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cohort 42.1 hw #21, lesson #22
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Lines changed: 294 additions & 3 deletions

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‎BerlinAIT/Cohort42.1/src/lesson19/homework/RubberArray.java‎

Lines changed: 10 additions & 3 deletions
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package lesson19.homework;
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import java.util.Arrays;
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public class RubberArray {
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private final int INIT_DATA_SIZE = 10;
@@ -14,6 +12,10 @@ public RubberArray() {
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length = 0;
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}
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public int size() {
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return length;
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}
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public int get(int idx) {
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return data[idx];
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}
@@ -39,6 +41,9 @@ public void add(int value) {
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}
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public void add(int value, int idx) {
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if (idx > length) {
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throw new IndexOutOfBoundsException();
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}
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extendArrayIfNeed();
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// insert value
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// 0;1;2;3;4;5
@@ -47,12 +52,14 @@ public void add(int value, int idx) {
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for (int i = length; i > idx; i--) {
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data[i] = data[i - 1];
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}
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System.out.println(Arrays.toString(data));
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data[idx] = value;
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length++;
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}
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public void remove(int idx) {
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if (idx > length) {
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throw new IndexOutOfBoundsException();
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}
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// move elements right to left from idx
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for (int i = idx; i < data.length - 1; i++) {
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data[i] = data[i + 1];

‎BerlinAIT/Cohort42.1/src/lesson22/Horse.java‎

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package lesson22;
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public class Horse {
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private String name;
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public Horse(String name) {
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this.name = name;
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}
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public void run() {
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System.out.println("run...");
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}
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public void walk() {
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System.out.println("walk...");
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}
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public void hidden() {
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System.out.println("Horse hidden...");
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}
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@Override
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public String toString() {
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return "{" +
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"name='" + name + '\'' +
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'}';
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}
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}

‎BerlinAIT/Cohort42.1/src/lesson22/Lesson22.java‎

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package lesson22;
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/**
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* AIT-TR, cohort 42.1, Java Basic, Lesson #22
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*
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* @version 4-Mar-24
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*/
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public class Lesson22 {
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public static void main(String[] args) {
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Horse horse = new Horse("Tunder");
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System.out.println(horse);
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horse.run();
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horse.walk();
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Pegas pegas = new Pegas("Pegas");
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System.out.println(pegas);
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pegas.run();
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pegas.walk();
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pegas.fly();
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}
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}

‎BerlinAIT/Cohort42.1/src/lesson22/Pegas.java‎

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package lesson22;
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public class Pegas extends Horse {
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private int wingsCount;
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public Pegas(String name) {
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super(name);
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}
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public void hidden() {
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super.hidden();
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}
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public void fly() {
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System.out.println("fly...");
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}
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}

‎BerlinAIT/Cohort42.1/src/lesson22/Rectangle.java‎

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package lesson22;
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public class Rectangle extends Shape2D {
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}

‎BerlinAIT/Cohort42.1/src/lesson22/Shape2D.java‎

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package lesson22;
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public class Shape2D {
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protected int a, b;
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public double perimeter() {
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return (a + b) * 2;
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}
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public double area() {
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return a * b;
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}
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}

‎BerlinAIT/Cohort42.1/src/lesson22/Square.java‎

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package lesson22;
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public class Square extends Shape2D {
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@Override
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public double perimeter() {
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return a * 4;
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}
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@Override
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public double area() {
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return a * a;
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}
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}

‎BerlinAIT/Cohort42.1/src/lesson22/TriangleRectangle.java‎

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package lesson22;
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public class TriangleRectangle extends Shape2D {
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@Override
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public double perimeter() {
7+
return a + b + Math.sqrt(a*a + b*b);
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}
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@Override
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public double area() {
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return a * b / 2.;
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}
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}

