Archive

100 ways to do it wrong.

2021

February

February 24, 2021 » Python: asyncio
February 19, 2021 » Terminology Recap: Preemptive / Cooperative / Multitasking / Multithreading / Race Condition
February 11, 2021 » Python: super()
February 4, 2021 » Modulo / Congruence

January

January 27, 2021 » SICP: Recursion vs Iteration
January 3, 2021 » Single Dispatch in Java and Python

2020

December

December 30, 2020 » 《Python黑魔法手册》摘抄
December 5, 2020 » Variable / Bound Variable / Free Variable / Scope / Closure

August

August 3, 2020 » Comparing Time Complexity

May

May 26, 2020 » Subarray / Substring / Subsequence

April

April 27, 2020 » Permutation Groups / Permutation Notations / Order of A Permutation / Transpositions
April 23, 2020 » LeetCode: Stock Problems
April 22, 2020 » Python: enumerate()
April 1, 2020 » Python: Be cautious when using generators/iterators in nested loops

March

March 31, 2020 » Python: It's safe to slice a list with index out of range
March 23, 2020 » Python: calling static methods within the same class / recursive static methods

February

February 24, 2020 » Python: sorted() vs list.sort()
February 21, 2020 » LeetCode: Min Sub and Max Sub Problems
February 20, 2020 » Python: set / dict / Counter / OrderedDict / defaultdict
February 19, 2020 » Python: Quick Sort Revisited / Relation To BST / Lomuto Partition Scheme / Hoare Partition Scheme
February 18, 2020 » Python: Heaps
February 18, 2020 » Python: Heap Select / Quick Select
February 11, 2020 » Python: itertools.groupby() and pd.DataFrame.groupby() are different!
February 10, 2020 » Python: Vanilla $k$-way Merge Implementation & Lexical Order
February 6, 2020 » Python: and/or Operators on Objects

2019

December

December 24, 2019 » Python: Bitwise Inverse Operator vs Complements vs Nagatives

November

November 6, 2019 » What does effect size mean in GWAS?

June

June 21, 2019 » Cross Entropy vs Cross Entropy Loss
June 12, 2019 » Tensorflow 2.0 Autograph and Tracing: an example
June 12, 2019 » Python: Ellipsis (...) / Numpy: axis=-1 / np.newaxis
June 12, 2019 » Huber loss / np.where

May

May 20, 2019 » Convolution is convolution; it's NOT dot product

April

March

March 6, 2019 » Install Oracle JDK 8 and switch between JDKs in Ubuntu 18.04

February

February 26, 2019 » Terminology Recap: Sampling / Sample / Sample Space / Experiment / Statistical Model / Statistic / Estimator / Empirical Distribution / Resampling / CV / Jackknife / Bootstrap / Bagging / Likelihood / Estimation and Machine Learning
February 26, 2019 » Ring / Ring of sets
February 26, 2019 » Terminology Recap: Random Variable / Distribution / PMF / PDF / Independence / Marginal Distribution / Joint Distribution / Conditional Random Variable
February 15, 2019 » Pandas: one-column Boolean DataFrame vs Boolean Series
February 12, 2019 » Quick facts on SNAP / Node2vec cannot handle multi-graphs
February 6, 2019 » Python: pass-by-reference

January

January 22, 2019 » PCA: my interpretation
January 21, 2019 » Matrix Rank / Row Linear Dependence / λ = 0 / |A| = 0 / Size of Nullspace (Kernel)
January 15, 2019 » Terminology Recap: DNase / DHS / Dnase-seq
January 15, 2019 » Terminology Recap: ChIP / ChIP-on-chip (ChIP-chip) / ChIP-seq

