BAEL-2565 (#6077)

* BAEL-2565

* BAEL-2565
Test code consistency

core-java-8/src/main/java/com/baeldung/enums/values/Element1.java

@@ -0,0 +1,17 @@
+package com.baeldung.enums.values;
+
+/**
+ * This is a simple enum of periodic table elements
+ */
+public enum Element1 {
+    H,
+    HE,
+    LI,
+    BE,
+    B,
+    C,
+    N,
+    O,
+    F,
+    NE
+}

core-java-8/src/main/java/com/baeldung/enums/values/Element2.java

@@ -0,0 +1,52 @@
+package com.baeldung.enums.values;
+
+/**
+ * The simple enum has been enhanced to add the name of the element.
+ */
+public enum Element2 {
+    H("Hydrogen"),
+    HE("Helium"),
+    LI("Lithium"),
+    BE("Beryllium"),
+    B("Boron"),
+    C("Carbon"),
+    N("Nitrogen"),
+    O("Oxygen"),
+    F("Flourine"),
+    NE("Neon");
+
+    /** a final variable to store the label, which can't be changed */
+    public final String label;
+
+    /**
+     * A private constructor that sets the label.
+     * @param label 
+     */
+    private Element2(String label) {
+        this.label = label;
+    }
+
+    /**
+     * Look up Element2 instances by the label field. This implementation iterates through 
+     * the values() list to find the label.
+     * @param label The label to look up
+     * @return The Element2 instance with the label, or null if not found.
+     */
+    public static Element2 valueOfLabel(String label) {
+        for (Element2 e2 : values()) {
+            if (e2.label.equals(label)) {
+                return e2;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Override the toString() method to return the label instead of the declared name.
+     * @return 
+     */
+    @Override
+    public String toString() {
+        return this.label;
+    }
+}

core-java-8/src/main/java/com/baeldung/enums/values/Element3.java

@@ -0,0 +1,63 @@
+package com.baeldung.enums.values;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * A Map has been added to cache labels for faster lookup.
+ */
+public enum Element3 {
+    H("Hydrogen"),
+    HE("Helium"),
+    LI("Lithium"),
+    BE("Beryllium"),
+    B("Boron"),
+    C("Carbon"),
+    N("Nitrogen"),
+    O("Oxygen"),
+    F("Flourine"),
+    NE("Neon");
+
+    /** 
+     * A map to cache labels and their associated Element3 instances.
+     * Note that this only works if the labels are all unique!
+     */
+    private static final Map<String, Element3> BY_LABEL = new HashMap<>();
+    
+    /** populate the BY_LABEL cache */
+    static {
+        for (Element3 e3 : values()) {
+            BY_LABEL.put(e3.label, e3);
+        }
+    }
+
+    /** a final variable to store the label, which can't be changed */
+    public final String label;
+
+    /**
+     * A private constructor that sets the label.
+     * @param label 
+     */
+    private Element3(String label) {
+        this.label = label;
+    }
+
+    /**
+     * Look up Element2 instances by the label field. This implementation finds the
+     * label in the BY_LABEL cache.
+     * @param label The label to look up
+     * @return The Element3 instance with the label, or null if not found.
+     */
+    public static Element3 valueOfLabel(String label) {
+        return BY_LABEL.get(label);
+    }
+
+    /**
+     * Override the toString() method to return the label instead of the declared name.
+     * @return 
+     */
+    @Override
+    public String toString() {
+        return this.label;
+    }
+}

