triangle

说明：  黑灰化肥灰会挥发发灰黑讳为黑灰花会飞；灰黑化肥会会挥发发黑灰为讳飞花化为灰(Black grey chemical fertilizer ash will volatilize grey black taboo black grey flower will fly; grey black chemical fertilizer will volatilize black ash taboo fly ash)

miniQQ，课程设计项目。支持好友，黑名单，保存聊天记录(MiniQQ, curriculum design. In support of friends, black list, save chat logs)

Java教程，21天精通JAVA电子书，清晰版。(Java Tutorial, 21 days proficient JAVA books, clear version.)

JAVA中逐渐JTree实例在线，实例可能比较简单，但是很容易学习(JAVA-line gradually JTree instance, the instance may be simple, but very easy to learn)

修改实验7中定义的Rectangle类，使之拥有两个构造方法。其中一个是默认的，它使两点的坐标都为（0，0） 另一个带有4个参数，求出左上角和右下角点坐标为（2.1，3.2）、（5.2，6.3）的矩形的周长及面积，再利用带参数的构造方法创建Rectangle对象，求出左上角和右下角点坐标为（1，2）、（6.8，10.5）的矩形的周长及面积.(Modify the definition of experiment 7 Rectangle class, so that it has two constructors. One is the default, it makes two points of the coordinate of (0,0) the other with four parameters, find the upper left and lower right corner coordinates (2.1,3.2), (5.2,6.3) and perimeter and area of ​ ​ a rectangle, and then use a parameterized constructor method to create a Rectangle object, find the upper left and lower right corner coordinates (1,2), (6.8,10.5) rectangle of perimeter and area.)

说明：  java课件 我们老师用的 java课件 我们老师用的(Our teacher was using java courseware courseware our teacher was using java)

java编程思想源代码，本书17章，java经典图书(thinking java programming source code, the book chapter 17, java classic books)

java源代码,PDF文件分割与合并的源代码，相当好用(java source code, PDF files, split and merge source code, very easy to use)

自己写的二维条形码的读取和输出，即可以根据信息输出为二维码，也可以读出二维码的信息。是一个工程文件，用eclipse即可运行。(Write their own 2D bar code read and output according to the information output for the two-dimensional code can also read out the two-dimensional code information. Is a project file to run, with the eclipse.)

Java对象关系映射详解:Java object relational mapping Xiangjie(Java object-relational mapping Xiangjie: Java object relational mapping Xiangjie)