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Bruce Eckel’s Thinking in Java Contents | Prev | Next JNI is a fairly rich programming interface that allows you to call native methods from a Java application. It was added in Java 1.1, maintaining a certain degree of compatibility with its Java 1.0 equivalent, the native method interface (NMI). NMI has design characteristics that […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next This appendix was contributed by and used with the permission of Andrea Provaglio ( www.AndreaProvaglio.com). The Java language and its standard API are rich enough to write full-fledged applications. But in some cases you must call non-Java code; for example, if you want to access […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next This program was modified from code originally created by Larry O’Brien, and is based on the “Boids” program created by Craig Reynolds in 1986 to demonstrate an aspect of complexity theory called “emergence.” The goal here is to produce a reasonably lifelike reproduction of flocking […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next This chapter includes a set of projects that build on the material presented in this book or otherwise didn’t fit in earlier chapters. Most of these projects are significantly more complex than the examples in the rest of the book, and they often demonstrate new […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next The socket is the software abstraction used to represent the “terminals” of a connection between two machines. For a given connection, there’s a socket on each machine, and you can imagine a hypothetical “cable” running between the two machines with each end of the “cable” […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next Chapter 11 introduced the Java 1.1 concept of reflection and used that feature to look up methods for a particular class – either the entire list of methods or a subset of those whose names match a keyword you provide. The magic of this is […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next It’s hard to believe that Java could possibly be as fast or faster than C++ . This assertion has yet to be proven to my satisfaction. However, I’ve begun to see that many of my doubts about speed come from early implementations that were not […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next Performance tools [1] MicroBenchmark running on Pentium Pro (200Mh), Netscape 3.0, JDK 1.1.4 (see reference [5] below). [2] Sun’s Java document page on the JDK Java interpreter http://java.sun.com/products/JDK/tools/win32/java.html [3] Vladimir Bulatov’s HyperProf http://www.physics.orst.edu/~bulatov/HyperProf [4] Greg White’s ProfileViewer http://www.inetmi.com/~gwhi/ProfileViewer/ProfileViewer.html Web sites [5] The premiere online references […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next Now that the critical region has been isolated, you can apply two types of optimizations: generic techniques and those specific to Java. Generic approaches An effective generic speedup is to redefine the program in a more practical way. For example, in Programming Pearls [14], Bentley […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next Three approaches to locating the performance-critical part of a program are: 1. Install your own instrumentation “Profile” code by inserting explicit timing: long start = System.currentTimeMillis(); // Operation to be timed goes here long time = System.currentTimeMillis() – start; Have an infrequently-used method print cumulative […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next You should address performance only after you have a correct and fully tested program: Measure the program’s performance under realistic conditions. If it meets your requirements, you are finished. If not, go to the next step. Find the most critical performance bottleneck. This might require […]

Bruce Eckel’s Thinking in Java Contents | Prev | Next If you come from a C or C++ background, you might be skeptical at first of Java’s power when it comes to handling text. Indeed, one drawback is that execution speed is slower and that could hinder some of your efforts. However, the tools (in […]