core-java-8/src/main/java/com/baeldung/enums/values/Element4.java

@@ -0,0 +1,95 @@
+package com.baeldung.enums.values;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Multiple fields have been added and the Labeled interface is implemented.
+ */
+public enum Element4 implements Labeled {
+    H("Hydrogen", 1, 1.008f),
+    HE("Helium", 2, 4.0026f),
+    LI("Lithium", 3, 6.94f),
+    BE("Beryllium", 4, 9.01722f),
+    B("Boron", 5, 10.81f),
+    C("Carbon", 6, 12.011f),
+    N("Nitrogen", 7, 14.007f),
+    O("Oxygen", 8, 15.999f),
+    F("Flourine", 9, 18.998f),
+    NE("Neon", 10, 20.180f);
+    /** 
+     * Maps cache labels and their associated Element3 instances.
+     * Note that this only works if the values are all unique!
+     */
+    private static final Map<String, Element4> BY_LABEL = new HashMap<>();
+    private static final Map<Integer, Element4> BY_ATOMIC_NUMBER = new HashMap<>();
+    private static final Map<Float, Element4> BY_ATOMIC_WEIGHT = new HashMap<>();
+    
+    /** populate the caches */
+    static {
+        for (Element4 e4 : values()) {
+            BY_LABEL.put(e4.label, e4);
+            BY_ATOMIC_NUMBER.put(e4.atomicNumber, e4);
+            BY_ATOMIC_WEIGHT.put(e4.atomicWeight, e4);
+        }
+    }
+
+    /** final variables to store the values, which can't be changed */
+    public final String label;
+    public final int atomicNumber;
+    public final float atomicWeight;
+
+    private Element4(String label, int atomicNumber, float atomicWeight) {
+        this.label = label;
+        this.atomicNumber = atomicNumber;
+        this.atomicWeight = atomicWeight;
+    }
+
+    /**
+     * Implement the Labeled interface.
+     * @return the label value
+     */
+    @Override
+    public String label() {
+        return label;
+    }
+
+    /**
+     * Look up Element2 instances by the label field. This implementation finds the
+     * label in the BY_LABEL cache.
+     * @param label The label to look up
+     * @return The Element4 instance with the label, or null if not found.
+     */
+    public static Element4 valueOfLabel(String label) {
+        return BY_LABEL.get(label);
+    }
+
+    /**
+     * Look up Element2 instances by the atomicNumber field. This implementation finds the
+     * atomicNUmber in the cache.
+     * @param number The atomicNumber to look up 
+     * @return The Element4 instance with the label, or null if not found.
+     */
+    public static Element4 valueOfAtomicNumber(int number) {
+        return BY_ATOMIC_NUMBER.get(number);
+    }
+
+    /**
+     * Look up Element2 instances by the atomicWeight field. This implementation finds the
+     * atomic weight in the cache.
+     * @param weight the atomic weight to look up
+     * @return The Element4 instance with the label, or null if not found.
+     */
+    public static Element4 valueOfAtomicWeight(float weight) {
+        return BY_ATOMIC_WEIGHT.get(weight);
+    }
+
+    /**
+     * Override the toString() method to return the label instead of the declared name.
+     * @return 
+     */
+    @Override
+    public String toString() {
+        return this.label;
+    }
+}

core-java-8/src/main/java/com/baeldung/enums/values/Labeled.java

@@ -0,0 +1,5 @@
+package com.baeldung.enums.values;
+
+public interface Labeled {
+    String label();
+}

core-java-8/src/test/java/com/baeldung/enums/values/Element1UnitTest.java

@@ -0,0 +1,48 @@
+package com.baeldung.enums.values;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+/**
+ *
+ * @author chris
+ */
+public class Element1UnitTest {
+    
+    public Element1UnitTest() {
+    }
+    
+    @BeforeClass
+    public static void setUpClass() {
+    }
+    
+    @AfterClass
+    public static void tearDownClass() {
+    }
+    
+    @Before
+    public void setUp() {
+    }
+    
+    @After
+    public void tearDown() {
+    }
+
+    @Test
+    public void whenAccessingToString_thenItShouldEqualName() {
+        for (Element1 e1 : Element1.values()) {
+            assertEquals(e1.name(), e1.toString());
+        }
+    }
+    
+    @Test
+    public void whenCallingValueOf_thenReturnTheCorrectEnum() {
+        for (Element1 e1 : Element1.values()) {
+            assertSame(e1, Element1.valueOf(e1.name()));
+        }
+    }
+}

