Ray's playground

摘要： The levels of access control from “most access” to “least access” are public, protected, package access (which has no keyword), and private. 阅读全文

摘要： Your application can store data using several different techniques dependingon the size of the data, its structure, its lifetime, and whether itwill be shared with other programs. In this chapter, we&... 阅读全文

摘要： Android supports the following file types (this is subject to change withnew releases):• WAV (PCM uncompressed)• AAC (Apple iPod format, unprotected)• MP3 (MPEG-3)• WMA (Window... 阅读全文

摘要： There are too many stuff in this chapter.I need to review the code later. 阅读全文

摘要： [代码] 阅读全文

摘要： [代码] 阅读全文

摘要： The default behavior of equals( ) is to compare references. So unless you override equals( ) in your new class you won’t get the desired behavior.　　Java programmers cannot implement their own ov... 阅读全文

摘要： It’s useful to visualize some aspects of how things are laid out while the program is running—in particular how memory is arranged. There are five different places to store data:　　1.Regist... 阅读全文

摘要： 1.Everything is an object. Think of an object as a fancy variable; it stores data, but you can “make requests” to that object, asking it to perform operations on itself. In theory, you can... 阅读全文

摘要： A layout is a container for one or more child objects and a behavior to position them on the screen within the rectangle of the parent object.　　Here is a list of the most common layouts provided by An... 阅读全文