BAEL-4089: Accesing private properties of a class in Java (#9441)
* Added code to access private properties of a class * Removed abstractions to increase simplicity. * Added unit test cases in givenX_whenY_thenZ format. * Included test cases for NoSuchFieldException, NoSuchMethodException and NullPointerException. * Added new test case for IllegalArgumentException * Removed test cases for getting private methods * Added test cases for accessing all data types. * Segregated test cases for primitive and object types. Added test case for Autoboxing. * Condensed fields by removing extra space. * Added test case for widening. * Refactored test cases to throw generic Exception * Created new module core-java-reflection-2 * Revert "Created new module core-java-reflection-2" This reverts commit 9568663bb2e176eacc2119e605be76577f90b9c6. * Added new module core-java-reflection-2 * Removed README.MD
This commit is contained in:
Umang Budhwar
GitHub
parent
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>core-java-reflection-2</artifactId>
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<version>0.1.0-SNAPSHOT</version>
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<name>core-java-reflection-2</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung.core-java-modules</groupId>
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<artifactId>core-java-modules</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../</relativePath>
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</parent>
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<build>
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<finalName>core-java-reflection-2</finalName>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>${maven-compiler-plugin.version}</version>
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<configuration>
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<source>${source.version}</source>
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<target>${target.version}</target>
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<compilerArgument>-parameters</compilerArgument>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<maven-compiler-plugin.version>3.8.0</maven-compiler-plugin.version>
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<source.version>1.8</source.version>
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<target.version>1.8</target.version>
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</properties>
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</project>
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package com.baeldung.reflection.access.privatefields;
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public class Person {
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private String name = "John";
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private byte age = 30;
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private short uidNumber = 5555;
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private int pinCode = 452002;
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private long contactNumber = 123456789L;
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private float height = 6.1242f;
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private double weight = 75.2564;
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private char gender = 'M';
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private boolean active = true;
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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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package com.baeldung.reflection.access.privatefields;
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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 AccessPrivateFieldsUnitTest {
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@Test
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public void whenGetIntegerFields_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 = ageField.getByte(person);
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Assertions.assertEquals(30, age);
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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 = uidNumberField.getShort(person);
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Assertions.assertEquals(5555, uidNumber);
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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 = pinCodeField.getInt(person);
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Assertions.assertEquals(452002, pinCode);
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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 = contactNumberField.getLong(person);
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Assertions.assertEquals(123456789L, contactNumber);
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}
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@Test
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public void whenDoAutoboxing_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 = pinCodeField.getInt(person);
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Assertions.assertEquals(452002, pinCode);
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}
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@Test
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public void whenDoWidening_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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Long pinCode = pinCodeField.getLong(person);
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Assertions.assertEquals(452002L, pinCode);
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}
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@Test
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public void whenGetFloatingTypeFields_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 = heightField.getFloat(person);
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Assertions.assertEquals(6.1242f, height);
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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 = weightField.getDouble(person);
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Assertions.assertEquals(75.2564, weight);
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}
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@Test
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public void whenGetCharacterFields_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 = genderField.getChar(person);
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Assertions.assertEquals('M', gender);
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}
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@Test
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public void whenGetBooleanFields_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 = activeField.getBoolean(person);
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Assertions.assertTrue(active);
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}
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@Test
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public void whenGetObjectFields_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 = (String) nameField.get(person);
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Assertions.assertEquals("John", name);
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}
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@Test
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public void givenInt_whenGetStringField_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.getInt(person));
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}
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@Test
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public void givenInt_whenGetLongField_thenIllegalArgumentException() throws Exception {
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Person person = new Person();
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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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Assertions.assertThrows(IllegalArgumentException.class, () -> contactNumberField.getInt(person));
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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.get(person));
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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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@ -111,6 +111,7 @@
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<module>core-java-perf</module>
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<module>core-java-reflection</module>
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<module>core-java-reflection-2</module>
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<module>core-java-security</module>
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<module>core-java-security-2</module>
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