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Don t Concatenate Strings
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Concatenating strings is another processing drain that can be avoided by designing an application to eliminate concatenations or at least reduce the number of concatenations to the minimum necessary to achieve the objective of the application Concatenation also increases the application s use of memory in addition to increasing the application s processing requirements, which becomes apparent by comparing processing a string with processing a concatenated string A string is an array of characters terminated by a NULL and stored sequentially in memory Let s assume the application wants to compare two strings, both of which are four characters and reside in memory The application instructs the small computing device to copy the first character of each string into the CPU for comparison This process continues until either the null character is reached or a letter pair is different The entire process might require ten reading instructions and five comparison instructions, depending on when a mismatch is discovered (see Figure 4-5)
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Figure 4-5
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Ten reading instructions and five comparison instructions are necessary to compare two strings
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However, additional processing steps are necessary if one of those strings is a concatenated string Let s divide the first string into two strings, as shown in Figure 4-6 The left string must be concatenated into the first string; afterwards, the first string and the target string are compared The concatenation process introduces six additional processing steps: three instructions to read each character of the second string and three more instructions to write those characters to the end of the first string Besides the increase in processing steps, concatenation also requires more memory than if the first string and second string did not have to be concatenated Notice in Figure 4-6 that the second string remains in memory after the strings have been concatenated Therefore, you can reduce processing time and memory usage by avoiding concatenating strings An alternative is to concatenate strings before the string is loaded into the small computing device If there is a need to concatenate strings, use a StringBuffer object This makes efficient use of memory when strings are appended to the buffer, although there is additional processing overhead
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Avoid Synchronization
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It is very common for developers to invoke one or multiple threads within an operation Invoking a thread is a way of sharing a routine among other operations For example, a sort routine can be shared simultaneously by multiple operations that must sort data Each operation invokes the sort routine independent of other operations, although the same code is being executed for all operations Deadlocks and other conflicts might arise when multiple operations use the same routine These problems are avoided by synchronizing the invocations of a thread, as you probably remember when you learned Java programming Always use a thread whenever an operation takes longer than a tenth of a second to run because a thread requires less overhead than non-thread invocation methods, and therefore you ll see a performance increase in your application
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J2ME BASICS
Figure 4-6
Concatenating strings requires processing and memory allocation not required if strings are concatenated before being loaded into the small computing device
Another way to increase performance is to avoid using synchronization where possible Synchronization requires additional processing steps that are not necessary when synchronization is deactivated However, you must consider the performance trade-off with possible conflicts among operations that use the same threaded routine As a general rule, avoid using synchronization unless there is a high likelihood that conflicts among operations will occur
Thread Group Class Workaround
A common way of reducing the overhead of starting a new thread is to create a group of thread objects that are assigned threads as needed by operations within an application Less processing is required to assign a thread to an existing thread object than to create a new thread object Grouping thread objects is made possible by the ThreadGroup class, but J2ME does not support this class You can work around it, however, by creating your own grouping using the Collection class You can store groups of thread objects in a collection and then use standard collection methods to start and stop threads in the collection and assign threads to particular thread objects within the collection
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