core-java-8/src/test/java/com/baeldung/enums/values/Element2UnitTest.java

@@ -0,0 +1,59 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.baeldung.enums.values;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.junit.Assert.*;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ *
+ * @author chris
+ */
+public class Element2UnitTest {
+    private static final Logger LOGGER = LoggerFactory.getLogger(Element2UnitTest.class);
+    
+    public Element2UnitTest() {
+    }
+    
+    @BeforeClass
+    public static void setUpClass() {
+    }
+    
+    @AfterClass
+    public static void tearDownClass() {
+    }
+    
+    @Before
+    public void setUp() {
+    }
+    
+    @After
+    public void tearDown() {
+    }
+
+    @Test
+    public void whenLocatebyLabel_thenReturnCorrectValue() {
+        for (Element2 e2 : Element2.values()) {
+            assertSame(e2, Element2.valueOfLabel(e2.label));
+        }
+    }
+
+    /**
+     * Test of toString method, of class Element2.
+     */
+    @Test
+    public void whenCallingToString_thenReturnLabel() {
+        for (Element2 e2 : Element2.values()) {
+            assertEquals(e2.label, e2.toString());
+        }
+    }
+}

core-java-8/src/test/java/com/baeldung/enums/values/Element3UnitTest.java

@@ -0,0 +1,57 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.baeldung.enums.values;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+/**
+ *
+ * @author chris
+ */
+public class Element3UnitTest {
+    
+    public Element3UnitTest() {
+    }
+    
+    @BeforeClass
+    public static void setUpClass() {
+    }
+    
+    @AfterClass
+    public static void tearDownClass() {
+    }
+    
+    @Before
+    public void setUp() {
+    }
+    
+    @After
+    public void tearDown() {
+    }
+
+    @Test
+    public void whenLocatebyLabel_thenReturnCorrectValue() {
+        for (Element3 e3 : Element3.values()) {
+            assertSame(e3, Element3.valueOfLabel(e3.label));
+        }
+    }
+
+    /**
+     * Test of toString method, of class Element3.
+     */
+    @Test
+    public void whenCallingToString_thenReturnLabel() {
+        for (Element3 e3 : Element3.values()) {
+            assertEquals(e3.label, e3.toString());
+        }
+    }
+    
+}

core-java-8/src/test/java/com/baeldung/enums/values/Element4UnitTest.java

@@ -0,0 +1,71 @@
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.baeldung.enums.values;
+
+import org.junit.After;
+import org.junit.AfterClass;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+/**
+ *
+ * @author chris
+ */
+public class Element4UnitTest {
+    
+    public Element4UnitTest() {
+    }
+    
+    @BeforeClass
+    public static void setUpClass() {
+    }
+    
+    @AfterClass
+    public static void tearDownClass() {
+    }
+    
+    @Before
+    public void setUp() {
+    }
+    
+    @After
+    public void tearDown() {
+    }
+
+    @Test
+    public void whenLocatebyLabel_thenReturnCorrectValue() {
+        for (Element4 e4 : Element4.values()) {
+            assertSame(e4, Element4.valueOfLabel(e4.label));
+        }
+    }
+
+    @Test
+    public void whenLocatebyAtmNum_thenReturnCorrectValue() {
+        for (Element4 e4 : Element4.values()) {
+            assertSame(e4, Element4.valueOfAtomicNumber(e4.atomicNumber));
+        }
+    }
+
+    @Test
+    public void whenLocatebyAtmWt_thenReturnCorrectValue() {
+        for (Element4 e4 : Element4.values()) {
+            assertSame(e4, Element4.valueOfAtomicWeight(e4.atomicWeight));
+        }
+    }
+
+    /**
+     * Test of toString method, of class Element4.
+     */
+    @Test
+    public void whenCallingToString_thenReturnLabel() {
+        for (Element4 e4 : Element4.values()) {
+            assertEquals(e4.label, e4.toString());
+        }
+    }
+    
+}