Objectives :
- What is DVM?
- What is Dalvik Virtual Machine?
- What is JVM?
- What is Java Virtual Machine?
- What are the differences between DVM & JVM?
- What are the differences between Dalvik Virtual Machine & Java Virtual Machine?
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DVM (Dalvik Virtual Machine) |
JVM (Java Virtual Machine) |
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It is Register based which is designed to run on low memory. |
It is Stack based. |
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DVM uses its own byte code and runs “.Dex” file. From Android 2.2 SDK Dalvik has got a Just in Time compiler |
JVM uses java byte code and runs “.class” file having JIT (Just In Time). |
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DVM has been designed so that a device can run multiple instances of the VM efficiently. Applications are given their own instance. |
Single instance of JVM is shared with multiple applications. |
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DVM supports Android operating system only. |
JVM supports multiple operating systems. |
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For DVM very few Re-tools are available. |
For JVM many Re-tools are available. |
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There is constant pool for every application. |
It has constant pool for every class. |
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Here the executable is APK. |
Here the executable is JAR. |