Added code to set a field using Reflection.
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Umang Budhwar
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7e89531ef6
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0a2f6a4615
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package com.baeldung.reflection.set.fields;
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public class Person {
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private String name;
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private byte age;
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private short uidNumber;
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private int pinCode;
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private long contactNumber;
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private float height;
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private double weight;
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private char gender;
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private boolean active;
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public byte getAge() {
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return age;
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}
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public void setAge(byte age) {
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this.age = age;
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}
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public short getUidNumber() {
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return uidNumber;
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}
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public void setUidNumber(short uidNumber) {
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this.uidNumber = uidNumber;
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}
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public int getPinCode() {
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return pinCode;
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}
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public void setPinCode(int pinCode) {
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this.pinCode = pinCode;
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}
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public long getContactNumber() {
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return contactNumber;
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}
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public void setContactNumber(long contactNumber) {
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this.contactNumber = contactNumber;
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}
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public float getHeight() {
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return height;
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}
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public void setHeight(float height) {
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this.height = height;
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}
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public double getWeight() {
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return weight;
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}
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public void setWeight(double weight) {
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this.weight = weight;
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}
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public char getGender() {
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return gender;
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}
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public void setGender(char gender) {
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this.gender = gender;
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}
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public boolean isActive() {
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return active;
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}
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public void setActive(boolean active) {
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this.active = active;
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}
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}
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@ -0,0 +1,182 @@
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package com.baeldung.reflection.set.fields;
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import java.lang.reflect.Field;
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import org.junit.jupiter.api.Assertions;
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import org.junit.jupiter.api.Test;
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public class SetFieldsUsingReflectionUnitTest {
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@Test
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public void whenSetIntegerFields_thenSuccess() throws Exception {
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Person person = new Person();
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Field ageField = person.getClass()
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.getDeclaredField("age");
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ageField.setAccessible(true);
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byte age = 26;
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ageField.setByte(person, age);
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Assertions.assertEquals(26, person.getAge());
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Field uidNumberField = person.getClass()
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.getDeclaredField("uidNumber");
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uidNumberField.setAccessible(true);
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short uidNumber = 5555;
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uidNumberField.setShort(person, uidNumber);
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Assertions.assertEquals(5555, person.getUidNumber());
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Field pinCodeField = person.getClass()
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.getDeclaredField("pinCode");
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pinCodeField.setAccessible(true);
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int pinCode = 411057;
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pinCodeField.setInt(person, pinCode);
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Assertions.assertEquals(411057, person.getPinCode());
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Field contactNumberField = person.getClass()
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.getDeclaredField("contactNumber");
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contactNumberField.setAccessible(true);
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long contactNumber = 123456789L;
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contactNumberField.setLong(person, contactNumber);
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Assertions.assertEquals(123456789L, person.getContactNumber());
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}
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@Test
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public void whenDoUnboxing_thenSuccess() throws Exception {
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Person person = new Person();
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Field pinCodeField = person.getClass()
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.getDeclaredField("pinCode");
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pinCodeField.setAccessible(true);
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Integer pinCode = 411057;
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pinCodeField.setInt(person, pinCode);
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Assertions.assertEquals(411057, person.getPinCode());
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}
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@Test
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public void whenDoNarrowing_thenSuccess() throws Exception {
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Person person = new Person();
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Field pinCodeField = person.getClass()
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.getDeclaredField("pinCode");
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pinCodeField.setAccessible(true);
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Short pinCode = 4110;
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pinCodeField.setInt(person, pinCode);
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Assertions.assertEquals(4110, person.getPinCode());
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}
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@Test
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public void whenSetFloatingTypeFields_thenSuccess() throws Exception {
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Person person = new Person();
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Field heightField = person.getClass()
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.getDeclaredField("height");
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heightField.setAccessible(true);
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float height = 6.1242f;
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heightField.setFloat(person, height);
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Assertions.assertEquals(6.1242f, person.getHeight());
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Field weightField = person.getClass()
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.getDeclaredField("weight");
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weightField.setAccessible(true);
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double weight = 75.2564;
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weightField.setDouble(person, weight);
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Assertions.assertEquals(75.2564, person.getWeight());
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}
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@Test
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public void whenSetCharacterFields_thenSuccess() throws Exception {
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Person person = new Person();
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Field genderField = person.getClass()
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.getDeclaredField("gender");
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genderField.setAccessible(true);
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char gender = 'M';
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genderField.setChar(person, gender);
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Assertions.assertEquals('M', person.getGender());
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}
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@Test
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public void whenSetBooleanFields_thenSuccess() throws Exception {
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Person person = new Person();
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Field activeField = person.getClass()
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.getDeclaredField("active");
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activeField.setAccessible(true);
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boolean active = true;
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activeField.setBoolean(person, active);
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Assertions.assertTrue(person.isActive());
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}
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@Test
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public void whenSetObjectFields_thenSuccess() throws Exception {
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Person person = new Person();
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Field nameField = person.getClass()
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.getDeclaredField("name");
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nameField.setAccessible(true);
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String name = "Umang Budhwar";
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nameField.set(person, name);
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Assertions.assertEquals("Umang Budhwar", person.getName());
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}
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@Test
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public void givenInt_whenSetStringField_thenIllegalArgumentException() throws Exception {
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Person person = new Person();
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Field nameField = person.getClass()
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.getDeclaredField("name");
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nameField.setAccessible(true);
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Assertions.assertThrows(IllegalArgumentException.class, () -> nameField.setInt(person, 26));
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}
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@Test
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public void givenInt_whenSetLongField_thenIllegalArgumentException() throws Exception {
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Person person = new Person();
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Field pinCodeField = person.getClass()
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.getDeclaredField("pinCode");
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pinCodeField.setAccessible(true);
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long pinCode = 411057L;
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Assertions.assertThrows(IllegalArgumentException.class, () -> pinCodeField.setLong(person, pinCode));
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}
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@Test
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public void whenFieldNotSetAccessible_thenIllegalAccessException() throws Exception {
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Person person = new Person();
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Field nameField = person.getClass()
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.getDeclaredField("name");
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Assertions.assertThrows(IllegalAccessException.class, () -> nameField.set(person, "Umang Budhwar"));
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}
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@Test
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public void whenAccessingWrongProperty_thenNoSuchFieldException() throws Exception {
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Person person = new Person();
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Assertions.assertThrows(NoSuchFieldException.class, () -> person.getClass()
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.getDeclaredField("firstName"));
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}
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@Test
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public void whenAccessingNullProperty_thenNullPointerException() throws Exception {
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Person person = new Person();
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Assertions.assertThrows(NullPointerException.class, () -> person.getClass()
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.getDeclaredField(null));
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}
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}
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