Preface to Java classic examples

JDK 1.5 (code name "Tiger") is a major move of the Java camp. It introduces several major new features, such as simplifying the genericity of data structures, annotating the metadata of Java classes in a flexible and well-defined way, a new schema-based mechanism for reading data, and a new mechanism for formatting and printing. In addition, the new version includes many subtle but important changes that are necessary for Java developers. Although you want to understand these mechanisms at once, it will take some time to fully understand and master them.

I wrote in the postscript of the first edition: "writing this book is an unforgettable experience." When many critics and writers are showing off their honors, I am embarrassed by my mistakes and omissions in the first edition. So, in this version, I tried my best to correct it.

At the same time, I added some new examples and abandoned a few old ones. The biggest new part is Chapter 8, which mainly discusses generics and enumerations, and features that can provide more flexibility for containers such as Java collections. At present, JaVa already contains regular expression API. Therefore, in chapter 4, Apache's regular expression API is transformed into JDK 1.4 regular expression.