摘要：罗山尼亚安全公司bitdefender表示，它发现已经出现了针对便携式设备操作系统windows ce的第一例病毒。 bitdefender声称，它已经发现微软面向智能电话和其他便携设备而设计的windows ce操作系统正受到“理论上证实”的病毒的威胁。据了解，病毒的作者使用着“ratter”这一笔名，是专门编写symbian os病毒的组织29......
摘要：在c#中应用mapobjects(渲染效果)
摘要：mapobjects c# 渲染 专题图
作者：杨雨田 blue_bat@126.com
以前用mapx，里面有专题图，挺好。经过几天的试验，我把mapobjects中的各种渲染效果（类似mapx专题图，但不一样）都试了试，下面附上源代码，如果那位有不懂的地方请自己琢磨，哈哈…
代码如下：
using s......
我与 Joshua Bloch 的 email 讨论(emails between Joshua Bloch and me)
here are some email between me and joshua bloch. i hope these email will do some help for you. these mail had been saved for some time. i think i can share them with you.
joshua bloch, a senior staff engineer at sun microsystems, inc. bloch, an architect in the core java platform group, designed and implemented the award-winning java collections framework, the java.math package, and has contributed to many other parts of the platform. the author of numerous articles and papers, bloch has also written a book, effective java programming language guide, which won the prestigious jolt award from software development magazine. bloch holds a ph.d. in computer science from carnegie-mellon university. 【程序编程相关:
从windows到linux —— 装l】
about joshua bloch, here is some information: 【推荐阅读:
探索网络专业书店的经营模式(原创)】
suggestion: 【扩展信息:
blog系统存在问题,】
these email discussed about the general contract when overriding equals and java interface version ploblem. these questions were mentioned in the book effective java programming language guide.
after i read effective java (by joshua bloch mailto:joshua.bloch@sun.com), i find some questions. here are my suggestion:
1. in item 7: obey the general contract when overriding equals
"it turns out that this is a fundamental problem of
equivalence relations in object-oriented languages. there is simply no way to
extend an instantiable class and add an aspect while preserving the equals
contract."
i think we can modify function point.equals to do this, make it return true only when two object have the same class type.
public class point extends point2d implements java.io.serializable {
//...
public boolean equals(object obj) {
if (obj == null) {
return false;
}
if (getclass().equals(obj.getclass()) == false) {
return false;
}
point pt = (point)obj;
return (x == pt.x) && (y == pt.y);
}
}
public class colorpoint extends point {
private color color;
public colorpoint(int x, int y, color color) {
super(x, y);
this.color = color;
}
public boolean equals(object o) {
if (obj == null) {
return false;
}
if (getclass().equals(obj.getclass()) == false) {
return false;
}
colorpoint cp = (colorpoint)o;
return super.equals(o) && cp.color == color;
}
}
there is no problem about symmetry or transitivity.
i suggest this should be a general rule for overwrite function equals().
2.in item 16: use interfaces insteadof abstract classes....
下一页 摘要：在论坛和生活中总是碰到不停的找java排序和查找算法的人，问哪里有源代码，呵呵。其实java本身给大家提供了一个很好的类，那就是arrays。arrays隶属书the collections framework。这个类提供了数组的填充，查找，比较，排序等一系列的对数组的操作。
一 填充：
arrays.fill(type[] a, type val)系列方法是给，数组填充。就是简单的把一个数......
