Comparison of Key Features in Java 8, 11, and 17
| Feature | Java 8 | Java 11 | Java 17 |
|---|---|---|---|
| Lambda Expressions | Introduced lambda expressions for functional programming. | No new changes; continued support. | No new changes; continued support. |
| Stream API | Added Stream API for processing sequences of elements. | No new changes; continued support. | No new changes; continued support. |
| Optional Class | Introduced Optional to avoid null references. | No new changes; continued support. | No new changes; continued support. |
| Default Methods in Interfaces | Allowed interfaces to have default methods. | No new changes; continued support. | No new changes; continued support. |
| New Date and Time API | Introduced java.time package. | No new changes; continued support. | No new changes; continued support. |
| Nashorn JavaScript Engine | Introduced Nashorn for executing JavaScript. | Deprecated in later versions. | Removed Nashorn. |
| Garbage Collection | G1 Garbage Collector became the default. | Improved G1 GC, better performance. | Further improvements in G1 GC and new garbage collection options. |
| HTTP Client API | Not included. | Introduced a new HttpClient API. | Continued support and enhancements. |
| String Methods | New methods like String.join() added. | No new changes; continued support. | New methods such as String.repeat(), String.lines(), and String.strip(). |
| Local-Variable Type Inference | Not included. | Introduced var for local variable type inference. | Continued support for var. |
| Flight Recorder | Not available. | Introduced as an open-source feature. | Continued support with enhancements. |
| Sealed Classes | Not included. | Not included. | Introduced sealed classes for more control over inheritance. |
Pattern Matching for instanceof | Not included. | Not included. | Introduced for cleaner type checks. |
| Enhanced Switch Expressions | Not included. | Not included. | Introduced enhanced switch expressions for simpler syntax. |
| Deprecation of Applet API | Not included. | Deprecated the Applet API. | Continued deprecation; Applet API removed in future versions. |
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