It had been optimised so that it can fit in with low-powered devices.
Since everything in mobiles is very limited whether it would be a battery life, processing and memory etc. Similarly to JVM, it also uses the JIT compiler. It was a purpose specific VM and was strictly created for mobile devices. DVM (Dalvik Virtual Machine) was created by Dan Bornstein and his team, keeping in mind only the constraints of a mobile device. DVM is stands for ‘Delvik Virtual Machine’. Thats why another Virtual machine was designed specifically for mobile devices and that is Delvik Virtual Machine (DVM). It would be but though JVM is high performance and provides excellent memory management, it needs to be optimized for low-powered handheld devices as well. What are you thinking ? as java code execution works by JVM and android uses java. class file ready then you can give this file to any platform and it will convert it to native machine code. This bytecode is given to the JVM which converts it into machine code.Īs you can see from the image above, once you have. Which means javac compiler does not convert Java code directly to machine code like other compiler does. 
For example: If we have a Hello.java class and when we run this class file then javac compiler/Java Compiler turns this source code to Hello.class file which is bytecode.
In JVM, The Java compiler converts the. 
Java bytecode can be run on any machine capable of running JVM.JVM is platform dependent and different implementations are available for specific platforms.To maintain the platform independency of the code, JAVA developed JVM i.e.
It meaning even if an app is compiled on platform such as a PC, it can still be executed on the mobile platform using the virtual machine.
It provides cross compatibility or platform independency. It makes the Android OS more stable and reliable. So even if any code contains some malicious code won’t directly affect the system files. The application code is isolated from the core OS. Virtual Machine enables the same code to be run on multiple platform independent of the underlying hardware.įor example: the JVM runs java bytecode and produces same output on multiple platforms.Īndroid also makes use of a virtual machine to run the APK files. It’s job is to convert language specific code to a format compatible to run on the Virtual Machine. Virtual Machine is an abstraction over the native machine backed by the resources of the native machine. Before that we should a clear idea on Virtual Machine (VM) What is Virtual Machine (VM) Why Android depreciated DVM and started to use ARTĪs we are going to know why android use virtual machine. So in this guide, I’m going to answer the following questions It’s really important to understand that how android app works and what components are used to make android device work.
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