4. Переопределение метода;

https://job4j.ru/profile/exercise/21/task/150/34750

src/main/java/ru/j4j/inheritance/HtmlReport.java

@@ -0,0 +1,9 @@
+package ru.j4j.inheritance;
+
+public class HtmlReport extends TextReport {
+    public String generate(String name, String body) {
+        return "<h1>" + name + "</h1>"
+                + "<br/>"
+                + "<span>" + body + "</span>";
+    }
+}

src/main/java/ru/j4j/inheritance/JSONReport.java

@@ -0,0 +1,11 @@
+package ru.j4j.inheritance;
+
+public class JSONReport {
+    public String generate(String name, String body) {
+        String ln = System.lineSeparator();
+        return String.format("{" + ln
+                + "\t\"name\" : \"%s\"," + ln
+                + "\t\"body\" : \"%s\"" + ln
+                + "}", name, body);
+    }
+}

src/main/java/ru/j4j/inheritance/ReportUsage.java

@@ -0,0 +1,11 @@
+package ru.j4j.inheritance;
+
+public class ReportUsage {
+    public static void main(String[] args) {
+        TextReport textReport = new TextReport();
+        HtmlReport htmlReport = new HtmlReport();
+        System.out.println(textReport.generate("Report's name", "Report's body"));
+        System.out.println(htmlReport.generate("Report's name", "Report's body"));
+
+    }
+}

src/main/java/ru/j4j/inheritance/TextReport.java

@@ -0,0 +1,7 @@
+package ru.j4j.inheritance;
+
+public class TextReport {
+    public String generate(String name, String body) {
+        return name + System.lineSeparator() + body;
+    }
+}

src/test/java/ru/j4j/inheritance/JSONReportTest.java

@@ -0,0 +1,34 @@
+package ru.j4j.inheritance;
+
+import org.junit.jupiter.api.Test;
+import static org.assertj.core.api.Assertions.assertThat;
+
+class JSONReportTest {
+    @Test
+    public void whenTestGenerateMethod() {
+        String ln = System.lineSeparator();
+        String expected = "{" + ln
+                + "\t\"name\" : \"Report's name\"," + ln
+                + "\t\"body\" : \"Report's body\"" + ln
+                + "}";
+        String name = "Report's name";
+        String body = "Report's body";
+        String result = new JSONReport().generate(name, body);
+        assertThat(result).isEqualTo(expected);
+    }
+
+    @Test
+    public void whenNameIsDavidBodyIsNameSong() {
+        String ln = System.lineSeparator();
+        String expected = "{" + ln
+                + "\t\"name\" : \"David Gilmour\"," + ln
+                + "\t\"body\" : \"Shine On You Crazy Diamond\"" + ln
+                + "}";
+        String name = "David Gilmour";
+        String body = "Shine On You Crazy Diamond";
+        String result = new JSONReport().generate(name, body);
+        assertThat(result).isEqualTo(expected);
+    }
+
+
+}