‎BerlinAIT/Cohort42.1mvn/src/main/java/lesson21/homework/RubberArray.java‎

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package lesson21.homework;
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import java.util.Arrays;
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public class RubberArray {
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private final int INIT_DATA_SIZE = 10;
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private final float EXTEND_INDEX = 1.5f;
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private int[] data;
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private int length;
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public RubberArray() {
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data = new int[INIT_DATA_SIZE];
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length = 0;
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}
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public int size() {
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return length;
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}
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public int get(int idx) {
22+
return data[idx];
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}
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private void extendArrayIfNeed() {
26+
if (length == data.length) {
27+
// create new array, length * EXTEND_INDEX
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int[] newData = new int[(int) (data.length * EXTEND_INDEX)];
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// move all items to new array
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for (int i = 0; i < data.length; i++) {
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newData[i] = data[i];
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}
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// change link to new array
34+
data = newData;
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}
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}
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38+
public void add(int value) {
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extendArrayIfNeed();
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// add value
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data[length] = value;
42+
length++;
43+
}
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public void add(int value, int idx) {
46+
if (idx > length) {
47+
throw new IndexOutOfBoundsException();
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}
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extendArrayIfNeed();
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// insert value
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// 0;1;2;3;4;5
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// 8,4,3,2,1,1 -> i == 5
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// 8,4,3,2,2,1 -> i == 4
54+
for (int i = length; i > idx; i--) {
55+
data[i] = data[i - 1];
56+
}
57+
data[idx] = value;
58+
length++;
59+
}
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61+
public void remove(int idx) {
62+
if (idx > length) {
63+
throw new IndexOutOfBoundsException();
64+
}
65+
// move elements right to left from idx
66+
for (int i = idx; i < data.length - 1; i++) {
67+
data[i] = data[i + 1];
68+
}
69+
length--;
70+
}
71+
72+
public boolean contains(int value) {
73+
return indexOf(value) != -1;
74+
}
75+
76+
public int indexOf(int value) {
77+
for (int i = 0; i < length; i++) {
78+
if (data[i] == value) {
79+
return i;
80+
}
81+
}
82+
return -1;
83+
}
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85+
@Override
86+
public String toString() {
87+
StringBuilder sb = new StringBuilder("[");
88+
for (int i = 0; i < length; i++) {
89+
sb.append(data[i]);
90+
if (i < length - 1) {
91+
sb.append(", ");
92+
}
93+
}
94+
return sb.append("]").toString();
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}
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}

‎BerlinAIT/Cohort42.1mvn/src/test/java/lesson21/homework/RubberArrayTest.java‎

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package lesson21.homework;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.BeforeEach;
5+
import org.junit.jupiter.api.Test;
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/**
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* AIT-TR, cohort 42.1, Java Basic, hw #21
9+
*
10+
* @author Sergey Iryupin
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* @version 4-mar-24
12+
*/
13+
public class RubberArrayTest {
14+
15+
private RubberArray rubberArray;
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@BeforeEach
18+
public void init() {
19+
rubberArray = new RubberArray();
20+
}
21+
22+
@Test
23+
public void testGet() {
24+
rubberArray.add(12);
25+
Assertions.assertEquals(12, rubberArray.get(0));
26+
}
27+
28+
@Test
29+
public void testAdd() {
30+
Assertions.assertEquals(0,rubberArray.size());
31+
rubberArray.add(25);
32+
Assertions.assertEquals(1, rubberArray.size());
33+
Assertions.assertEquals(25, rubberArray.get(0));
34+
}
35+
36+
@Test
37+
public void testAddByIndex() {
38+
rubberArray.add(25);
39+
rubberArray.add(25);
40+
rubberArray.add(7, 1);
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Assertions.assertEquals(3, rubberArray.size());
42+
Assertions.assertEquals(7, rubberArray.get(1));
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}
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@Test
46+
public void testRemove() {
47+
rubberArray.add(-1);
48+
rubberArray.add(3);
49+
Assertions.assertEquals(2, rubberArray.size());
50+
rubberArray.remove(1);
51+
Assertions.assertEquals(1, rubberArray.size());
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}
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@Test
55+
public void testContains() {
56+
rubberArray.add(-1);
57+
rubberArray.add(3);
58+
Assertions.assertTrue(rubberArray.contains(-1));
59+
Assertions.assertFalse(rubberArray.contains(5));
60+
}
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@Test
63+
public void testIndexOf() {
64+
rubberArray.add(-1);
65+
rubberArray.add(3);
66+
Assertions.assertEquals(1, rubberArray.indexOf(3));
67+
Assertions.assertEquals(-1, rubberArray.indexOf(5));
68+
}
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70+
@Test
71+
public void testToString() {
72+
rubberArray.add(-1);
73+
rubberArray.add(3);
74+
Assertions.assertEquals("[-1, 3]", rubberArray.toString());
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}
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}

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