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案例介绍异常处理是java语言非常重要的一个语法，本章主要实现如何处理抛出的异常。在Java语言中，异常可以分为两类：Checked异常和Unchecked异常。Unchecked异常包括java.lang.RuntimeException、java.lang.Error以及它们的子类，提前异常都是...

用Java实现JVM第九章《本地方法调用》

案例介绍本章主要介绍用java实现一些本地方法类库，并初始化本地方法，之后通过反射命令来调用本地方法。Java虚拟机和Java类库一起构成了Java运行时环境。Java类库主要用Java语言编写，一些无法用Java语言实现的方法则使用本地语言编写，这额方法叫作本地方法。OpenJDK类库中的本地方法...

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用Java实现JVM第八章《数组和字符串》

案例介绍本章主要介绍如何实现让虚拟机处理数组和字符串，在虚拟机功能增强后，我们可以执行数组类型计算和输出字符串。本章需要新增实现数组指令；newarray、anewarray、arraylength、<t>aload、<t>astore、multianewarray、ldc，...

用Java实现JVM第七章《方法调用和返回》

案例介绍本章节主要用java实现；方法调用指令、返回指令、解析方法符号引用、参数传递等。实现新的指令后我们的虚拟机就可以执行稍微复杂的运算并输出结果。从调用的角度来看，方法可以分为两类：静态方法（或者类方法）和实例方法。静态方法通过类类调用，实例方法则通过对象引用来调用。静态方法是静态绑定的，也就是...

用Java实现JVM第六章《类和对象》

案例介绍本案例通过java代码实现jvm规范中指令集和解释器，完成后就可以开始执行1到100的加和计算。Java虚拟机顾名思义，就是一台虚拟的机器，而字节码（bytecode）就是运行在这台虚拟机器上的机器码。我们已经知道，每一个类或者接口都会被Java编译器编译成一个class文件，类或接口的方法...

用Java实现JVM第一章《命令行工具》

背景描述为了更好的学习jvm阅读过《Java虚拟机规范》、《自己动手写Java虚拟机》，尤其是《自动动手写java虚拟机》可以更加清晰的看到全貌。对于程序开发者来说学习一个新东西最好事必躬亲，亲力亲为的做出一些demo，只有输出了结果心里才踏实。案例简述本章节主要是通过编写java代码，从main方...

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