2018

November

November 30, 2018 » R: Quasiquotation
November 30, 2018 » R: dive into types
November 29, 2018 » Digest of R for Data Science
November 7, 2018 » Terminology Recap: SNP / SNV / LD / GWAS / eQTL / DNA Microarray (DNA chip)
November 6, 2018 » Terminology Recap: Pre-transcriptional Gene Regulation / Transcription / Translation / mRNA / TF / TFBS / Promoter / Enhancer / Silencer / Insulator / Exon / Intron / Codon / Alternative Splicing / Gene Isoform / Protein Isoform / ORF
November 5, 2018 » Terminology Recap: Genome / Chromosome / Nucleosome / Chromatin / Chromatid / DNA / Double Strands / Coordinates System / Upstream & Downstream / TSS Distance
November 5, 2018 » Terminology Recap: Gene / Allele & Dominance & Zygosity / Haplotype / Genotype / Phenotype / Trait

October

October 24, 2018 » Promoter-Enhancer Interactions: Resources
October 23, 2018 » Alias Sampling
October 17, 2018 » Python: global declaration not needed in main
October 15, 2018 » Pandas: How to check if two DataFrames are equal
October 8, 2018 » Scaling / Normalization / Standardization
October 7, 2018 » Isometry
October 7, 2018 » Homeomorphism / Open Map / Close Map / Embedding
October 6, 2018 » Terminology Recap: Functions

September

September 26, 2018 » PyTorch: Computational Graphs
September 13, 2018 » SVD: Singular Value Decomposition
September 13, 2018 » Eigenbasis / Eigenspace
September 10, 2018 » Eigen-decomposition
September 6, 2018 » Hadamard Product / Diagonal Matrix / Orthogonal Matrix
September 4, 2018 » Tensor
September 1, 2018 » Minimum vs Minimal w.r.t. generalized inequality

August

August 30, 2018 » Linear Independence / Affine Independence / Non-singular Square Matrix / Definite Square Symmetric Matrix

July

July 26, 2018 » Digest of Terence Tao Analysis
July 24, 2018 » Infinite Cartesian Products
July 18, 2018 » Topology Induced by Metric / Equivalence of Metrics
July 16, 2018 » Topology / Topological Space / Redefine Neighborhood, Limit Point, Interior Point and Exterior Point

June

June 28, 2018 » Neighborhood / Open Set / Continuity / Limit Points / Closure / Interior / Exterior / Boundary
June 11, 2018 » Laplacian Matrix
June 11, 2018 » Divergence / Gradient / Laplace Operator
June 7, 2018 » Gradient Field
June 6, 2018 » Scalar Field / Vector Field
June 6, 2018 » Is vector space a field? And what are: Groups / Rings / Fields / Vector Spaces?
June 5, 2018 » Harmonic Function / Laplace's equation
June 5, 2018 » Closed-Form Solution
June 4, 2018 » Jekyll: Liquid cannot handle numeric tags
June 4, 2018 » G. Polya’s generalized problem solving approach

May

May 15, 2018 » RBF (Radial Basis Function) Kernel
May 15, 2018 » Hypothesis Space / Underfitting / Overfitting / Bias / Variance
May 9, 2018 » Radial Function / Radial Basis Function / Base / Exponent / Power
May 9, 2018 » Kernel in Linear Algebra / Inner Product Space / Hyperplane / SVM / Kernel Function / Normed vector space / Metric Space
May 4, 2018 » R: implicit return values / return value of an assignment

April

April 10, 2018 » Convex Functions / Jensen's Inequality / Jensen's Inequality on Expectations / Gibbs' Inequality / Entropy
April 5, 2018 » Expectation Maximization Algorithm Intuition
April 4, 2018 » Gradient and Directional Derivative
April 4, 2018 » Generative Models

March

March 22, 2018 » Python: Yes, you can unpack a generator!
March 22, 2018 » Python: Generator Expressions / joblib.Parallel
March 15, 2018 » PR Curve
March 15, 2018 » ggplot2: use geom_line() carefully when your x-axis data are descending

February

February 26, 2018 » ROC Curve: my interpretation
February 21, 2018 » Python: How to pip-install packages in virtualenv
February 2, 2018 » scikit-learn: init your estimator lightly and fit heavily

January

January 31, 2018 » scipy: pdist indexing
January 25, 2018 » scikit-learn: A walk through of GroupKFold.split()
January 23, 2018 » Pandas: split a DataFrame into chunks
January 23, 2018 » Check the header of Columbia Eigen tab delimited files

