Tutorial by Examples

The internet is packed with tips for performance improvement of Java programs. Perhaps the number one tip is awareness. That means: Identify possible performance problems and bottlenecks. Use analyzing and testing tools. Know good practices and bad practices. The first point should be done d...

In Java, it's too "easy" to create many String instances which are not needed. That and other reasons might cause your program to have lots of Strings that the GC is busy cleaning up. Some ways you might be creating String instances: myString += "foo"; Or worse, in a loop or...

Donald Knuth is often quoted as saying this: "Programmers waste enormous amounts of time thinking about, or worrying about, the speed of noncritical parts of their programs, and these attempts at efficiency actually have a strong negative impact when debugging and maintenance are considered....