J2SE J2ME J2EE 标准版，开发适用于PC上运行的程序 微缩版，开发适用于手机等嵌入式设备的程序 企业版，开发适用于服务器端的程序 引入内部类和即时编译（Just-In-Time,JIT）技术 引入Swing 2000.5 2002.2 2004.10 2006.11 J2SE1.3 J2SE1.4 J2SE1.5 J2SE5.0 JavaSE6.0 支持XML，采用新的虚拟机Hotspot Linux JVM Mac 将程序代码从一种指令转换为另一种指令 解释器将字节码指令逐条解释成所在底层平台 能够处理的指令格式，解释一条执行一条 JIT, Just-In-Time 传统解释器的解释执行是转换一条，运行完后就将其扔掉；JIT 会自动检测指令的运行情况，并将使用频率高（如循环运行）的指令解释后保存下来， 下次调用时就无需再解释（相当于局部的编译执行），显著提高了 Java 的运行效率。

J2SE J2ME J2EE 标准版，开发适用于PC上运行的程序 微缩版，开发适用于手机等嵌入式设备的程序 企业版，开发适用于服务器端的程序 引入内部类和即时编译（Just-In-Time,JIT）技术 引入Swing 2000.5 2002.2 2004.10 2006.11 J2SE1.3 J2SE1.4 J2SE1.5 J2SE5.0 JavaSE6.0 支持XML，采用新的虚拟机Hotspot . . . . . . . . . . 中国海洋大学信息学院计算机系 第 5 页 / 共 306 页 1.3. JAVA 开发环境 � 1 � • JIT, Just-In-Time 传统解释器的解释执行是转换一条，运行完后就将其扔掉；JIT 会自动检测指令的运行情况，并将使用频率高（如循环运行）的指令解释后保存 下来，下次调用时就无需再解释（相当于局部的编译执行），显著提高了 Java 的

Thread utilization • The number of classes loaded and unloaded 534 • JVM version information • JIT compilation time System Metrics Auto-configuration enables system metrics by using core Micrometer architecture. The restored process retains all the capabilities of the HotSpot JVM, including further JIT optimizations at runtime. Based on the foundations provided by Spring Framework, Spring Boot provides

Thread utilization • The number of classes loaded and unloaded 534 • JVM version information • JIT compilation time System Metrics Auto-configuration enables system metrics by using core Micrometer architecture. The restored process retains all the capabilities of the HotSpot JVM, including further JIT optimizations at runtime. Based on the foundations provided by Spring Framework, Spring Boot provides

Thread utilization • The number of classes loaded and unloaded 532 • JVM version information • JIT compilation time System Metrics Auto-configuration enables system metrics by using core Micrometer architecture. The restored process retains all the capabilities of the HotSpot JVM, including further JIT optimizations at runtime. Based on the foundations provided by Spring Framework, Spring Boot provides

Thread utilization • The number of classes loaded and unloaded 534 • JVM version information • JIT compilation time System Metrics Auto-configuration enables system metrics by using core Micrometer architecture. The restored process retains all the capabilities of the HotSpot JVM, including further JIT optimizations at runtime. Based on the foundations provided by Spring Framework, Spring Boot provides

Thread utilization • The number of classes loaded and unloaded 532 • JVM version information • JIT compilation time System Metrics Auto-configuration enables system metrics by using core Micrometer architecture. The restored process retains all the capabilities of the HotSpot JVM, including further JIT optimizations at runtime. Based on the foundations provided by Spring Framework, Spring Boot provides

Thread utilization • The number of classes loaded and unloaded 534 • JVM version information • JIT compilation time System Metrics Auto-configuration enables system metrics by using core Micrometer architecture. The restored process retains all the capabilities of the HotSpot JVM, including further JIT optimizations at runtime. Based on the foundations provided by Spring Framework, Spring Boot provides

Thread utilization • The number of classes loaded and unloaded 534 • JVM version information • JIT compilation time System Metrics Auto-configuration enables system metrics by using core Micrometer architecture. The restored process retains all the capabilities of the HotSpot JVM, including further JIT optimizations at runtime. Based on the foundations provided by Spring Framework, Spring Boot provides

Thread utilization • The number of classes loaded and unloaded 534 • JVM version information • JIT compilation time System Metrics Auto-configuration enables system metrics by using core Micrometer architecture. The restored process retains all the capabilities of the HotSpot JVM, including further JIT optimizations at runtime. Based on the foundations provided by Spring Framework, Spring Boot provides