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Merge pull request #7 from formidablae/1-what-are-classes-objects-and-methods/1.2-learn-java-methods
Did 1 What are Classes Objects and Methods / 1.2 Learn Java Methods
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‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.1_Introduction/SavingsAccount.java

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public class SavingsAccount {
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int balance;
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public SavingsAccount(int initialBalance){
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balance = initialBalance;
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}
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public static void main(String[] args){
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SavingsAccount savings = new SavingsAccount(2000);
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//Check balance:
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System.out.println("Hello!");
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System.out.println("Your balance is "+savings.balance);
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//Withdrawing:
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int afterWithdraw = savings.balance - 300;
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savings.balance = afterWithdraw;
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System.out.println("You just withdrew "+300);
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//Check balance:
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System.out.println("Hello!");
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System.out.println("Your balance is "+savings.balance);
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//Deposit:
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int afterDeposit = savings.balance + 600;
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savings.balance = afterDeposit;
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System.out.println("You just deposited "+600);
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//Check balance:
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System.out.println("Hello!");
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System.out.println("Your balance is "+savings.balance);
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//Deposit:
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int afterDeposit2 = savings.balance + 600;
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savings.balance = afterDeposit2;
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System.out.println("You just deposited "+600);
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//Check balance:
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System.out.println("Hello!");
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System.out.println("Your balance is "+savings.balance);
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.2_Defining_Methods/LETest.java

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import java.io.ByteArrayOutputStream;
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import java.io.PrintStream;
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import org.junit.Test;
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import org.junit.Before;
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import org.junit.After;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertThat;
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import static org.hamcrest.CoreMatchers.instanceOf;
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import static org.hamcrest.CoreMatchers.containsString;
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public class LETest {
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private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
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private final ByteArrayOutputStream errContent = new ByteArrayOutputStream();
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private final PrintStream originalOut = System.out;
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private final PrintStream originalErr = System.err;
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@Before
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public void setUpStreams() {
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System.setOut(new PrintStream(outContent));
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System.setErr(new PrintStream(errContent));
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}
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@After
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public void restoreStreams() {
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System.setOut(originalOut);
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System.setErr(originalErr);
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}
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@Test
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public void someTest() {
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String expected = "Hello world!";
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Store store = new Store("Lemonade");
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store.advertise();
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assertThat("Does your code print 'Hello World!'?", outContent.toString(), containsString(expected));
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.2_Defining_Methods/Store.java

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public class Store {
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// instance fields
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String productType;
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// constructor method
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public Store(String product) {
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productType = product;
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}
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// advertise method
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public void advertise() {
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System.out.println("Come spend some money!");
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System.out.println("Selling " + productType + "!");
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}
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// main method
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public static void main(String[] args) {
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.3_Calling_Methods/Store.java

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public class Store {
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// instance fields
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String productType;
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// constructor method
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public Store(String product) {
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productType = product;
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}
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// advertise method
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public void advertise() {
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System.out.println("Selling " + productType + "!");
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System.out.println("Come spend some money!");
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}
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// main method
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public static void main(String[] args) {
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Store lemonadeStand = new Store("Lemonade");
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lemonadeStand.advertise();
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lemonadeStand.advertise();
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lemonadeStand.advertise();
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.4_Scope/Store.java

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public class Store {
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// instance fields
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String productType;
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// constructor method
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public Store(String product) {
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productType = product;
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}
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// advertise method
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public void advertise() {
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String message = "Selling " + productType + "!";
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System.out.println(message);
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}
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// main method
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public static void main(String[] args) {
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String cookie = "Cookies";
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Store cookieShop = new Store(cookie);
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cookieShop.advertise();
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.5_Adding_Parameters/Store.java

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public class Store {
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// instance fields
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String productType;
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// constructor method
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public Store(String product) {
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productType = product;
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}
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// advertise method
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public void advertise() {
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String message = "Selling " + productType + "!";
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System.out.println(message);
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}
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public void greetCustomer(String customer) {
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System.out.println("Welcome to the store, " + customer + "!");
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}
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// main method
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public static void main(String[] args) {
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Store lemonadeStand = new Store("Lemonade");
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lemonadeStand.greetCustomer("Kate");
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.6_Reassigning_Instance_Fields/LETest.java

