Some are, the intellij java community edition is even open source. The paid ones are not too expensive, I pay around 200€ yearly for the all products pack and that's definitely worth it for a professional developer. If you are a student or open source developer, you can apply for free versions also.
Some are, the intellij java community edition is even open source. The paid ones are not too expensive, I pay around 200€ yearly for the all products pack and that's definitely worth it for a professional developer. If you are a student or open source developer, you can apply for free versions also.