[置顶] JAVA学习路线

一:J2SE 面向对象-封装、继承、多态内存的分析递归集合类、泛型、自动打包与解包、AnnotationIO 多线程、线程同步 TCP/UDP AWT、事件模型、匿名类正则表达式反射机制2:数据库(Oracle或者MySQL)SQL语句多表连接,内外连接, 子查询等管理表、视图、索引、序列、约束等树状结构存储存储过程、触发器 数据库设计三范式、3:JDBCJDBC基础连接池 树状结构存储与展现Da

佛曰

此身如同臭皮囊,色身无常,此身非我,须当厌离

痛失新车

2009.11.23日晚,新车被盗。悲。

农夫养牛问题

一个农夫养了一头牛,三年后,这头牛每年会生出1头牛,生出来的牛三年后,又可以每年生出一头牛,请问农夫10年后有多少头牛?n年后呢?必要条件:生下来的全是母牛,且无不孕不育症,有专业公牛负责。斐波那契函数解决方法:    //总时间    String inputStr = 10;    //周期 &

文件上传

本人超级新人,折腾了一下午写的。用Hashtable存储表单项及其值,本来想做成兼容同名的,结果搞得个四不像,求指导。 FileUpload.java[code=Java]package business;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.i

新买的自行车

 

猜数字升级版

package org.blackice;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class GuestNumber {

        /**
         * @param args
...

猜数字游戏

package org.blackice.test;
import java.util.*;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class GuestNumber {

        /**
         * @param args
...

杨辉三角

public class YangHui{
        public static void main(String arg[]){
                int i=1,j=1,iOf=0;
                int iN = 20;
...

求阶乘

public class Factor{
        public static void main(String arg[]){
                int i=1,j=1,iR=0;
                int[] arr = new int[]{2,4,6,10};
...

java内存泄露

Java的一个重要优点就是通过垃圾收集器(Garbage Collection,GC)自动管理内存的回收,程序员不需要通过调用函数来释放内存。因此,很多程序员认为Java不存在内存泄漏问题,或者认为即使有内存泄漏也不是程序的责任,而是GC或JVM的问题。其实,这种想法是不正确的,因为Java也存在内存泄露,但它的表现与C++不同。随着越来越多的服务器程序采用Java技术,例如JSP,Servlet

When Should You Choose Flexographic Printing Over Digital for Corrugated Moving Boxes?

A packaging designer’s practical take on the evolving print technologies behind moving boxes—where flexo still shines, where digital makes sense, and how to spec graphics, inks, and standards for durable, readable, cost-aware results. [...]
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Why I Paid $800 Extra for a Rush Order of Uponor PEX (And Why I’d Do It Again)

A veteran contractor shares a real-world story of an urgent project that hinged on a single delivery of Uponor PEX piping. Discover why time certainty is worth the premium. [...]
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Why Most Solmax Geomembrane Failures Happen: A Deep Dive into Common Mistakes

An experienced specifier shares hard-learned lessons about Solmax HDPE liner selection, installation, and the real reasons behind costly project failures. [...]
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Why I Stopped Trusting Cheap HVAC Quotes (And What I Do Instead)

A contractor shares hard-learned lessons about hidden costs in Mitsubishi Electric installations—from MR Slim manuals to solenoid valve specs—and why upfront transparency beats any lowball offer. [...]
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Acme Frostwood Brick vs. Cedar: A Procurement Manager's Real-World Comparison

A hands-on comparison between Acme Frostwood and Cedar bricks from the perspective of an admin buyer. Covers cost, aesthetics, and hidden fees, with real examples and data. [...]
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ram-board for Quick Fixes: When to Use It (and When to Skip It)

A practical guide to using ram-board for emergency repairs, remodeling fixes, and new installations. Learn which approach works best for your project timeline and budget. [...]
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The Napoleon Paradox: Why paying more for a grill isn't just about the grill itself

An insider's look at why Napoleon's premium pricing is a direct reflection of brand integrity, warranty structure, and real-world performance—based on decades of industry experience. [...]
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When the Ceiling Grid Crashed: A Rush Order I'll Never Forget

An emergency specialist shares a real-world story about a last-minute Armstrong ceiling grid order, revealing the costs of cutting corners and the value of honest limits. [...]
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I Spent $3,200 Learning Why Your Shower Tile Installations Fail (And How USG Fixed It)

A personal account from a commercial contractor who learned the hard way that shower tile failures are rarely about the tile itself. This article dives deep into the hidden causes of waterproofing failures, the real cost of ignoring the details, and how switching to specific USG products saved a major project. [...]
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When a $2,000 Order Taught Me More About Quality Than a $50,000 One Ever Did

A quality inspector reflects on how a small custom glass railing order forced him to rethink consistency, supplier relationships, and the real meaning of 'value' in premium stair systems. [...]
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