BAEL-2182 (#5257)

* BAEL-2182

* refactoring

core-java/src/main/java/com/baeldung/switchstatement/SwitchStatement.java

@@ -0,0 +1,70 @@
+package com.baeldung.switchstatement;
+
+public class SwitchStatement {
+
+    public String exampleOfIF(String animal) {
+
+        String result;
+
+        if (animal.equals("DOG") || animal.equals("CAT")) {
+            result = "domestic animal";
+        } else if (animal.equals("TIGER")) {
+            result = "wild animal";
+        } else {
+            result = "unknown animal";
+        }
+        return result;
+    }
+
+    public String exampleOfSwitch(String animal) {
+
+        String result;
+
+        switch (animal) {
+        case "DOG":
+        case "CAT":
+            result = "domestic animal";
+            break;
+        case "TIGER":
+            result = "wild animal";
+            break;
+        default:
+            result = "unknown animal";
+            break;
+        }
+        return result;
+    }
+
+    public String forgetBreakInSwitch(String animal) {
+
+        String result;
+
+        switch (animal) {
+
+        case "DOG":
+            System.out.println("domestic animal");
+            result = "domestic animal";
+
+        default:
+            System.out.println("unknown animal");
+            result = "unknown animal";
+
+        }
+        return result;
+    }
+
+    public String constantCaseValue(String animal) {
+
+        String result = "";
+
+        final String dog = "DOG";
+
+        switch (animal) {
+
+        case dog:
+            result = "domestic animal";
+        }
+        return result;
+    }
+
+}

core-java/src/test/java/com/baeldung/switchstatement/SwitchStatementUnitTest.java

@@ -0,0 +1,38 @@
+package com.baeldung.switchstatement;
+
+import org.junit.Test;
+
+import org.junit.Assert;
+
+public class SwitchStatementUnitTest {
+    private SwitchStatement s = new SwitchStatement();
+
+    
+    @Test
+    public void whenDog_thenDomesticAnimal() {
+        
+        String animal = "DOG";
+        Assert.assertEquals("domestic animal", s.exampleOfSwitch(animal));
+    }
+    
+    @Test
+    public void whenNoBreaks_thenGoThroughBlocks() {
+        String animal = "DOG";
+        Assert.assertEquals("unknown animal", s.forgetBreakInSwitch(animal));
+    }
+    
+    @Test(expected=NullPointerException.class)
+    public void whenSwitchAgumentIsNull_thenNullPointerException() {
+        String animal = null;
+        Assert.assertEquals("domestic animal", s.exampleOfSwitch(animal));
+    }
+    
+       
+    @Test
+    public void whenCompareStrings_thenByEqual() {
+        String animal = new String("DOG");
+        Assert.assertEquals("domestic animal", s.exampleOfSwitch(animal));
+    }
+    
+  
+}