2017

December

December 24, 2017 » R: Graphics Tricks

November

November 8, 2017 » SQL: Autocommit does not guarantee immediate committing
November 8, 2017 » Python: pprint.pformat can be a good friend of __str__

October

October 5, 2017 » Digest of Essential SQLAlchemy
October 4, 2017 » Python: Use datatime instead of time for local clocks
October 4, 2017 » Python: Binary Search / Bisection / Binary Search Tree (BST)
October 4, 2017 » Python: __all__
October 4, 2017 » pdb: Your interactive python debugger

September

September 30, 2017 » Python: 3 ways to use metaclasses
September 28, 2017 » Python: Referencing and assignment in inner functions
September 28, 2017 » Python: for-else with break
September 28, 2017 » Python: Diamond Inheritance and super
September 28, 2017 » Python 3: Keyword-Only Arguments
September 25, 2017 » Pandas: Accessing the index of a row in an apply function
September 6, 2017 » SemiBoost
September 3, 2017 » Python GIL: Global Interpreter Lock

August

August 31, 2017 » Python: Put simply, generators are special coroutines
August 29, 2017 » Python: Yes, coroutines are complicated, but they can be used as simply as generators
August 29, 2017 » Python: IDLE won't display anything for an expression evaluated to None
August 28, 2017 » Python: raise / 3 key elements of an exception
August 28, 2017 » Python: except
August 25, 2017 » Python: with-statement / variable scope in with-statement
August 25, 2017 » Python: try-except-else-finally
August 18, 2017 » Python: Variable scope in if-statement
August 18, 2017 » Python: Query reference sequences using rpy2 and BSgenome
August 18, 2017 » Python: List multiplication is actually repetition
August 18, 2017 » Python: Iterating a file by every 2 lines
August 4, 2017 » Handy Python Profiler: line_profiler + kernprof
August 3, 2017 » Binary Encoding vs One hot Encoding

July

July 12, 2017 » Learn Design Patterns: Resources

April

April 12, 2017 » Digest of Information Theory, Inference, and Learning Algorithms

March

March 20, 2017 » CPU bound vs IO bound

February

February 5, 2017 » PWM (PSSM) / Sequence Logo

2016

November

November 17, 2016 » Digest of Essence of Linear Algebra

October

October 12, 2016 » Building GWAVA environment on Ubuntu 16.04

September

September 29, 2016 » Python: Zip
September 29, 2016 » Python: Signature
September 25, 2016 » Python: *expression
September 16, 2016 » Digest of Fluent Python
September 15, 2016 » scikit-learn: Pipeline
September 15, 2016 » Python: Mixin

August

August 23, 2016 » ML Terminology
August 3, 2016 » Python: MySQLdb

July

July 21, 2016 » How to rename MySQL databases or tables?
July 18, 2016 » Homology, Conserved Sequence and Conservation Scores
July 17, 2016 » Digest of Working Effectively with Legacy Code
July 13, 2016 » Python: sequences of booleans

June

June 29, 2016 » Linking, Loading and Library
June 22, 2016 » How to import data to MySQL? / How to change MySQL data directory?
June 17, 2016 » Applied Nonparametric and Modern Statistics
June 15, 2016 » Smoothing
June 14, 2016 » Digest of ggplot2

May

May 15, 2016 » Big-O vs Little-O notation

April

April 4, 2016 » Advanced Algorithms

March

March 30, 2016 » Computational Complexity Review

February

February 21, 2016 » MathJax 血泪史

January

January 9, 2016 » Basic Graph Algorithms
January 8, 2016 » Statistical Data Types

2015

December

December 16, 2015 » Lab Memo: Use Cases for Pipeline Refactoring

October

October 14, 2015 » Install Scientific Environment in Ubuntu 14.04 With Python 3.4

September

September 30, 2015 » Digest of Dive into Python 3
September 17, 2015 » Scripting Experience
September 8, 2015 » DSA setting at SSH client end
September 7, 2015 » What is the epigenome?