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import static org.junit.Assert.assertEquals;
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import org.junit.Test;
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public class LETest {
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@Test
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public void increasesPriceByOne() {
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Store store = new Store("Lemonade", 1);
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store.increasePrice(1);
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double expected = 2;
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double actual = store.price;
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assertEquals("We tested increasing the price by 1 for a store with a starting price of 1, and got the wrong price!", expected, actual, 0.05);
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}
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@Test
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public void increasesPriceByTen() {
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Store store = new Store("Lemonade", 1);
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store.increasePrice(10);
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double expected = 11;
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double actual = store.price;
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assertEquals("We tested increasing the price by 10 for a store with a starting price of 1, and got the wrong price!", expected, actual, 0.05);
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.6_Reassigning_Instance_Fields/Store.java

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public class Store {
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// instance fields
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String productType;
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double price;
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// constructor method
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public Store(String product, double initialPrice) {
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productType = product;
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price = initialPrice;
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}
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// increase price method
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public void increasePrice(double priceToAdd){
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double newPrice = price + priceToAdd;
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price = newPrice;
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}
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// main method
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public static void main(String[] args) {
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Store lemonadeStand = new Store("Lemonade", 3.75);
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lemonadeStand.increasePrice(1.5);
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System.out.println(lemonadeStand.price);
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.7_Returns/Store.java

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public class Store {
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// instance fields
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String productType;
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double price;
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// constructor method
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public Store(String product, double initialPrice) {
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productType = product;
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price = initialPrice;
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}
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// increase price method
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public void increasePrice(double priceToAdd){
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double newPrice = price + priceToAdd;
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price = newPrice;
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}
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// get price with tax method
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public double getPriceWithTax(){
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double tax = 0.08;
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double totalPrice = price + price * tax;
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return totalPrice;
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}
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// main method
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public static void main(String[] args) {
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Store lemonadeStand = new Store("Lemonade", 3.75);
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lemonadeStand.getPriceWithTax()
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.8_The_toString_Method/Store.java

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public class Store {
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// instance fields
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String productType;
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double price;
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// constructor method
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public Store(String product, double initialPrice) {
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productType = product;
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price = initialPrice;
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}
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// increase price method
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public void increasePrice(double priceToAdd){
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double newPrice = price + priceToAdd;
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price = newPrice;
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}
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// get price with tax method
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public double getPriceWithTax(){
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double tax = 0.08;
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double totalPrice = price + price*tax;
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return totalPrice;
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}
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// toString method
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public String toString() {
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return "This store sells " + productType + " at a price of " + price + ".";
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}
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// main method
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public static void main(String[] args) {
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Store lemonadeStand = new Store("Lemonade", 3.75);
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Store cookieShop = new Store("Cookies", 5);
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System.out.println(lemonadeStand);
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System.out.println(cookieShop);
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}
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}

‎1_What_are_Classes_Objects_and_Methods/1.2_Learn_Java_Methods/1.2.9_Review/LETest.java

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import java.io.ByteArrayOutputStream;
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import java.io.PrintStream;
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import org.junit.Test;
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import org.junit.Before;
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import org.junit.After;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertThat;
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import static org.hamcrest.CoreMatchers.instanceOf;
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import static org.hamcrest.CoreMatchers.containsString;
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public class LETest {
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private final ByteArrayOutputStream outContent = new ByteArrayOutputStream();
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private final ByteArrayOutputStream errContent = new ByteArrayOutputStream();
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private final PrintStream originalOut = System.out;
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private final PrintStream originalErr = System.err;
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@Before
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public void setUpStreams() {
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System.setOut(new PrintStream(outContent));
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System.setErr(new PrintStream(errContent));
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}
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@After
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public void restoreStreams() {
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System.setOut(originalOut);
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System.setErr(originalErr);
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}
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@Test
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public void checkHello() {
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String expected = "Hello!";
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SavingsAccount savingsTest = new SavingsAccount(2000);
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savingsTest.checkBalance();
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assertThat("Does your `checkBalance()` method print \"Hello!\"?", outContent.toString(), containsString(expected));
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}
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@Test
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public void checkYourBalanceIs() {
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String expected = "Your balance is 2000";
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SavingsAccount savingsTest = new SavingsAccount(2000);
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savingsTest.checkBalance();
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assertThat("Does your `checkBalance()` method print \"Your balance is \" + balance?", outContent.toString(), containsString(expected));
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}
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}

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