LabWeek3

LabWeek3/.gitignore

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+target/
+!.mvn/wrapper/maven-wrapper.jar
+!**/src/main/**/target/
+!**/src/test/**/target/
+.kotlin
+
+### IntelliJ IDEA ###
+.idea/modules.xml
+.idea/jarRepositories.xml
+.idea/compiler.xml
+.idea/libraries/
+*.iws
+*.iml
+*.ipr
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+build/
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

LabWeek3/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.workshop</groupId>
+    <artifactId>LabWeek3</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>25</maven.compiler.source>
+        <maven.compiler.target>25</maven.compiler.target>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+</project>

LabWeek3/src/main/java/BigDecimalExercise.java

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+
+double round(BigDecimal num){
+    MathContext m = new MathContext(3);
+    BigDecimal rounded = num.round(m);
+    return  rounded.doubleValue();
+}
+double p2(BigDecimal num){
+    MathContext m = new MathContext(2);
+    BigDecimal rounded = num.round(m);
+    rounded = rounded.multiply(new BigDecimal("-1"));
+    return  rounded.doubleValue();
+}
+
+
+
+
+void main() {
+    BigDecimal b1 = new BigDecimal("4.2585");
+    double result = round(b1);
+    System.out.println("Rounded: " + result);
+
+    result = p2(b1);
+    System.out.println("Rounded and flipped: " + result);
+}
+
+

LabWeek3/src/main/java/CarSystem.java

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+public abstract class Car{
+  private String vinNumber;
+  private String make;
+  private String model;
+  private int mileage;
+
+    public Car(String vinNumber, String make, String model, int mileage) {
+        this.vinNumber = vinNumber;
+        this.make = make;
+        this.model = model;
+        this.mileage = mileage;
+    }
+
+    public String getInfo(){
+    return  "vinNumber: "+ vinNumber
+            + " make: " + make + " model: "
+            +model+" mileage: "+mileage;
+  }
+
+}
+
+public class Sedan extends Car {
+  public Sedan(String vinNumber, String make, String model, int mileage) {
+    super(vinNumber, make, model, mileage);
+  }
+}
+public class UtilityVehicle extends Car{
+  private boolean fourWheelDrive;
+
+    public UtilityVehicle(String vinNumber, String make, String model, int mileage, boolean fourWheelDrive) {
+        super(vinNumber, make, model, mileage);
+        this.fourWheelDrive= fourWheelDrive;
+    }
+}
+public class Truck extends Car{
+  private double towingCapacity;
+
+    public Truck(String vinNumber, String make, String model, int mileage, double towingCapacity) {
+        super(vinNumber, make, model, mileage);
+        this.towingCapacity = towingCapacity;
+    }
+}
+
+
+
+
+void main() {
+
+}

LabWeek3/src/main/java/IntListInterface.java

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+public interface IntList{
+    void add(int number);
+    int  get(int id) throws Exception;
+}
+public class IntArrayList implements IntList{
+    private int[] nums;
+    private int capacity = 10;
+    private int elements = 0;
+
+    public IntArrayList() {
+        this.nums = new int[capacity];
+    }
+
+    @Override
+    public void add(int number) {
+        if (elements == capacity) {
+            int new_capacity = (int) Math.floor(capacity * 1.5);
+            int[] new_nums = new int[new_capacity];
+            for(int i = 0; i < elements; ++i) {
+                new_nums[i] = nums[i];
+            }
+            this.nums = new_nums;
+            this.capacity = new_capacity;
+        }
+        this.nums[elements] = number;
+        this.elements++;
+    }
+
+    @Override
+    public int get(int id) throws Exception {
+        if (id < elements) {
+            return nums[id];
+        }
+        throw new Exception("not enough elements");
+    }
+}
+
+
+public class IntVector implements IntList{
+    private int[] nums;
+    private int capacity = 20;
+    private int elements = 0;
+
+    public IntVector() {
+        this.nums = new int[capacity];
+    }
+
+    @Override
+    public void add(int number) {
+        if (elements == capacity) {
+            int new_capacity = capacity * 2;
+            int[] new_nums = new int[new_capacity];
+            for(int i = 0; i < elements; ++i) {
+                new_nums[i] = nums[i];
+            }
+            this.nums = new_nums;
+            this.capacity = new_capacity;
+        }
+        this.nums[elements] = number;
+        this.elements++;
+    }
+
+    @Override
+    public int get(int id) throws Exception {
+        if (id < elements) {
+            return nums[id];
+        }
+        throw new Exception("not enough elements");
+    }
+
+}
+
+
+
+
+
+void main() {
+    IntList my_list = new IntArrayList();
+    for (int i = 0; i < 14; ++i) {
+        my_list.add(i);
+    }
+    try {
+        int elem = my_list.get(13);
+        System.out.println(elem);
+    } catch (Exception e) {
+        throw new RuntimeException(e);
+    }
+
+    my_list = new IntVector();
+    for (int i = 0; i < 14; ++i) {
+        my_list.add(i);
+    }
+    try {
+        int elem = my_list.get(13);
+        System.out.println(elem);
+    } catch (Exception e) {
+        throw new RuntimeException(e);
+    }
+}

LabWeek3/src/main/java/VideoStreamingService.java

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+public abstract class Video{
+    private String title;
+    private int duration;
+
+    public Video(String title, int duration) {
+        this.title = title;
+        this.duration = duration;
+    }
+
+    public String getInfo(){
+        return  "title: "+ title + " duration: " + duration;
+    }
+
+}
+
+public class TvSeries extends Video{
+    private int episodes;
+
+    public TvSeries(String title, int duration, int episodes) {
+        super(title, duration);
+        this.episodes = episodes;
+    }
+}
+public class Movie extends Video{
+    private double rating;
+
+    public Movie(String title, int duration,double rating) {
+        super(title, duration);
+        this.rating = rating;
+    }
+}
+
+
+
+
+
+void main() {
+
+}