July

July 30, 2015 » Eukaryotic Cell Structure
July 29, 2015 » Cell Cycle
July 28, 2015 » Taxonomic Ranks
July 27, 2015 » Digest of Molecular Biology for Computer Scientists
July 22, 2015 » Rcpp: inline 生成的临时文件举例以及 exception 相关的宏
July 17, 2015 » Rcpp Hierarchy
July 8, 2015 » Digest of Advanced R (亟待更新)

June

June 20, 2015 » Parametric vs. non-parametric tests
June 20, 2015 » Parametric vs. non-parametric models
June 19, 2015 » t-tests introduction
June 16, 2015 » McNemar Test
June 9, 2015 » Shapiro-Wilk Test for Normality
June 9, 2015 » Fisher's Exact Test for Independence
June 9, 2015 » Chi-Square Test for Independence
June 6, 2015 » Digest of Seamless R and C++ Integration with Rcpp (待修改)
June 6, 2015 » Digest of R in Action

May

May 19, 2015 » Digest of Effective C++
May 18, 2015 » C++11: inline namespace
May 17, 2015 » C++: Standard Type Transformation Templates
May 17, 2015 » C++: noexcept
May 15, 2015 » C++: type conversion operator
May 15, 2015 » C++: override
May 15, 2015 » C++: final
May 13, 2015 » C++: The Rule of Three/Five
May 13, 2015 » C++: move constructor & move assignment operator / lvalue & rvalue / reference qualifier
May 7, 2015 » C++11 Smart Pointer: auto_ptr is deprecated. Use unique_ptr instead. Here also come shared_ptr and weak_ptr.
May 6, 2015 » C++11: bind1st() and bind2nd() are deprecated. Use bind() instead.
May 5, 2015 » C++ Lambda Expression
May 4, 2015 » C++ Primitive Built-in Types
May 3, 2015 » C++: 6 things you must know about functions
May 3, 2015 » C++: =default & =delete
May 2, 2015 » C++ range for: To get item by value or by reference?
May 2, 2015 » C++: initializer_list
May 1, 2015 » C++: typedef & alias declaration (using)
May 1, 2015 » C++ Type Specifiers: auto / decltype
May 1, 2015 » C++: constexpr

April

April 30, 2015 » C++: Specifiers / Literal Prefix & Suffix
April 30, 2015 » C++: Null Pointer
April 26, 2015 » C++: static inside functions
April 26, 2015 » C++ double dispatch: 函数参数并不支持多态
April 26, 2015 » C++: A quick view of design pattern
April 24, 2015 » C++: Virtual Inheritance
April 24, 2015 » C++: typeid
April 24, 2015 » C++: Interface Class
April 24, 2015 » C++: Generic Containers
April 22, 2015 » C++: Iterator Types
April 22, 2015 » C++: A quick view of STL algorithms
April 21, 2015 » C++: Generic Algorithm Examples
April 21, 2015 » C++: function object
April 20, 2015 » C++: Template Trait
April 17, 2015 » C++: typename & template
April 17, 2015 » C++: template specialization
April 15, 2015 » C++: operator void*
April 15, 2015 » C++: Introduction to iostream
April 14, 2015 » C++ String
April 13, 2015 » C++: Turning off asserts
April 13, 2015 » C++ Exception Handling / auto_ptr
April 12, 2015 » C++: local scope
April 11, 2015 » C++: Introduction to Templates
April 8, 2015 » C++: Inheritance / virtual
April 7, 2015 » C++: 在子类中 override 或 overload 父类方法会屏蔽对 overloaded 方法的访问. This is different from Java!
April 6, 2015 » C++: overloading new & delete
April 6, 2015 » C++: new T and new T() are different!
April 5, 2015 » C++: Automatic type conversion / explicit
April 4, 2015 » C++ overloading `operator=`: shallow copy vs. deep copy / reference counting / copy on write
April 4, 2015 » C++: Operator Overloading
April 3, 2015 » C++: Simple object assignment means copying. This is different from Java!
April 3, 2015 » C++: pointer to class members
April 3, 2015 » C++: Complex copy-construction & How to prevent copy-construction (thus preventing pass-by-value)
April 2, 2015 » C++: static member funcion
April 2, 2015 » C++: Rules of static member initialization
April 2, 2015 » C++: pointer reference
April 2, 2015 » C++: Copy-constructor & the return value on the stack

