homework1

src/main/java/java3/homework/homework1/Box.java

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+package java3.homework.homework1;
+
+import java3.homework.homework1.fruit.Apple;
+import java3.homework.homework1.fruit.Fruit;
+import java3.homework.homework1.fruit.Orange;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Box<T extends Fruit> {
+    private List<T> fruits;
+    private final Class<T>  type;
+
+    public Class<T> getType() {
+        return type;
+    }
+
+
+    public Box(Class<T> type){
+        this.type = type;
+        fruits = new ArrayList<>();
+    }
+
+
+    public void add(T fruit){
+        fruits.add(fruit);
+    }
+
+    public void moveTo(Box<T> otherBox){
+        fruits.forEach(fruit -> otherBox.add(fruit));
+    }
+
+    public boolean compare(Box<? extends Fruit> otherBox){
+        return otherBox.getWeight() == getWeight();
+    }
+
+    public  float getWeight(){
+        float weight = 0;
+        for(Fruit f:fruits){
+            weight += f.getWeight();
+        }
+        return weight;
+    }
+
+    @Override
+    public String toString() {
+        if(getType()==Apple.class){
+            return ("Box of Apples");
+        }
+
+        if(getType()== Orange.class){
+            return ("Box of Oranges");
+        }
+
+        return  super.toString();
+    }
+
+}

src/main/java/java3/homework/homework1/Main.java

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+package java3.homework.homework1;
+
+import java3.homework.homework1.fruit.Apple;
+import java3.homework.homework1.fruit.Orange;
+
+import java.util.Arrays;
+import java.util.List;
+
+public class Main {
+    public static void main(String[] args) {
+
+        Apple apple = new Apple(1);
+        Orange orange = new Orange(1.5f);
+
+        Box<Apple> b1 = new Box<Apple>(Apple.class);
+        Box<Apple> b2 = new Box<Apple>(Apple.class);
+        Box<Orange> b3 = new Box<Orange>(Orange.class);
+
+        b1.add(apple);
+        b1.moveTo(b2);
+        if (b1.compare(b2) ){
+            System.out.println("b1 = b2");
+        }else if(b1.getWeight()> b2.getWeight()){
+            System.out.println("b1 > b2");
+        }else {
+            System.out.println("b1 < b2");
+        }
+        b3.add(orange);
+
+        if (b1.compare(b3) ){
+            System.out.println("b1 = b3");
+        }else if(b1.getWeight()> b3.getWeight()){
+            System.out.println("b1 > b3");
+        }else {
+            System.out.println("b1 < b3");
+        }
+
+
+
+        Box<?>[] array = {new Box<Apple>(Apple.class), new Box<Apple>(Apple.class), new Box<Orange>(Orange.class)};
+
+        swap(array,0,2);
+        System.out.println(Arrays.toString(array));
+        List<Box> list = arrayToArrayList(array);
+        System.out.println(list);
+
+
+    }
+
+// 1. Написать метод, который меняет два элемента массива местами.
+    public static <Box> void swap(final Box[] arr, final int i, final int j) {
+        Box tmp = arr[i];
+        arr[i] = arr[j];
+        arr[j] = tmp;
+    }
+
+ // 2. Написать метод, который преобразует массив в ArrayList.
+    public static <Box> List<Box> arrayToArrayList(final Box[] arr){
+        return Arrays.asList(arr);
+    }
+}

src/main/java/java3/homework/homework1/fruit/Apple.java

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+package java3.homework.homework1.fruit;
+
+public class Apple extends Fruit {
+
+    public Apple(float weight) {
+        super(weight);
+    }
+}

src/main/java/java3/homework/homework1/fruit/Fruit.java

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+package java3.homework.homework1.fruit;
+
+public abstract class Fruit {
+
+    protected float weight;
+
+    public Fruit(float weight) {
+        this.weight = weight;
+    }
+
+    public float getWeight() {
+        return weight;
+    }
+
+
+
+}

src/main/java/java3/homework/homework1/fruit/Orange.java

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+package java3.homework.homework1.fruit;
+
+public class Orange extends Fruit {
+
+    public Orange(float weight) {
+        super(weight);
+    }
+}