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Of course, .dex files are for the Dalvik VM of Android and .class files are for the JVM. But I wonder if they have similar layouts (Constant Pool, Fields, Methods, Attributes, ...)? The bytecode is different, but are there Dalvik specific opcode equivalents to the ones from the JVM?
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What is a Dex file? A Dex file contains code which is ultimately executed by the Android Runtime. Every APK has a single classes. dex file, which references any classes or methods used within an app.
bat --dex' command that can be used to convert Java byte code (. class) files into a Dalvik executable (. dex) file. The next tool used in the "ant -verbose debug" command is the "dex" tool, which converts Java byte code into a .
A Java class file is a file (with the . class filename extension) containing Java bytecode that can be executed on the Java Virtual Machine (JVM). A Java class file is usually produced by a Java compiler from Java programming language source files ( .
A DEX file is an executable file saved in a format that contains compiled code written for Android, Google's Linux-based mobile phone platform. It is technically referred to as a "Dalvik Executable," and can be interpreted by the Dalvik virtual machine.
Whereas a Java jar file has many class files, each APK file has only a single classes.dex file, as shown below. According to Google, the APK format differs from the class-file format for performance and security reasons.
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There's a Dex File Format and the Class File Format specification from the respective company.
These 2 files are completely different.
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