March

March 31, 2015 » C++: Namespace
March 30, 2015 » C++: inline function
March 29, 2015 » C++: const object / const member & const member function / mutable
March 28, 2015 » C++: Const Reference
March 26, 2015 » C++: Temporary Objects, are you Rvalues?
March 26, 2015 » C++: More on const
March 26, 2015 » C++: Const Pointer
March 24, 2015 » C++: union 也有春天
March 24, 2015 » C++: Overloading on return values is NOT allowed (neither in java)
March 24, 2015 » C++: new & delete
March 24, 2015 » C++: Default function arguments & Placeholder arguments
March 24, 2015 » C++: constructors and destructors
March 24, 2015 » C++: Aggregate initialization
March 22, 2015 » C++: friend
March 21, 2015 » C++: Using struct like a class / Nested struct / Global scope resolution inside struct
March 21, 2015 » C++: The multiple-declaration problem / Never put using in headers
March 20, 2015 » C++: Setting the debugging flags / assert
March 20, 2015 » C++: array in argument list
March 20, 2015 » C: Pointer Arithmetic
March 20, 2015 » C: function pointers
March 20, 2015 » C: Advanced Preprocessor Features
March 19, 2015 » C++: typedef sees int* and int& as new types
March 19, 2015 » C++: enum
March 19, 2015 » C: struct
March 18, 2015 » C++ Explicit Operators
March 18, 2015 » C++ explicit cast operator: static_cast / const_cast / reinterpret_cast / dynamic_cast
March 18, 2015 » C++: auto / register / static / const / volatile / linkage / scope
March 18, 2015 » C: sizeof is an operator
March 17, 2015 » C++: dereference
March 16, 2015 » C++: There are void pointers but no void references
March 16, 2015 » C++: pass-by-value / pass-by-pointer / pass-by-reference
March 16, 2015 » C++: A syntax constraint when defining variables in the statements of if, while and switch
March 15, 2015 » C++: declarations vs. definitions / extern
March 14, 2015 » C++: Including headers
March 13, 2015 » The compilation process

February

February 8, 2015 » R Dates
February 7, 2015 » R: Generating All Pairwise Combinations of Strings

January

January 30, 2015 » R %any% operator
January 30, 2015 » R: commandArgs(trailingOnly) and --args
January 16, 2015 » Introduction to Linear Discriminant Analysis
January 2, 2015 » The MEME algorithm

2014

December

December 29, 2014 » EM method for identifying motifs in unaligned biopolymer sequences
December 28, 2014 » Expectation-Maximization Algorithm
December 25, 2014 » Signal Peptide & Protein Targeting
December 25, 2014 » Naive Bayes classifier
December 22, 2014 » Ensemble Methods in Machine Learning
December 11, 2014 » Structured Output Support Vector Machines
December 10, 2014 » Soft Margin Intuition
December 6, 2014 » WD kernel with shifts
December 5, 2014 » Support Vector Machines and Kernels
December 4, 2014 » Lagrange duality
December 3, 2014 » Hidden Markov Models

October

October 19, 2014 » Simplex
October 17, 2014 » A Little on Topic Model
October 9, 2014 » ISL: Unsupervised Learning
October 8, 2014 » ISL: Support Vector Machines
October 6, 2014 » ISL: Tree Based Methods
October 5, 2014 » ISL: Moving Beyond Linearity
October 3, 2014 » ISL: Linear Model Selection and Regularization - Part 2
October 2, 2014 » Bayesian Interpretation for Ridge Regression and the Lasso + Exercise 7

