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Pitfall: “overriding” private methods Here’s something you might innocently try to do: //: polymorphism/PrivateOverride.java // Trying to override a private method. package polymorphism; import

Creating regular expressions You can begin learning regular expressions with a subset of the possible constructs. A complete list of constructs for building regular expressions can be found in the JD

Summary Java provides a number of ways to hold objects: 1. An array associates numerical indexes to objects. It holds objects of a known type so that you don’t have to cast the result when you’re l

Pitfall: fields and static methods Once you learn about polymorphism, you can begin to think that everything happens polymorphically. However, only ordinary method calls can be polymorphic. For exa

To summarize the process of creating an object, consider a class called Dog: 1. Even though it doesn’t explicitly use the static keyword, the constructor is actually a static method. ...

前言         最近在看《Thinking In Java》，看到有关初始化顺序的时候有些迷茫，然后写了一个小示例程序求证了一下，如有不妥，请指出。

前言         最近在看Android源码，遇到了有关this的一个问题，自己写了一个测试小程序帮助理解。 代码 class AllBase { void func() { System.out.println("AllBase func"); } } class TestBase extends AllBase { private AllBase mOut

前言         最近在看Android源码的时候遇到了private类构造函数，于是写了一个测试小程序，帮助理解。 代码 class TestPrivate { private TestPrivate() { System.out.println("TestPrivate constructor"); } static TestPrivate mInstance;