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Diff for: ‎1. Exercises on Classes/Account.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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/**
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*
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* @author GIA KINH
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*/
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public class Account {
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private String id;
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private String name;
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private int balance;
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public Account(String id, String name) {
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this.id = id;
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this.name = name;
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}
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public Account(String id, String name, int balance) {
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this.id = id;
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this.name = name;
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this.balance = balance;
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}
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public String getID() {
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return id;
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}
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public void setID(String id) {
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this.id = id;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public int getBalance() {
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return balance;
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}
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public void setBalance(int balance) {
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this.balance = balance;
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}
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public int credit(int amount){
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this.balance += amount;
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return this.balance;
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}
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public int debit(int amount){
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if(amount<=this.balance){
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this.balance-=amount;
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}else{
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System.out.println("Amount exceeded balance");
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}
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return this.balance;
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}
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public int transferTo(Account account, int amount){
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if(amount<=this.balance){
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account.balance += amount;
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this.balance -= amount;
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}else{
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System.out.println("Amount exceeded balance");
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}
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return this.balance;
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}
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@Override
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public String toString() {
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return "Account[" + "id=" + id + ",name=" + name + ",balance=" + balance + ']';
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}
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}
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class TestAccount {
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public static void main(String[] args) {
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// Test constructor and toString()
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Account a1 = new Account("A101", "Tan Ah Teck", 88);
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System.out.println(a1); // toString();
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Account a2 = new Account("A102", "Kumar"); // default balance
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System.out.println(a2);
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// Test Getters
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System.out.println("ID: " + a1.getID());
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System.out.println("Name: " + a1.getName());
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System.out.println("Balance: " + a1.getBalance());
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// Test credit() and debit()
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a1.credit(100);
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System.out.println(a1);
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a1.debit(50);
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System.out.println(a1);
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a1.debit(500); // debit() error
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System.out.println(a1);
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// Test transfer()
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a1.transferTo(a2, 100); // toString()
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System.out.println(a1);
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System.out.println(a2);
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}
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}

Diff for: ‎1. Exercises on Classes/Ball.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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/**
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*
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* @author GIA KINH
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*/
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public class Ball {
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private float x;
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private float y;
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private int radius;
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private float xDelta;
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private float yDelta;
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public Ball(float x, float y, int radius, float xDelta, float yDelta) {
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this.x = x;
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this.y = y;
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this.radius = radius;
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this.xDelta = xDelta;
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this.yDelta = yDelta;
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}
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public float getX() {
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return x;
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}
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public void setX(float x) {
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this.x = x;
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}
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public float getY() {
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return y;
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}
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public void setY(float y) {
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this.y = y;
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}
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public int getRadius() {
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return radius;
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}
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public void setRadius(int radius) {
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this.radius = radius;
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}
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public float getXDelta() {
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return xDelta;
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}
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public void setXDelta(float xDelta) {
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this.xDelta = xDelta;
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}
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public float getYDelta() {
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return yDelta;
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}
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public void setYDelta(float yDelta) {
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this.yDelta = yDelta;
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}
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public void move(){
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this.x += this.xDelta;
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this.y += this.yDelta;
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}
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public void reflectHorizontal(){
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this.xDelta = -this.xDelta;
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}
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public void reflectVertical(){
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this.yDelta = -this.yDelta;
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}
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@Override
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public String toString() {
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return "Ball[("+ x+ "," + y + "),speed=(" + xDelta + "," + yDelta + ")]";
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}
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}
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class TestMain {
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public static void main(String[] args) {
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// Test constructor and toString()
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Ball ball = new Ball(1.1f, 2.2f, 10, 3.3f, 4.4f);
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System.out.println(ball); // toString()
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// Test Setters and Getters
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ball.setX(80.0f);
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ball.setY(35.0f);
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ball.setRadius(5);
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ball.setXDelta(4.0f);
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ball.setYDelta(6.0f);
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System.out.println(ball); // toString()
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System.out.println("x is: " + ball.getX());
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System.out.println("y is: " + ball.getY());
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System.out.println("radius is: " + ball.getRadius());
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System.out.println("xDelta is: " + ball.getXDelta());
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System.out.println("yDelta is: " + ball.getYDelta());
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// Bounce the ball within the boundary
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float xMin = 0.0f;
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float xMax = 100.0f;
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float yMin = 0.0f;
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float yMax = 50.0f;
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for (int i = 0; i < 15; i++) {
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ball.move();
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System.out.println(ball);
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float xNew = ball.getX();
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float yNew = ball.getY();
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int radius = ball.getRadius();
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// Check boundary value to bounce back
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if ((xNew + radius) > xMax || (xNew - radius) < xMin) {
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ball.reflectHorizontal();
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}
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if ((yNew + radius) > yMax || (yNew - radius) < yMin) {
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ball.reflectVertical();
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}
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}
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}
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}

