates(); private double computedistance(point p1, Point p2){ double distance = Math.sqrt(Math.pow((p1.getX() p2.getx()),2) +Math.pow((p1.getY() p2.gety()),2)); return distance; private boolean isosceles(){ boolean res; double lengthab = computedistance(pa, pb); System.out.println("AB = " + lengthab); double lengthbc = computedistance(pb,pc); System.out.println("BC = " + lengthbc); double lengthca = computedistance(pc,pa); System.out.println("CA = " + lengthca); if(lengthab == lengthbc lengthab == lengthca lengthbc == lengthca) res =true; res =false; return res; public void isisosceles(){ if(isosceles()) System.out.println("Triangle is isosceles"); System.out.println("Triangle is not isosceles ");

5 private boolean equilateral(){ boolean res; double lengthab = computedistance(pa, pb); System.out.println("AB = " + lengthab); double lengthbc = computedistance(pb,pc); System.out.println("BC = " + lengthbc); double lengthca = computedistance(pc,pa); System.out.println("CA = " + lengthca); if((lengthab == lengthbc) && (lengthbc==lengthca)) res =true; res =false; return res; public void isequilateral(){ if(equilateral()) System.out.println("Triangle is equilateral"); System.out.println("Triangle is not equilateral"); // End Triangle class //File TestTriangle.java public class TestTriangle { public static void main(string[] args) { //1 st constructor test Triangle triangle1 = new Triangle(); triangle1.display(); triangle1.isisosceles(); triangle1.isequilateral(); //2nd constructor test Point pa = new Point(1,1); Point pb = new Point(1,4); Point pc = new Point(5,2); Triangle triangle2 = new Triangle(pA,pB,pC); triangle2.display(); triangle2.isisosceles(); triangle2.isequilateral();