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A Sampling of Methods Defined by Runtime (continued)

Let s look at two of the most common uses of the Runtime class: memory management and executing additional processes

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The joined tables create a logical table that has all the columns of both tables All the tasks performed on a single table (as covered previously in this chapter) can also be applied to joined tables Joining too many tables can cause performance degradation and bring response time to a crawl Typically, five is the maximum number of tables joined However, the actual number may vary depending on the DBMS, so consult with your database administrator or DBMS manufacturer for the maximum number of tables permitted to be joined using your DBMS Before you try examples in this section, you ll need to create a Customers table, ZipCode table, Store table, Products table, and Orders table These tables are defined below Insert the rows described in Table 11-5 through Table 11-9 into the appropriate tables before running code segments described in the following sections Define the Customers table as follows: CustNumber, number, primary key FirstName, VARCHAR, 50 LastName, VARCHAR, 50 Street, VARCHAR, 50 Zip, VARCHAR, 12

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Although Java provides automatic garbage collection, sometimes you will want to know how large the object heap is and how much of it is left You can use this information, for example, to check your code for efficiency or to approximate how many more objects of a certain type can be instantiated To obtain these values, use the totalMemory( ) and freeMemory( ) methods As mentioned in Part I, Java s garbage collector runs periodically to recycle unused objects However, sometimes you will want to collect discarded objects prior to the collector s next appointed rounds You can run the garbage collector on demand by calling the gc( ) method A good thing to try is to call gc( ) and then call freeMemory( ) to get a baseline memory usage Next, execute your code and call freeMemory( ) again to see how much memory it is allocating The following program illustrates this idea:

// Demonstrate totalMemory(), freeMemory() and gc() class MemoryDemo { public static void main(String args[]) { Runtime r = RuntimegetRuntime(); long mem1, mem2; Integer someints[] = new Integer[1000]; Systemoutprintln("Total memory is: " + rtotalMemory());

can attract visitors attention and present useful information You can obtain multimedia files from a variety of sources To use multimedia files ethically, always read and follow a Web site s usage rules Multimedia authoring tools help you integrate media components, such as video, audio, and animation, into a seamless whole To evaluate a multimedia site, determine whether the media elements support rather than distract from the site s goals, work properly and play for an appropriate length of time, and add to the viewer s enjoyment without creating clutter

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Part II:

mem1 = rfreeMemory(); Systemoutprintln("Initial free memory: " + mem1); rgc(); mem1 = rfreeMemory(); Systemoutprintln("Free memory after garbage collection: " + mem1); for(int i=0; i<1000; i++) someints[i] = new Integer(i); // allocate integers mem2 = rfreeMemory(); Systemoutprintln("Free memory after allocation: " + mem2); Systemoutprintln("Memory used by allocation: " + (mem1-mem2)); // discard Integers for(int i=0; i<1000; i++) someints[i] = null; rgc(); // request garbage collection mem2 = rfreeMemory(); Systemoutprintln("Free memory after collecting" + " discarded Integers: " + mem2); } }

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QR Code Scanner & Reader Control SDK for VB . NET | Decode QR ...
The VB . NET QR Code scanning decoder control component fast reads QR Code barcode images in .NET framework projects.

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