Java. Задачи по основам программирования

src/main/java/ru/job4j/io/Task14.java

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+package ru.job4j.io;
+
+public class Task14 {
+    public static void main(String[] args) {
+        // YOUR CODE
+        String greeting = "Hello, friend!";
+        String[] split = greeting.replaceAll("\\s+", "").split("");
+        String result = String.join("-", split).replace("-!", "!");
+        System.out.print(result);
+    }
+}

src/main/java/ru/job4j/io/Task15.java

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+package ru.job4j.io;
+
+public class Task15 {
+    public static void main(String[] args) {
+        String source = "+!?";
+        // YOUR CODE
+        String[] symbols = source.split("");
+        String string = symbols[0].repeat(3) + System.lineSeparator() +
+                symbols[1].repeat(4) + System.lineSeparator() +
+                symbols[2].repeat(2);
+        System.out.print(string);
+    }
+}

src/main/java/ru/job4j/io/Task16.java

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+package ru.job4j.io;
+
+public class Task16 {
+    public static void main(String[] args) {
+        String source = "+!?";
+        // YOUR CODE
+        String[] symbols = source.split("");
+        String string = symbols[0].repeat(3)
+                + symbols[1].repeat(4) + symbols[2].repeat(2);
+        System.out.print(string);
+    }
+}

src/main/java/ru/job4j/io/Task17.java

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+package ru.job4j.io;
+
+public class Task17 {
+    public static void main(String[] args) {
+        // YOUR CODE
+        int x = 6;
+        System.out.println(x);
+        System.out.println(x * x);
+        System.out.print(x * x * x);
+    }
+}

src/main/java/ru/job4j/io/Task18.java

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+package ru.job4j.io;
+
+public class Task18 {
+    public static void main(String[] args) {
+        // YOUR CODE
+        int x = 9;
+        System.out.println("Значение x равно " + x);
+        System.out.print("Значение x^2 равно " + (x * x));
+    }
+}

src/main/java/ru/job4j/io/Task19.java

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+package ru.job4j.io;
+
+public class Task19 {
+    public static void main(String[] args) {
+        // YOUR CODE
+        int x = 4;
+        int y = 11;
+        System.out.println("Значение x равно " + x + "; значение y равно " + y);
+        System.out.println("Произведение x и y равно " + (x * y));
+        System.out.print("Сумма x и y равно " + (x + y));
+    }
+}

src/main/java/ru/job4j/io/Task20.java

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+package ru.job4j.io;
+
+public class Task20 {
+    public static void main(String[] args) {
+        String fullName = "Фамилия Имя Отчество";
+        String phoneNumber = "+7(938) 123-45-67";
+        // YOUR CODE
+        int maxLenght = Math.max(fullName.length(), phoneNumber.length());
+        String topBorders = "*".repeat(maxLenght + 4);
+        String bottomBorders = topBorders;
+        String result = topBorders + System.lineSeparator();
+        result += "* " + fullName + " ".repeat(maxLenght - fullName.length() + 1)
+                + "*" + System.lineSeparator();
+        result += "* " + phoneNumber + " ".repeat(maxLenght - phoneNumber.length() + 1)
+                + "*" + System.lineSeparator();
+        result += bottomBorders;
+        System.out.print(result);
+    }
+}

src/main/java/ru/job4j/io/Task21.java

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+package ru.job4j.io;
+
+import java.util.Scanner;
+
+public class Task21 {
+    public static void main(String[] args) {
+        Scanner in = new Scanner(System.in);
+        int columnCount = in.nextInt();
+        String star = "*";
+        String space = " ";
+        // YOUR CODE
+        int level = 2;
+        String topSide = star.repeat(columnCount);
+        int currentColumn = 1;
+        // Количество символов на каждом уровне кроме первого и последнего, чтобы не печатать ненужные крайние пробелы.
+        int levelColumnCount;
+        StringBuilder result = new StringBuilder(topSide).append(System.lineSeparator());
+        while (level < columnCount) {
+            levelColumnCount = level <= columnCount / 2 ? columnCount - level + 1 : level;
+            while (currentColumn <= levelColumnCount) {
+                if (currentColumn == level || currentColumn == columnCount - level + 1) {
+                    result.append(star);
+                } else {
+                    result.append(space);
+                }
+                currentColumn++;
+            }
+            result.append(System.lineSeparator());
+            level++;
+            currentColumn = 1;
+        }
+        result.append(topSide);
+        System.out.print(result);
+    }
+}

src/test/java/ru/job4j/io/Task14Test.java

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+package ru.job4j.io;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class Task14Test {
+
+    @Test
+    public void whenDelimiterIsPastedBetweenLettersOfString() {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        Task14.main(null);
+        assertThat(out.toString(), is("H-e-l-l-o-,-f-r-i-e-n-d!"));
+    }
+}

