BAEL-5391 - Java Error "Missing return statement" (#5) (#11845)

* BAEL-5391 - Java Error "Missing return statement" (#5)

* BAEL-5391 - Java Error "Missing return statement"

core-java-modules/core-java-exceptions-4/src/main/java/com/baeldung/exception/missingreturnstatement/MissingReturnStatement.java

@@ -0,0 +1,41 @@
+package com.baeldung.exception.missingreturnstatement;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+public class MissingReturnStatement {
+    public static void main(String[] args) {
+        int a = -12;
+        int result = pow(a);
+        System.out.println(result);
+        Map<String, Integer> dictionary = createDictionary();
+        dictionary.forEach((s, integer) -> System.out.println(s + " " + integer));
+    }
+
+    public static int pow(int number) {
+        int pow = number * number;
+        return pow;
+    }
+
+    public static String checkNumber(int number) {
+        if (number == 0) {
+            return "It's equals to zero";
+        }
+
+        for (int i = 0; i < number; i++) {
+            if (i > 100) {
+                return "It's a big number";
+            }
+        }
+        return "It's a negative number";
+    }
+
+    public static Map<String, Integer> createDictionary() {
+        List<String> words = Arrays.asList("Hello", "World");
+        return words.stream()
+            .collect(Collectors.toMap(s -> s, s -> 1));
+    }
+
+}

core-java-modules/core-java-exceptions-4/src/test/java/com/baeldung/exception/missingreturnstatement/MissingReturnStatementUnitTest.java

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+package com.baeldung.exception.missingreturnstatement;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Map;
+
+import org.junit.Test;
+
+public class MissingReturnStatementUnitTest {
+
+    @Test
+    public void givenANumber_thenReturnItsPow() {
+        int number = 10;
+        int pow = MissingReturnStatement.pow(number);
+        assertEquals(100, pow);
+    }
+
+    @Test
+    public void givenABigNumber_thenReturnItsType() {
+        int number = 200;
+        String type = MissingReturnStatement.checkNumber(number);
+        assertEquals("It's a big number", type);
+    }
+
+    @Test
+    public void givenANegativeNumber_thenReturnItsType() {
+        int number = -10;
+        String type = MissingReturnStatement.checkNumber(number);
+        assertEquals("It's a negative number", type);
+    }
+
+    @Test
+    public void getStringDictionary_thenPrintValues() {
+        Map<String, Integer> dictionary = MissingReturnStatement.createDictionary();
+        assertEquals(2, dictionary.size());
+        dictionary.forEach((s, integer) -> System.out.println(s + " - " + integer));
+    }
+}