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dupirefr
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[BAEL-2424] Added classes and tests
1 parent 956c2e7 commit 994cb30

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‎core-java/src/main/java/com/baeldung/reflection/Employee.java‎

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package com.baeldung.reflection;
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public class Employee extends Person {
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public int employeeId;
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}

‎core-java/src/main/java/com/baeldung/reflection/MonthEmployee.java‎

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package com.baeldung.reflection;
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public class MonthEmployee extends Employee {
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private double reward;
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}

‎core-java/src/main/java/com/baeldung/reflection/Person.java‎

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package com.baeldung.reflection;
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public class Person {
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public String lastName;
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private String firstName;
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}

‎core-java/src/test/java/com/baeldung/reflection/PersonAndEmployeeReflectionTest.java‎

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package com.baeldung.reflection;
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import org.junit.Test;
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import java.lang.reflect.Field;
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import java.util.ArrayList;
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import java.util.Arrays;
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import java.util.Collections;
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import java.util.List;
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import static org.junit.Assert.*;
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public class PersonAndEmployeeReflectionTest {
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// Fields names
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private static final String LAST_NAME_FIELD = "lastName";
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private static final String FIRST_NAME_FIELD = "firstName";
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private static final String EMPLOYEE_ID_FIELD = "employeeId";
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private static final String MONTH_EMPLOYEE_REWARD_FIELD = "reward";
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@Test
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public void givenPersonClass_whenGetDeclaredFields_thenTwoFields() {
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// When
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Field[] allFields = Person.class.getDeclaredFields();
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// Then
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assertEquals(2, allFields.length);
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Field lastNameField = allFields[0];
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assertEquals(LAST_NAME_FIELD, lastNameField.getName());
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assertEquals(String.class, lastNameField.getType());
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Field firstNameField = allFields[1];
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assertEquals(FIRST_NAME_FIELD, firstNameField.getName());
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assertEquals(String.class, firstNameField.getType());
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}
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@Test
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public void givenEmployeeClass_whenSuperClassGetDeclaredFields_thenOneField() {
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// When
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Field[] allFields = Employee.class.getSuperclass().getDeclaredFields();
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// Then
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assertEquals(2, allFields.length);
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Field lastNameField = allFields[0];
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assertEquals(LAST_NAME_FIELD, lastNameField.getName());
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assertEquals(String.class, lastNameField.getType());
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Field firstNameField = allFields[1];
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assertEquals(FIRST_NAME_FIELD, firstNameField.getName());
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assertEquals(String.class, firstNameField.getType());
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}
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@Test
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public void givenEmployeeClass_whenGetDeclaredFields_thenOneField() {
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// When
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Field[] allFields = Employee.class.getDeclaredFields();
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// Then
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assertEquals(1, allFields.length);
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Field employeeIdField = allFields[0];
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assertEquals(EMPLOYEE_ID_FIELD, employeeIdField.getName());
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assertEquals(int.class, employeeIdField.getType());
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}
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@Test
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public void givenEmployeeClass_whenGetDeclaredFieldsOnBothClasses_thenThreeFields() {
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// When
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Field[] personFields = Employee.class.getSuperclass().getDeclaredFields();
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Field[] employeeFields = Employee.class.getDeclaredFields();
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Field[] allFields = new Field[employeeFields.length + personFields.length];
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Arrays.setAll(allFields, i -> (i < personFields.length ? personFields[i] : employeeFields[i - personFields.length]));
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// Then
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assertEquals(3, allFields.length);
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Field lastNameField = allFields[0];
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assertEquals(LAST_NAME_FIELD, lastNameField.getName());
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assertEquals(String.class, lastNameField.getType());
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Field firstNameField = allFields[1];
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assertEquals(FIRST_NAME_FIELD, firstNameField.getName());
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assertEquals(String.class, firstNameField.getType());
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Field employeeIdField = allFields[2];
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assertEquals(EMPLOYEE_ID_FIELD, employeeIdField.getName());
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assertEquals(int.class, employeeIdField.getType());
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}
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@Test
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public void givenMonthEmployeeClass_whenGetAllFields_thenFourFields() {
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// When
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List<Field> allFields = getAllFields(MonthEmployee.class);
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// Then
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assertEquals(4, allFields.size());
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Field lastNameField = allFields.get(0);
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assertEquals(LAST_NAME_FIELD, lastNameField.getName());
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assertEquals(String.class, lastNameField.getType());
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Field firstNameField = allFields.get(1);
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assertEquals(FIRST_NAME_FIELD, firstNameField.getName());
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assertEquals(String.class, firstNameField.getType());
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Field employeeIdField = allFields.get(2);
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assertEquals(EMPLOYEE_ID_FIELD, employeeIdField.getName());
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assertEquals(int.class, employeeIdField.getType());
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Field monthEmployeeRewardField = allFields.get(3);
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assertEquals(MONTH_EMPLOYEE_REWARD_FIELD, monthEmployeeRewardField.getName());
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assertEquals(double.class, monthEmployeeRewardField.getType());
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}
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public List<Field> getAllFields(Class clazz) {
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if (clazz == null) {
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return Collections.emptyList();
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}
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List<Field> result = new ArrayList<>();
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result.addAll(getAllFields(clazz.getSuperclass()));
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result.addAll(Arrays.asList(clazz.getDeclaredFields()));
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return result;
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}
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}

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