Simple Java Class Reader

learning by inventing

this project aimed at learning the class file format in jvm8 spec. main code written in golang

Class File Format

ClassFile {
    u4             magic;
    u2             minor_version;
    u2             major_version;
    u2             constant_pool_count;
    cp_info        constant_pool[constant_pool_count-1];
    u2             access_flags;
    u2             this_class;
    u2             super_class;
    u2             interfaces_count;
    u2             interfaces[interfaces_count];
    u2             fields_count;
    field_info     fields[fields_count];
    u2             methods_count;
    method_info    methods[methods_count];
    u2             attributes_count;
    attribute_info attributes[attributes_count];
}

project progress

• magic
• major and minor version
• constant pool
• access flags
• this class
• super class
• interfaces
• fields
• methods
• attributes

how to run

$ go build .
$ ./java-simple-class-reader -f /path/to/class/file

Of course, there is a example class file named Test.class.