# jjvm

**Repository Path**: sxudong/jjvm

## Basic Information

- **Project Name**: jjvm
- **Description**: Java手写JVM虚拟机，此项目的引用 http://www.jianshu.com/p/4d81465c2fb8 大牛的作品。
- **Primary Language**: Java
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 1
- **Forks**: 0
- **Created**: 2021-11-30
- **Last Updated**: 2024-08-31

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# JJvm

这是一个Java实现的JAVA虚拟机，它会非常简单，实际上简单的只够运行HelloWorld。虽然简单，但尽量符合 JVM 标准，目前主要参考依据是[《Java虚拟机规范 （Java SE 7 中文版）》](http://www.iteye.com/topic/1117824)。

关于此项目的说明，[详见此文](http://www.jianshu.com/p/4d81465c2fb8)。

项目地址：https://github.com/caoym/jjvm

## 运行

先写一个HelloWorld，代码如下：

```java
package org.caoym;

public class HelloWorld {
    public static void main(String[] args){
        System.out.println("Hello World");
    }
}
```

可以通过以下命令运行：

```shell
$ java /home/myclasspath org.caoym.jjvm.JJvm org.caoym.HelloWorld
Hello World
```

## 可运行的示例

[用于测试 JJvm 的示例代码可在此处下载](https://github.com/caoym/jjvm-samples)
```angular2html
PS F:\code\jjvm\target\clas
> org/caoym/samples/sample1/HelloWorld.main@0:GETSTATIC
> org/caoym/samples/sample1/HelloWorld.main@1:LDC
> org/caoym/samples/sample1/HelloWorld.main@2:INVOKEVIRTUAL
Hello World
> org/caoym/samples/sample1/HelloWorld.main@3:RETURN
```

```angular2html
PS F:\code\jjvm\target\classes> java org.caoym.jjvm.JJvm F:\code\jjvm\target\classes org.caoym.samples.sample2.Main Girl
> org/caoym/samples/sample2/Main.<clinit>@0:NEW
> org/caoym/samples/sample2/Main.<clinit>@1:DUP
> org/caoym/samples/sample2/Main.<clinit>@2:LDC
> org/caoym/samples/sample2/Main.<clinit>@3:INVOKESPECIAL
> org/caoym/samples/sample2/Speaker.<init>@0:ALOAD_0
> org/caoym/samples/sample2/Speaker.<init>@1:INVOKESPECIAL
> org/caoym/samples/sample2/Speaker.<init>@2:ALOAD_0
> org/caoym/samples/sample2/Speaker.<init>@3:LDC
> org/caoym/samples/sample2/Speaker.<init>@4:PUTFIELD
> org/caoym/samples/sample2/Speaker.<init>@5:ALOAD_0
> org/caoym/samples/sample2/Speaker.<init>@6:ALOAD_1
> org/caoym/samples/sample2/Speaker.<init>@7:PUTFIELD
> org/caoym/samples/sample2/Speaker.<init>@8:RETURN
> org/caoym/samples/sample2/Main.<clinit>@4:PUTSTATIC
> org/caoym/samples/sample2/Main.<clinit>@5:RETURN
> org/caoym/samples/sample2/Main.main@0:GETSTATIC
> org/caoym/samples/sample2/Main.main@1:ALOAD_0
> org/caoym/samples/sample2/Main.main@2:ICONST_0
> org/caoym/samples/sample2/Main.main@3:AALOAD
> org/caoym/samples/sample2/Main.main@4:INVOKEINTERFACE
> org/caoym/samples/sample2/Speaker.helloTo@0:GETSTATIC
> org/caoym/samples/sample2/Speaker.helloTo@1:NEW
> org/caoym/samples/sample2/Speaker.helloTo@2:DUP
> org/caoym/samples/sample2/Speaker.helloTo@3:INVOKESPECIAL
> org/caoym/samples/sample2/Speaker.helloTo@4:ALOAD_0
> org/caoym/samples/sample2/Speaker.helloTo@5:GETFIELD
> org/caoym/samples/sample2/Speaker.helloTo@6:INVOKEVIRTUAL
> org/caoym/samples/sample2/Speaker.helloTo@7:LDC
> org/caoym/samples/sample2/Speaker.helloTo@8:INVOKEVIRTUAL
> org/caoym/samples/sample2/Speaker.helloTo@9:ALOAD_1
> org/caoym/samples/sample2/Speaker.helloTo@10:INVOKEVIRTUAL
> org/caoym/samples/sample2/Speaker.helloTo@11:INVOKEVIRTUAL
> org/caoym/samples/sample2/Speaker.helloTo@12:INVOKEVIRTUAL
Hello Girl
> org/caoym/samples/sample2/Speaker.helloTo@13:RETURN
> org/caoym/samples/sample2/Main.main@5:RETURN
PS F:\code\jjvm\target\classes>
```

注意 maven 配置：
```angular2html
    <dependencies>
        <dependency>
            <groupId>jdk.tools</groupId>
            <artifactId>jdk.tools</artifactId>
            <version>1.8</version>
            <scope>system</scope>
            <!-- replace with your local path of the tools.jar-->
            <systemPath>C:/Java/jdk1.8.0_172/lib/tools.jar</systemPath>
        </dependency>
        <dependency>
            <groupId>jdk.rt</groupId>
            <artifactId>jdk.rt</artifactId>
            <version>1.8</version>
            <scope>system</scope>
            <!-- replace with your local path of the tools.jar-->
            <systemPath>C:/Java/jdk1.8.0_172/jre/lib/rt.jar</systemPath>
        </dependency>
    </dependencies>
```