[BAEL-5788] Accessing Private Constructor

This commit is contained in:
Stef Serban-Cristian 2023-01-24 11:25:30 +02:00
parent 3af60557bd
commit c467321957
4 changed files with 95 additions and 0 deletions

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### Relevant Articles:
- [Reading the Value of private Fields from a Different Class in Java](https://www.baeldung.com/java-reflection-read-private-field-value)
- [Set Field Value With Reflection](https://www.baeldung.com/java-set-private-field-value)
- [Checking If a Method is Static Using Reflection in Java](https://www.baeldung.com/java-check-method-is-static)
- [Checking if a Java Class is abstract Using Reflection](https://www.baeldung.com/java-reflection-is-class-abstract)
- [Invoking a Private Method in Java](https://www.baeldung.com/java-call-private-method)
- [Finding All Classes in a Java Package](https://www.baeldung.com/java-find-all-classes-in-package)
- [Invoke a Static Method Using Java Reflection API](https://www.baeldung.com/java-invoke-static-method-reflection)
- [What Is the JDK com.sun.proxy.$Proxy Class?](https://www.baeldung.com/jdk-com-sun-proxy)

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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-reflection-private-constructor</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-reflection-private-constructor</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung.core-java-modules</groupId>
<artifactId>core-java-modules</artifactId>
<version>0.0.1-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.reflections</groupId>
<artifactId>reflections</artifactId>
<version>${reflections.version}</version>
</dependency>
</dependencies>
<build>
<finalName>core-java-reflection-private-constructor</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${source.version}</source>
<target>${target.version}</target>
<compilerArgument>-parameters</compilerArgument>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<reflections.version>0.9.12</reflections.version>
<source.version>1.8</source.version>
<target.version>1.8</target.version>
<spring.version>5.3.4</spring.version>
</properties>
</project>

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package com.baeldung.reflection;
public class PrivateConstructorClass {
private PrivateConstructorClass() {
System.out.println("Used the private constructor!");
}
}

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package com.baeldung.reflection;
import java.lang.reflect.Constructor;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
public class PrivateConstructorUnitTest {
@Test
public void whenConstructorIsPrivate_thenInstanceSuccess() throws Exception {
Constructor<PrivateConstructorClass> pcc = PrivateConstructorClass.class.getDeclaredConstructor();
pcc.setAccessible(true);
PrivateConstructorClass privateConstructorInstance = pcc.newInstance();
Assertions.assertTrue(privateConstructorInstance instanceof PrivateConstructorClass);
}
}