Diff for: ‎1. Exercises on Classes/Circle.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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/**
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*
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* @author GIA KINH
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*/
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public class Circle {
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private double radius;
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public Circle() {
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radius = 1.0;
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}
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public Circle(double radius) {
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this.radius = radius;
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}
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public double getRadius() {
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return radius;
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}
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public void setRadius(double radius) {
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this.radius = radius;
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}
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public double getArea() {
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return radius*radius*Math.PI;
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}
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public double getCircumference(){
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return radius*2*Math.PI;
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}
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@Override
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public String toString() {
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return "Circle[" + "radius=" + radius + ']';
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}
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}
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class TestCircle{
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public static void main(String[] args) {
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// Test Constructors and toString()
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Circle c1 = new Circle(1.1);
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System.out.println(c1); // toString()
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Circle c2 = new Circle(); // default constructor
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System.out.println(c2);
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// Test setter and getter
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c1.setRadius(2.2);
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System.out.println(c1); // toString()
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System.out.println("radius is: " + c1.getRadius());
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// Test getArea() and getCircumference()
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System.out.printf("area is: %.2f%n", c1.getArea());
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System.out.printf("circumference is: %.2f%n", c1.getCircumference());
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}
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}
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Diff for: ‎1. Exercises on Classes/Date.java

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/*
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* To change this license header, choose License Headers in Project Properties.
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* To change this template file, choose Tools | Templates
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* and open the template in the editor.
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*/
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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/**
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*
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* @author GIA KINH
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*/
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public class Date {
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private int day;
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private int month;
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private int year;
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public Date(int day, int month, int year) {
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this.day = day;
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this.month = month;
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this.year = year;
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}
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public int getDay() {
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return day;
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}
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public void setDay(int day) {
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this.day = day;
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}
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public int getMonth() {
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return month;
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}
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public void setMonth(int month) {
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this.month = month;
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}
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public int getYear() {
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return year;
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}
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public void setYear(int year) {
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this.year = year;
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}
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public void setDate(int day, int month, int year) {
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this.day = day;
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this.month = month;
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this.year = year;
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}
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@Override
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public String toString() {
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String dateString = String.format("%d-%d-%d", year, month, day);
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java.util.Date date = null;
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try {
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date = new SimpleDateFormat("yyyy-MM-dd").parse(dateString);
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} catch (ParseException ex) {
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Logger.getLogger(Date.class.getName()).log(Level.SEVERE, null, ex);
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}
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String newstring = new SimpleDateFormat("dd/MM/yyyy").format(date);
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return newstring;
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}
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}
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class TestDate {
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public static void main(String[] args) {
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// Test constructor and toString()
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Date d1 = new Date(1, 2, 2014);
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System.out.println(d1); // toString()
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// Test Setters and Getters
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d1.setMonth(12);
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d1.setDay(9);
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d1.setYear(2099);
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System.out.println(d1); // toString()
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System.out.println("Month: " + d1.getMonth());
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System.out.println("Day: " + d1.getDay());
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System.out.println("Year: " + d1.getYear());
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// Test setDate()
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d1.setDate(3, 4, 2016);
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System.out.println(d1); // toString()
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}
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}

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