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说明：  java mainshi baoduan gaojipian

j2ee struts + hibernate project

java基础习题 是java工程师初期的首选 是必备的习题库.我们每一个Java 都需要掌握这些基础知识(Java basic exercises)

spring demo as spring boot

楚列斯基分解 解方程组 数值计算 科学计算导论(Chu Lie Siji decomposition numerical solutions of equations Introduction to Scientific Computing)

AFD to Regular Expression

手机版画图工具，和电脑自带的画图工具部分功能一致，大家编程时可以多学习

说明：  控制条件语句的变量，在for循环结束后，就不可以被访问了，而while循环还可以访问，如果你继续想使用该变量，则可以使用while循环，否则推荐使用for循环，原因是for循环结束，该变量就从内存中消失，能够提高内存的使用效率。(The variable that controls the conditional statement is not accessible after the for loop has finished, and the while loop is accessible if you continue to use the variable, you can use the while loop. Otherwise, it is recommended to use the for loop, because the variable disappears from memory after the for loop, which can improve memory efficiency.)

用JAVA实现一般背包问题（附院码）比较实用(Knapsack problem)

TODO(code review): Curious question.. Why are a lot of these methods not declared as static, since they do not seem to require any local object state? Assumedly this cannot be changed without interfering with the API..