Method and system for loading java class on virtual machine of android system

Abstract

The invention discloses a method and a system for loading java class on a virtual machine of an android system. The method comprises the following steps that an external java class generator of the android system pre-loads and links required java class, and structural information corresponding to the java class is obtained; the external java class generator looks up the loading situation of the structural information in the virtual machine of the android system according to the structural information, if the structural information is loaded in the virtual machine, the virtual machine forbids memory allocation for the structural information, and if the structural information is not loaded in the virtual machine, the virtual machine establishes a corresponding C-language source file according to the structural information; the virtual machine obtains a corresponding binary-form java class file according to the C-language source file and saving the binary-form java class file in a read-only memory area; when the android system is started initially, the virtual machine looks up the binary-form java class file and performs direct loading. The java class in the virtual machine is pre-generated and memorized in a read-only memory (ROM) for usage, the loading and linking time of the java class in the virtual machine is shortened, and the execution efficiency of android programs can be improved.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method and system for loading java classes on a virtual machine of an android system. Background technique [0002] At present, the Dalvik VM of the Android system of the mobile terminal loads classes into memory in the following ways: figure 1 As shown, firstly the Android system decides whether a class file is needed (S10), if necessary, loads the JAR file (S12), checks whether there is a classes.dex file in the JAR file (S14), and if it exists, decompresses the classes.dex (S16 ), check whether there is a required class file in classes.dex (S18), if there is, load it (S20), if not, return to S12, and repeat the above steps to find another JAR file. [0003] The linking process of ordinary classes in the Android system is as follows: figure 2 As shown, the loading and linking of all classes and interfaces on the Java class inheritance chain is recursive. At ...

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a method and a system for loading java classes on a virtual machine of the android system, and solves the delay problem of starting the Android system caused by the loading and linking of the Java classes initially started by the virtual machine of the android system

Images