Added test cases for accessing all data types.

core-java-modules/core-java-reflection/src/main/java/com/baeldung/reflection/access/privatefields/Person.java

@@ -4,7 +4,21 @@ public class Person {
 
     private String name = "John";
 
-    private int age = 30;
+    private byte age = 30;
+
+    private short uidNumber = 5555;
+
+    private int pinCode = 452002;
+
+    private long contactNumber = 123456789L;
+
+    private float height = 6.1242f;
+
+    private double weight = 75.2564;
+
+    private char gender = 'M';
+
+    private boolean active = true;
 
     public String getName() {
         return name;
@@ -14,20 +28,68 @@ public class Person {
         this.name = name;
     }
 
-    public int getAge() {
+    public byte getAge() {
         return age;
     }
 
-    public void setAge(int age) {
+    public void setAge(byte age) {
         this.age = age;
     }
 
-    private String greet(String name) {
-        return "Hello " + name;
+    public short getUidNumber() {
+        return uidNumber;
     }
 
-    private int divideByZeroExample() {
-        return 1 / 0;
+    public void setUidNumber(short uidNumber) {
+        this.uidNumber = uidNumber;
+    }
+
+    public int getPinCode() {
+        return pinCode;
+    }
+
+    public void setPinCode(int pinCode) {
+        this.pinCode = pinCode;
+    }
+
+    public long getContactNumber() {
+        return contactNumber;
+    }
+
+    public void setContactNumber(long contactNumber) {
+        this.contactNumber = contactNumber;
+    }
+
+    public float getHeight() {
+        return height;
+    }
+
+    public void setHeight(float height) {
+        this.height = height;
+    }
+
+    public double getWeight() {
+        return weight;
+    }
+
+    public void setWeight(double weight) {
+        this.weight = weight;
+    }
+
+    public char getGender() {
+        return gender;
+    }
+
+    public void setGender(char gender) {
+        this.gender = gender;
+    }
+
+    public boolean isActive() {
+        return active;
+    }
+
+    public void setActive(boolean active) {
+        this.active = active;
     }
 
 }

core-java-modules/core-java-reflection/src/test/java/com/baeldung/reflection/access/privatefields/AccessPrivateFieldsUnitTest.java

@@ -11,39 +11,112 @@ public class AccessPrivateFieldsUnitTest {
     public void whenGetFields_thenSuccess() throws IllegalAccessException, IllegalArgumentException, NoSuchFieldException, NullPointerException {
         Person person = new Person();
 
-        Field fieldName = person.getClass()
+        Field nameField = person.getClass()
             .getDeclaredField("name");
-        fieldName.setAccessible(true);
+        nameField.setAccessible(true);
 
-        String name = (String) fieldName.get(person);
+        String name = (String) nameField.get(person);
 
-        Field fieldAge = person.getClass()
+        Field ageField = person.getClass()
             .getDeclaredField("age");
-        fieldAge.setAccessible(true);
+        ageField.setAccessible(true);
 
-        int age = fieldAge.getInt(person);
+        byte age = ageField.getByte(person);
 
         Assertions.assertEquals("John", name);
         Assertions.assertEquals(30, age);
     }
 
+    @Test
+    public void whenGetIntegerFields_thenSuccess() throws IllegalAccessException, IllegalArgumentException, NoSuchFieldException, NullPointerException {
+        Person person = new Person();
+
+        Field uidNumberField = person.getClass()
+            .getDeclaredField("uidNumber");
+        uidNumberField.setAccessible(true);
+
+        short uidNumber = uidNumberField.getShort(person);
+
+        Field pinCodeField = person.getClass()
+            .getDeclaredField("pinCode");
+        pinCodeField.setAccessible(true);
+
+        int pinCode = pinCodeField.getInt(person);
+
+        Field contactNumberField = person.getClass()
+            .getDeclaredField("contactNumber");
+        contactNumberField.setAccessible(true);
+
+        long contactNumber = contactNumberField.getLong(person);
+
+        Assertions.assertEquals(5555, uidNumber);
+        Assertions.assertEquals(452002, pinCode);
+        Assertions.assertEquals(123456789L, contactNumber);
+    }
+
+    @Test
+    public void whenGetFloatingTypeFields_thenSuccess() throws IllegalAccessException, IllegalArgumentException, NoSuchFieldException, NullPointerException {
+        Person person = new Person();
+
+        Field heightField = person.getClass()
+            .getDeclaredField("height");
+        heightField.setAccessible(true);
+
+        float height = heightField.getFloat(person);
+
+        Field weightField = person.getClass()
+            .getDeclaredField("weight");
+        weightField.setAccessible(true);
+
+        double weight = weightField.getDouble(person);
+
+        Assertions.assertEquals(6.1242f, height);
+        Assertions.assertEquals(75.2564, weight);
+    }
+
+    @Test
+    public void whenGetCharacterFields_thenSuccess() throws IllegalAccessException, IllegalArgumentException, NoSuchFieldException, NullPointerException {
+        Person person = new Person();
+
+        Field genderField = person.getClass()
+            .getDeclaredField("gender");
+        genderField.setAccessible(true);
+
+        char gender = genderField.getChar(person);
+
+        Assertions.assertEquals('M', gender);
+    }
+
+    @Test
+    public void whenGetBooleanFields_thenSuccess() throws IllegalAccessException, IllegalArgumentException, NoSuchFieldException, NullPointerException {
+        Person person = new Person();
+
+        Field activeField = person.getClass()
+            .getDeclaredField("active");
+        activeField.setAccessible(true);
+
+        boolean active = activeField.getBoolean(person);
+
+        Assertions.assertTrue(active);
+    }
+
     @Test
     public void givenInt_whenGetStringField_thenIllegalArgumentException() throws IllegalAccessException, IllegalArgumentException, NoSuchFieldException, NullPointerException {
         Person person = new Person();
-        Field fieldName = person.getClass()
+        Field nameField = person.getClass()
             .getDeclaredField("name");
-        fieldName.setAccessible(true);
+        nameField.setAccessible(true);
 
-        Assertions.assertThrows(IllegalArgumentException.class, () -> fieldName.getInt(person));
+        Assertions.assertThrows(IllegalArgumentException.class, () -> nameField.getInt(person));
     }
 
     @Test
     public void whenFieldNotSetAccessible_thenIllegalAccessException() throws IllegalAccessException, IllegalArgumentException, NoSuchFieldException, NullPointerException {
         Person person = new Person();
-        Field fieldName = person.getClass()
+        Field nameField = person.getClass()
             .getDeclaredField("name");
 
-        Assertions.assertThrows(IllegalAccessException.class, () -> fieldName.get(person));
+        Assertions.assertThrows(IllegalAccessException.class, () -> nameField.get(person));
     }
 
     @Test