Several important concepts introduced J2ME

J2ME platform has several important concepts, such as memory, CLDC, MIDP, etc.. J2ME beginners often these concepts are not thoroughly understood, or even bias. The purpose of this paper is related to the J2ME important concepts in the set.

1. Memory

We have been emphasizing the mobile information device memory is very small, should be double the value to use, but we know very little about the categorization of this memory, the following will be done in detail. In fact MIDP device memory is divided into three types, Programme Memory, Heap, persistent Storage.

Programme Memory is a mobile information device space allocated to the MIDlet suite, because the MIDlet suite jar file is released, so the file size can be considered Programme Memory size. Some manufacturers Programme Memory of the maximum value is limited, such as my Nokia 6108 the maximum value is 64k, more than words will not be installed. Reduce the size of MIDlet suite is very important, a convenient way is to use Obfuscator confusion on the application, this can reduce the size of jar file. In a future article I will cover how to use Proguard.

Heap is the application created during the operation of storing the object's storage space, local variables and member variables are also placed on the Heap, MIDP devices Heap space provided k about the dozens to hundreds of K.

Persistent Storage space is used to implement the MIDP application is persistent local data store, in the Record Management System from entry to the master of detail I did not like to say again here.

2. Connected Limited Device Configuration

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聽聽 3. Mobile Infomation Device Profile

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