By Eric Gigu?re
An in-depth instructional on find out how to use Java 2 Micro version to application hand held devices
even supposing Java is among the hottest programming languages, it truly is too strong for use on instant, hand-held units just like the Palm hooked up Organizer. A miniature model of Java, referred to as Java 2 Micro version, has now been created by way of solar Microsystems to run in particular on those units. Written through software program developer Eric Giguere, this ebook presents an authoritative therapy of this new language. Readers will research what needs to be performed to make Java achievable on those units and what suggestions are required to write down courses that do not soak up an excessive amount of reminiscence or run down the device's batteries. The e-book additionally offers entire insurance of Java Micro variation, together with the profiles that outline the services on hand to varied devices.
CD-ROM contains approved models of the Java 2 Micro variation SDK, Waba, and Kaffe. Examples are only if run on a number of instant structures.
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Extra resources for Java 2 micro edition : professional developer's guide
Sample text
In general, the throughput of an occasionally connected device will exceed that of an always-available device. Basic serial communication is not fast (in the 19Kbps to 33Kbps range). Newer cradles that support the Universal Serial Bus (USB) standard can achieve faster speeds. Wireless radio communication is currently in the 4Kbps to 19Kbps range, although these limits are expanding. But none of these communication methods are currently as fast as the typical Ethernet connection that you will find on a desktop computer, although new 67957_Wiley_Giguere_CH01x 10/17/2000 4:49 PM Page 15 It Really Is a Small World After All 15 technologies such as Bluetooth will narrow the gap.
1, which we have abridged for readability by removing the wait methods. Notice how the methods implemented by the class are listed and followed by the code for each method. Native methods are not listed, of course, because there is no Java code associated with them. All of this information is extracted directly from the compiled class file—obviously a verbose format. 1 Sample output for javap. ) Java class files A virtual machine written according to the specifications in the JVMS must accept its input in a format referred to as the classfile format.
This difference is not huge, but for larger programs, it could make a noticeable difference in size. To alleviate this concern, the Java instruction set includes a number of short forms for commonly performed operations. A better compilation of the Java code would, in fact, be as follows: iconst_5 istore_0 iconst_3 istore_1 iload_0 iload_1 iadd istore_2 // // // // // // // // push constant value 5 on stack as int pop int value and store in first local variable push constant value 3 on stack as int pop int value and store in second local variable load int from first local variable and push on stack do the same for the second local variable pop top two ints from stack, add, and push result on stack pop int value and store in third local variable Instructions such as iload