Yes, the Oracle certifications for Java can prove your skills and expertise in Java. You can find the following notable certification exams for proving Java knowledge and expertise.

Java Foundations Certified Junior Associate (1Z0-811).
Oracle Certified Associate Java SE8 Programmer (1Z0-808).
Oracle Certified Professional Java SE8 Programmer (1Z0-809).
Oracle Certified Professional Java EE 7 Application Developer (1Z0-900).
Oracle Certified Professional Java SE11 Programmer I (1Z0-815).
Oracle Certified Professional Java SE11 Programmer II (1Z0-816).
Oracle Certified Professional Java SE11 Developer (Upgrade) (1Z0-817).
Oracle Certified Master Java (EE) Enterprise Architect (1Z0-865)
Oracle Certified Master Java (EE) Enterprise Architect Essay (1Z0-866)
Oracle Certified Master Java EE6 Enterprise Architect (1Z0-807).

Note: As a beginner, it is recommended to start with Java Foundations certification and then moving ahead level by level.