[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

The Real Cost of Your Washroom Dispenser: Why Unit Price is a Trap

A procurement manager breaks down the hidden costs in commercial washroom systems, from refill headaches to maintenance surprises, and explains why the cheapest dispenser often ends up costing you more. [...]
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When You Need Packaging Yesterday: The Rush Order Reality from Someone Who's Paid the Price

An emergency procurement specialist shares hard-won lessons on navigating rush packaging orders, explaining why certainty is worth the premium and how to avoid costly mistakes when time is short. [...]
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Why 'Just Get a Quote' Is the Worst Advice for Paper Procurement

A procurement manager with $180,000 in tracked spending argues that focusing on unit price is a trap. Real cost control means understanding total cost of ownership, hidden fees, and the true value of supplier relationships—especially with brands like French Paper. [...]
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FedEx Office for Rush Orders: When It Works, When It Doesn't, and How to Calculate the Real Cost

A practical guide from an operations specialist on using FedEx Office for emergency printing, based on 200+ rush jobs. Learn how to evaluate total cost, avoid hidden fees, and know when to look elsewhere. [...]
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EcoEnclose Reviews & Free Shipping: An Emergency Specialist's FAQ

A packaging procurement veteran answers the most urgent questions about EcoEnclose, from rush orders and free shipping to opening their mailers without a hitch. [...]
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The Real Cost of Business Printing: A Procurement Manager's 6-Step Checklist to Avoid Hidden Fees

Stop overpaying for business cards and flyers. A cost controller with 6 years of experience shares a practical checklist to compare quotes, spot hidden fees, and calculate the true total cost of your next print job. [...]
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The 7-Step Checklist I Use to Order Custom Labels (Without Getting Burned)

An office administrator shares a detailed, battle-tested checklist for ordering custom labels and placards, covering everything from verifying vendor invoicing to avoiding common compliance pitfalls. [...]
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Hallmark Labels, Promo Codes, and Coffee Bags: A Cost Controller's Guide to Smart B2B Spending

A procurement manager with 6 years of experience managing a $180,000 annual budget breaks down when to pay for premium (like Hallmark), when to chase discounts, and when the cheapest option is actually the smartest move. [...]
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Garment Bag vs. Poster Frame: Which One Actually Saves You Money (and Embarrassment)?

A procurement specialist with over $5,000 in documented mistakes breaks down the real cost of choosing the wrong packaging or display solution. Learn the hidden pitfalls of garment bags and poster frames to protect your budget and your reputation. [...]
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The Office Admin's Checklist for Switching to a New Facility Supplies Vendor (Without the Headaches)

A practical, step-by-step guide for office administrators and procurement managers on how to evaluate and transition to a new B2B supplier for packaging, janitorial, and paper products, based on real-world experience managing vendor relationships. [...]
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