src/test/java/ru/job4j/io/Task15Test.java

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+package ru.job4j.io;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class Task15Test {
+    @Test
+    public void eachSequenceOfSameSymbolsOnSeparateLine() {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        Task15.main(null);
+        String expected = String.format("+++%S!!!!%S??", System.lineSeparator(), System.lineSeparator());
+        assertThat(out.toString(), is(expected));
+    }
+}

src/test/java/ru/job4j/io/Task16Test.java

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+package ru.job4j.io;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class Task16Test {
+    @Test
+    public void eachSequenceOfSameSymbolsOnOneLine() {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        Task16.main(null);
+        assertThat(out.toString(), is("+++!!!!??"));
+    }
+}

src/test/java/ru/job4j/io/Task17Test.java

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+package ru.job4j.io;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class Task17Test {
+    @Test
+    public void shouldOutputSqrAndCubeOf6() {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        Task17.main(null);
+        String expected = "6" + System.lineSeparator() + "36" + System.lineSeparator()
+                + "216";
+        assertThat(out.toString(), is(expected));
+    }
+}

src/test/java/ru/job4j/io/Task18Test.java

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+package ru.job4j.io;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class Task18Test {
+    @Test
+    public void shouldOutputStringPlusNumber() {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        Task18.main(null);
+        String expected = "Значение x равно 9" + System.lineSeparator() + "Значение x^2 равно 81";
+        assertThat(out.toString(), is(expected));
+    }
+}

src/test/java/ru/job4j/io/Task19Test.java

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+package ru.job4j.io;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class Task19Test {
+    @Test
+    public void shouldOutputStringWithTwoVariables() {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        Task19.main(null);
+        String expected = "Значение x равно 4; значение y равно 11" + System.lineSeparator()
+                + "Произведение x и y равно 44" + System.lineSeparator()
+                + "Сумма x и y равно 15";
+        assertThat(out.toString(), is(expected));
+    }
+}

src/test/java/ru/job4j/io/Task20Test.java

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+package ru.job4j.io;
+
+import org.junit.Test;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class Task20Test {
+    @Test
+    public void shouldOutputFullNameAndPhoneInFrame() {
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        Task20.main(null);
+        String expected = "************************" + System.lineSeparator()
+                + "* Фамилия Имя Отчество *" + System.lineSeparator()
+                + "* +7(938) 123-45-67    *" + System.lineSeparator()
+                + "************************";
+        assertThat(out.toString(), is(expected));
+    }
+}

src/test/java/ru/job4j/io/Task21Test.java

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+package ru.job4j.io;
+
+import org.junit.Test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+
+public class Task21Test {
+    @Test
+    public void whenHourglassWidthEquals3() {
+        ByteArrayInputStream in = new ByteArrayInputStream("5".getBytes());
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        System.setIn(in);
+        Task21.main(null);
+        String expected =
+                "*****" + System.lineSeparator() +
+                " * *" + System.lineSeparator() +
+                "  *" + System.lineSeparator() +
+                " * *" + System.lineSeparator() +
+                "*****";
+        assertThat(out.toString(), is(expected));
+    }
+
+    @Test
+    public void whenHourglassWidthEquals8() {
+        ByteArrayInputStream in = new ByteArrayInputStream("8".getBytes());
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        System.setIn(in);
+        Task21.main(null);
+        String expected =
+                "********" + System.lineSeparator() +
+                " *    *" + System.lineSeparator() +
+                "  *  *" + System.lineSeparator() +
+                "   **" + System.lineSeparator() +
+                "   **" + System.lineSeparator() +
+                "  *  *" + System.lineSeparator() +
+                " *    *" + System.lineSeparator() +
+                "********";
+        assertThat(out.toString(), is(expected));
+    }
+
+    @Test
+    public void whenHourglassWidthEquals9() {
+        ByteArrayInputStream in = new ByteArrayInputStream("9".getBytes());
+        ByteArrayOutputStream out = new ByteArrayOutputStream();
+        System.setOut(new PrintStream(out));
+        System.setIn(in);
+        Task21.main(null);
+        String expected =
+                "*********" + System.lineSeparator() +
+                " *     *" + System.lineSeparator() +
+                "  *   *" + System.lineSeparator() +
+                "   * *" + System.lineSeparator() +
+                "    *" + System.lineSeparator() +
+                "   * *" + System.lineSeparator() +
+                "  *   *" + System.lineSeparator() +
+                " *     *" + System.lineSeparator() +
+                "*********";
+        assertThat(out.toString(), is(expected));
+    }
+}