java3 lesson1 v1.0 2020-01-30 22-04

java3/lesson1/nbactions.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<actions>
+        <action>
+            <actionName>run</actionName>
+            <packagings>
+                <packaging>jar</packaging>
+            </packagings>
+            <goals>
+                <goal>process-classes</goal>
+                <goal>org.codehaus.mojo:exec-maven-plugin:1.5.0:exec</goal>
+            </goals>
+            <properties>
+                <exec.args>-classpath %classpath javacore.lesson1.Tests</exec.args>
+                <exec.executable>java</exec.executable>
+            </properties>
+        </action>
+    </actions>

java3/lesson1/pom.xml

@@ -0,0 +1,13 @@
+<?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>javacore</groupId>
+    <artifactId>lesson1</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+</project>

java3/lesson1/src/main/java/javacore/lesson1/Task1.java

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+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1;
+
+import java.util.ArrayList;
+
+/**
+ *
+ * @author igor
+ */
+public class Task1 <T extends Object> {
+    public T[] changeAB(T[] array) {
+        if(array == null || array.length != 2) {
+            return null;
+        }
+        T[] arrayReverse = array.clone();
+        arrayReverse[0] = array[1];
+        arrayReverse[1] = array[0];
+        return arrayReverse;
+    }
+    public String print(T[] array) {
+        String resultString = "";
+        for(T t : array) {
+            resultString += t + ", "; 
+        }
+        return resultString;
+    }
+    public void test() {
+        System.out.println("Test started! Task1.\n");
+
+        Task1 mainObject = new Task1();
+
+        String[] arrayStrings = new String[2];
+        arrayStrings[0] = "Первая строка";
+        arrayStrings[1] = "Вторая строка";
+
+        Integer[] arrayIntegers = new Integer[2];
+        arrayIntegers[0] = 1;
+        arrayIntegers[1] = 2;
+
+        Double[] arrayDoubles = new Double[2];
+        arrayDoubles[0] = 0.0;
+        arrayDoubles[1] = 1.1;
+
+        System.out.println("arrayStrings - " + mainObject.print(arrayStrings));
+        arrayStrings = (String[]) mainObject.changeAB(arrayStrings);
+        System.out.println("Reverse arrayStrings - " + mainObject.print(arrayStrings));
+
+        System.out.println("arrayIntegers - " + mainObject.print(arrayIntegers));
+        arrayIntegers = (Integer[]) mainObject.changeAB(arrayIntegers);
+        System.out.println("Reverse arrayIntegers - " + mainObject.print(arrayIntegers));
+
+        System.out.println("arrayDoubles - " + mainObject.print(arrayDoubles));
+        arrayDoubles = (Double[]) mainObject.changeAB(arrayDoubles);
+        System.out.println("Reverse arrayDoubles - " + mainObject.print(arrayDoubles));
+
+        System.out.println("--------------------------\n");
+    }
+}

java3/lesson1/src/main/java/javacore/lesson1/Task2.java

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+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1;
+
+import java.util.ArrayList;
+
+/**
+ *
+ * @author igor
+ */
+public class Task2 <T extends Object> {
+    public ArrayList<T> convertToArrayList(T[] array) {
+        ArrayList<T> arrayList = new ArrayList<>();
+        for(int i = 0; i < array.length; i++) {
+            arrayList.add(array[i]);
+        }
+        return arrayList;
+    }
+    public void test() {
+        System.out.println("Test started! Task2.\n");
+
+        Task2 mainObject = new Task2();
+
+        Integer[] arrayInteger = {1,2,3,4,5,6,7,8,9,0};
+        System.out.println(arrayInteger.getClass().getCanonicalName());
+        System.out.println(mainObject.convertToArrayList(arrayInteger));
+
+        String[] arrayString = {"a1","a2","a3","a4","a5","a6","a7","a8","a9","a0"};
+        System.out.println(arrayString.getClass().getCanonicalName());        
+        System.out.println(mainObject.convertToArrayList(arrayString));
+
+        System.out.println("--------------------------\n");
+    }
+}

