If you are a Java programmer with some experience or a junior Java programmer, I suggest getting a Java SE Programmer certification. This should be for version 11 or higher. A certification ensures that one has a good rounded knowledge of the capabilities (and the usage) of the language and also good programming practices in Java. Sometimes, work place experience even after a few years can provide a limited exposure to the language.
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If you are a Java programmer with some experience or a junior Java programmer, I suggest getting a Java SE Programmer certification. This should be for version 11 or higher. A certification ensures that one has a good rounded knowledge of the capabilities (and the usage) of the language and also good programming practices in Java. Sometimes, work place experience even after a few years can provide a limited exposure to the language.