A package that includes the JVM plus the core class libraries and configuration files needed to run Java apps.
| Metric | JRE 17 (OpenJDK) | Native C++ | |--------|----------------|------------| | Startup time (simple CLI) | 120–200 ms | 5–15 ms | | Memory overhead (empty app) | 12–18 MB | ~2 MB | | Throughput (numeric compute) | 85–95% of C++ | 100% | java runtime environment
Decades of optimization make the JRE rock-solid for long-running server applications. Garbage collection and memory management are best-in-class for a managed runtime. A package that includes the JVM plus the
New users often download the JDK (Java Development Kit) by mistake, thinking it’s the JRE. Oracle’s website doesn’t make this distinction obvious. (Tip: If you just want to run apps, get the JRE; if you want to write code , get the JDK.) New users often download the JDK (Java Development
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