Java3 lesson1 homework.

src/lesson1/task1/ArrayItems.java

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+
+package lesson1.task1;
+
+import java.util.Arrays;
+
+public class ArrayItems {
+
+    public static void main(String[] args) {
+        Object [] array = new Object[5];
+        array[0]="one";
+        array[1]=2.0f;
+        array[2]=3;
+        array[3]=4L;
+        array[4]='\u01BC';
+        ArrayItems test = new ArrayItems();
+
+        System.out.println(Arrays.toString(array));
+        test.swap(0,2,array);
+        System.out.println(Arrays.toString(array));
+        test.swap(4,2,array);
+        System.out.println(Arrays.toString(array));
+
+    }
+
+    public void swap(int index1, int index2, Object [] array){
+
+        Object temp = array[index1];
+        array[index1] = array[index2];
+        array[index2] = temp;
+    }
+}

src/lesson1/task2/ArrayToArrayList.java

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+package lesson1.task2;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class ArrayToArrayList<T> {
+
+    public ArrayList<T> arrayToArrayList(T...array){
+        ArrayList<T> result = new ArrayList<>(Arrays.asList(array));
+        return result;
+    }
+    public static void main(String[] args) {
+        ArrayToArrayList<String> str = new ArrayToArrayList<String>();
+        System.out.println(str.arrayToArrayList("1","2","3","4","5").size());
+        // Методом .size я проверил, что результат метода arrayToArrayList - ArrayList
+        // т.к. у Array определение длины выполняет метод .length
+    }
+}

src/lesson1/task3/Apple.java

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+package lesson1.task3;
+
+public class Apple extends Fruit{
+
+    public Apple() {
+        super(1.0f);
+    }
+
+    @Override
+    public float getWeight() {
+        return weight;
+    }
+
+}

src/lesson1/task3/Fruit.java

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+package lesson1.task3;
+
+public abstract class Fruit {
+    float weight;
+
+    public abstract float getWeight();
+
+    public Fruit(float weight) {
+        this.weight = weight;
+    }
+
+}

src/lesson1/task3/FruitBox.java

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+package lesson1.task3;
+
+import com.sun.org.apache.xerces.internal.impl.xpath.regex.Match;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+
+public class FruitBox<T extends Fruit> {
+    ArrayList<T> fruitBox = new ArrayList<>();
+
+    public FruitBox(T...fruits){
+        fruitBox = new ArrayList<>(Arrays.asList(fruits));
+    }
+
+    public ArrayList<T> getFruitBox() {
+        return fruitBox;
+    }
+
+    public void addFruit (T fruit){
+        fruitBox.add(fruit);
+    }
+
+    public float getBoxWeight(){
+        float boxWeight = 0f;
+
+        for (int i = 0; i< fruitBox.size(); i++) {
+            boxWeight += fruitBox.get(i).getWeight();
+        }
+        return boxWeight;
+    }
+
+    public boolean compare (FruitBox<? extends Fruit> anotherBox){
+        return Math.abs(this.getBoxWeight()-anotherBox.getBoxWeight()) < 0.0001f;
+    }
+
+    public void repackFruits (FruitBox<T> anotherBox){
+        anotherBox.fruitBox.addAll(this.fruitBox);
+        this.fruitBox.clear();
+    }
+
+}

src/lesson1/task3/Main.java

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+package lesson1.task3;
+
+public class Main {
+    public static void main(String[] args) {
+
+        FruitBox<Apple> appleFruitBox = new FruitBox<>(new Apple(),new Apple(), new Apple(), new Apple(), new Apple());
+        FruitBox<Orange> orangeFruitBox = new FruitBox<>(new Orange(), new Orange(), new Orange(),new Orange());
+
+        System.out.println("The box of apples weight is " + appleFruitBox.getBoxWeight());
+        System.out.println("The box of oranges weight is " +orangeFruitBox.getBoxWeight());
+        System.out.println("Is the boxes weigh the same? - " + appleFruitBox.compare(orangeFruitBox));
+        System.out.println("-------------------------------------");
+
+        FruitBox<Apple> appleFruitBox2 = new FruitBox<>();
+        FruitBox<Orange> orangeFruitBox2 = new FruitBox<>();
+
+        appleFruitBox.repackFruits(appleFruitBox2);
+        orangeFruitBox.repackFruits(orangeFruitBox2);
+        System.out.println("The 1st box of apples weight is " + appleFruitBox.getBoxWeight());
+        System.out.println("The 2nd box of apples weight is " + appleFruitBox2.getBoxWeight());
+        System.out.println("-------------------------------------");
+        System.out.println("The 1st box of oranges weight is " +orangeFruitBox.getBoxWeight());
+        System.out.println("The 2nd box of oranges weight is " +orangeFruitBox2.getBoxWeight());
+
+    }
+}

src/lesson1/task3/Orange.java

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+package lesson1.task3;
+
+public class Orange extends Fruit{
+
+
+    public Orange() {
+        super(1.5f);
+    }
+
+    @Override
+    public float getWeight() {
+        return weight;
+    }
+}