java3/lesson1/src/main/java/javacore/lesson1/Task4.java

@@ -0,0 +1,14 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1;
+
+/**
+ *
+ * @author igor
+ */
+public class Task4 {
+
+}

java3/lesson1/src/main/java/javacore/lesson1/Tests.java

@@ -0,0 +1,23 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1;
+
+import javacore.lesson1.task3.Task3;
+
+/**
+ *
+ * @author igor
+ */
+public class Tests {
+    public static void main(String[] args) {
+        Task1 task1 = new Task1();
+        task1.test();
+        Task2 task2 = new Task2();
+        task2.test();
+        Task3 task3 = new Task3();
+        task3.test();
+    }
+}

java3/lesson1/src/main/java/javacore/lesson1/task3/Apple.java

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+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1.task3;
+
+/**
+ *
+ * @author igor
+ */
+public class Apple extends Fruit {
+    public Apple(float weight) {
+        super(weight);
+    }
+}

java3/lesson1/src/main/java/javacore/lesson1/task3/Box.java

@@ -0,0 +1,39 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1.task3;
+
+import java.util.ArrayList;
+
+/**
+ *
+ * @author igor
+ */
+public class Box<T extends Fruit> {
+    private ArrayList<T> fruits;
+    public Box() {
+        fruits = new ArrayList<>();
+    }
+    public void addFruit(T fruit) {
+        this.fruits.add(fruit);
+    }
+    public float getWeight() {
+        float resultWeight = 0f;
+        if(fruits.size() == 0) {
+            return resultWeight;
+        }
+        for(T fruit: fruits) {
+            resultWeight += fruit.getWeight();
+        }
+        return resultWeight;
+    }
+    public boolean compare(Box<T> anotherBox) {
+        return this.getWeight() == anotherBox.getWeight() ? true : false; 
+    }
+    @Override
+    public String toString() {
+        return this.fruits.toString();
+    }
+}

java3/lesson1/src/main/java/javacore/lesson1/task3/Fruit.java

@@ -0,0 +1,24 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1.task3;
+
+/**
+ *
+ * @author igor
+ */
+public class Fruit {
+    protected float weight;
+    public Fruit(float weight) {
+        this.weight = weight;
+    }
+    public float getWeight() {
+        return this.weight;
+    }
+    @Override
+    public String toString() {
+        return this.getClass().getCanonicalName();
+    }
+}

java3/lesson1/src/main/java/javacore/lesson1/task3/Orange.java

@@ -0,0 +1,16 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1.task3;
+
+/**
+ *
+ * @author igor
+ */
+public class Orange extends Fruit {
+    public Orange(float weight) {
+        super(weight);
+    }
+}

java3/lesson1/src/main/java/javacore/lesson1/task3/Task3.java

@@ -0,0 +1,42 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package javacore.lesson1.task3;
+
+/**
+ *
+ * @author igor
+ */
+public class Task3 {
+    public void test() {
+        System.out.println("Test started! Task3.\n");
+
+        Apple apple1 = new Apple(2.0f);
+        Apple apple2 = new Apple(2.0f);
+        Apple apple3 = new Apple(2.0f);
+
+        Orange orange1 = new Orange(1.0f);
+        Orange orange2 = new Orange(1.1f);
+        Orange orange3 = new Orange(1.5f);
+
+        Box boxApples = new Box();
+        boxApples.addFruit(apple1);
+        boxApples.addFruit(apple2);
+        boxApples.addFruit(apple3);
+        System.out.println("boxApples - " + boxApples);
+        System.out.println("boxApples weight - " + boxApples.getWeight());
+
+        Box boxOranges = new Box();
+        boxOranges.addFruit(orange1);
+        boxOranges.addFruit(orange2);
+        boxOranges.addFruit(orange3);
+        System.out.println("boxOranges - " + boxOranges);
+        System.out.println("boxOranges weight - " + boxOranges.getWeight());
+
+        System.out.println("Compare boxOranges and boxApples - " + boxOranges.compare(boxApples));
+
+        System.out.println("--------------------------\n");
+    }
+}