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Merge pull request #9760 from umangbudhwar/master

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BAEL-4329: Set field value with reflection
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Jonathan Cook 2020-08-08 20:43:56 +02:00 committed by GitHub
commit 8da19e2b88
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core-java-modules/core-java-reflection-2/src/test/java/com/baeldung/reflection/set/fields/SetFieldsUsingReflectionUnitTest.java Normal file
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package com.baeldung.reflection.set.fields;
import java.lang.reflect.Field;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
import com.baeldung.reflection.access.privatefields.Person;
public class SetFieldsUsingReflectionUnitTest {
@Test
public void whenSetIntegerFields_thenSuccess() throws Exception {
Person person = new Person();
Field ageField = person.getClass()
.getDeclaredField("age");
ageField.setAccessible(true);
byte age = 26;
ageField.setByte(person, age);
Assertions.assertEquals(age, person.getAge());
Field uidNumberField = person.getClass()
.getDeclaredField("uidNumber");
uidNumberField.setAccessible(true);
short uidNumber = 5555;
uidNumberField.setShort(person, uidNumber);
Assertions.assertEquals(uidNumber, person.getUidNumber());
Field pinCodeField = person.getClass()
.getDeclaredField("pinCode");
pinCodeField.setAccessible(true);
int pinCode = 411057;
pinCodeField.setInt(person, pinCode);
Assertions.assertEquals(pinCode, person.getPinCode());
Field contactNumberField = person.getClass()
.getDeclaredField("contactNumber");
contactNumberField.setAccessible(true);
long contactNumber = 123456789L;
contactNumberField.setLong(person, contactNumber);
Assertions.assertEquals(contactNumber, person.getContactNumber());
}
@Test
public void whenDoUnboxing_thenSuccess() throws Exception {
Person person = new Person();
Field pinCodeField = person.getClass()
.getDeclaredField("pinCode");
pinCodeField.setAccessible(true);
Integer pinCode = 411057;
pinCodeField.setInt(person, pinCode);
Assertions.assertEquals(pinCode, person.getPinCode());
}
@Test
public void whenDoNarrowing_thenSuccess() throws Exception {
Person person = new Person();
Field pinCodeField = person.getClass()
.getDeclaredField("pinCode");
pinCodeField.setAccessible(true);
short pinCode = 4110;
pinCodeField.setInt(person, pinCode);
Assertions.assertEquals(pinCode, person.getPinCode());
}
@Test
public void whenSetFloatingTypeFields_thenSuccess() throws Exception {
Person person = new Person();
Field heightField = person.getClass()
.getDeclaredField("height");
heightField.setAccessible(true);
float height = 6.1242f;
heightField.setFloat(person, height);
Assertions.assertEquals(height, person.getHeight());
Field weightField = person.getClass()
.getDeclaredField("weight");
weightField.setAccessible(true);
double weight = 75.2564;
weightField.setDouble(person, weight);
Assertions.assertEquals(weight, person.getWeight());
}
@Test
public void whenSetCharacterFields_thenSuccess() throws Exception {
Person person = new Person();
Field genderField = person.getClass()
.getDeclaredField("gender");
genderField.setAccessible(true);
char gender = 'M';
genderField.setChar(person, gender);
Assertions.assertEquals(gender, person.getGender());
}
@Test
public void whenSetBooleanFields_thenSuccess() throws Exception {
Person person = new Person();
Field activeField = person.getClass()
.getDeclaredField("active");
activeField.setAccessible(true);
activeField.setBoolean(person, true);
Assertions.assertTrue(person.isActive());
}
@Test
public void whenSetObjectFields_thenSuccess() throws Exception {
Person person = new Person();
Field nameField = person.getClass()
.getDeclaredField("name");
nameField.setAccessible(true);
String name = "Umang Budhwar";
nameField.set(person, name);
Assertions.assertEquals(name, person.getName());
}
@Test
public void givenInt_whenSetStringField_thenIllegalArgumentException() throws Exception {
Person person = new Person();
Field nameField = person.getClass()
.getDeclaredField("name");
nameField.setAccessible(true);
Assertions.assertThrows(IllegalArgumentException.class, () -> nameField.setInt(person, 26));
}
@Test
public void givenInt_whenSetLongField_thenIllegalArgumentException() throws Exception {
Person person = new Person();
Field pinCodeField = person.getClass()
.getDeclaredField("pinCode");
pinCodeField.setAccessible(true);
long pinCode = 411057L;
Assertions.assertThrows(IllegalArgumentException.class, () -> pinCodeField.setLong(person, pinCode));
}
@Test
public void whenFieldNotSetAccessible_thenIllegalAccessException() throws Exception {
Person person = new Person();
Field nameField = person.getClass()
.getDeclaredField("name");
Assertions.assertThrows(IllegalAccessException.class, () -> nameField.set(person, "Umang Budhwar"));
}
@Test
public void whenAccessingWrongProperty_thenNoSuchFieldException() throws Exception {
Person person = new Person();
Assertions.assertThrows(NoSuchFieldException.class, () -> person.getClass()
.getDeclaredField("firstName"));
}
@Test
public void whenAccessingNullProperty_thenNullPointerException() throws Exception {
Person person = new Person();
Assertions.assertThrows(NullPointerException.class, () -> person.getClass()
.getDeclaredField(null));
}
}