什么是一个简单的 C/C++ 代码,它可以解释一个只包含 System.out.print () 语句的 java 类文件( 字码) 。 (我查看了简单的开源 JVMs 语句, 但是由于完整性, 它们比较复杂 。 )
或者我在哪里能找到一个解释清楚的翻译指南( 即 Java 字码的解释)
虽然一开始你的问题可能显得微不足道, 但这只是因为JVM的外表 多么好,
final class WorldGreeter {
public static void main(final String[] argv) {
System.out.println("Greetings, Earth!");
}
}
通过该规格的第五章,即 Loading, linking, and 初始化 ,阅读该规格的第五章,即loading, linking, and 初始化 ,你可以看到虚拟机器必须做很多工作才能运行最简单的程序。
为了指出所有这些复杂阶段的必要性,我假设你将使用标准 Oracle JDK ;根据,你将期待系统初始化。 需要相当一点工作, 即加载几个不同的班级, 更重要的是, 一个能工作的 JNI 层。
现在,你不需要使用甲骨文JDK执行程序... 当然,你可以使用更简单的设置, 但大部分的结构和工作 仍然处于装载、连接和初始化阶段。 它不像你的直觉告诉你的那么容易。
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