September

September 29, 2014 » RSS, MSE, RMSE, RSE, TSS, R² and Adjusted R²
September 28, 2014 » ISL: Linear Model Selection and Regularization - Part 1
September 27, 2014 » ISL: Resampling Methods
September 25, 2014 » ISL: Classification
September 25, 2014 » ISL: Classification - Conceptual Exercises
September 21, 2014 » ISL: Linear Regression - Part 2
September 21, 2014 » ISL: Linear Regression - Part 1
September 20, 2014 » Statistic, Statistical Hypothesis Test(ing), Test Statistic, t-test and p-value
September 20, 2014 » ISL: Statistical Learning
September 18, 2014 » Equation Numbering and Referencing in MathJax
September 10, 2014 » Expectation Operator Rules, Covariance and Standard Error of the Mean
September 10, 2014 » Asymptotics: The Law of Large Numbers and The Central Limit Theorem
September 9, 2014 » R PCA Example
September 9, 2014 » Bernoulli vs Multinoulli (Categorical) vs Binomial vs Multinomial / Gaussian / Poisson Distributions
September 8, 2014 » Conditional Probability
September 7, 2014 » Probability
September 6, 2014 » Machine Learning: Dimensionality Reduction
September 6, 2014 » Covariance and Correlation
September 4, 2014 » Moment, Expectation, Variance, Skewness and Kurtosis

August

August 28, 2014 » R Exploratory Data Analysis: Air Pollution Case Study
August 12, 2014 » R: Saving, Loading and Removing in-memory Data
August 2, 2014 » R: Getting and Cleaning Data
August 1, 2014 » What are Confounding Factors and How do they Affect Studies?

July

July 31, 2014 » What are the differences among different study designs, and what are the relative advantages of each?
July 31, 2014 » An Example of Experimental Design
July 29, 2014 » Types of Data Science Questions
July 26, 2014 » R console theme
July 26, 2014 » Octave: fmincg and Anonymous Functions
July 8, 2014 » R Generating Random Numbers and Random Sampling
July 8, 2014 » R Debugging
July 6, 2014 » Derivative and Partial Derivative
July 5, 2014 » Slope, Intercept and Distance

June

June 29, 2014 » R profiling
June 27, 2014 » R <<- operator
June 27, 2014 » R apply family
June 24, 2014 » Digest of Agile Software Development: Principles, Patterns, and Practices
June 19, 2014 » R Scoping Rules
June 14, 2014 » R Data Types - Part 3: Missing Values, Data Frames & Names
June 14, 2014 » R Data Types - Part 2: Factors
June 14, 2014 » R Data Types - Part 1: Basis, Vectors, Matrices & Lists
June 4, 2014 » Digest of Effective Java
June 3, 2014 » 《分布式 Java 应用：基础与实践》第四章总结其二：并发工具类
June 3, 2014 » 《分布式 Java 应用：基础与实践》第四章总结其一：集合类
June 3, 2014 » 《分布式 Java 应用：基础与实践》第三章总结其一：理解 JVM（未完待续）
June 3, 2014 » 《分布式 Java 应用：基础与实践》第二章总结：SOA 扫盲
June 3, 2014 » 《分布式 Java 应用：基础与实践》第一章总结：分布式 Java 应用的系统间通信的种类

May

May 24, 2014 » 调教 GitHub Pages 与 jekyll bootstrap 时遇到的一些问题
May 20, 2014 » Algorithm Quizzes
May 18, 2014 » 局部内部类、匿名内部类对外部变量的访问权限 + 闭包

March

March 22, 2014 » goagent/server/uploader.bat 失败的解决办法

2013

October

October 12, 2013 » Ant target 的 unless 含义
October 12, 2013 » Unified EL implicit objects are vulnerable to XSS attack
October 12, 2013 » <%@ page contentType%> 注意事项两则
October 12, 2013 » Sqlmap Namespace
October 12, 2013 » Spring 小技巧
October 12, 2013 » SO_TIMEOUT and CONNECTION_TIMEOUT
October 12, 2013 » Service Locator Pattern
October 12, 2013 » MySQL dump, replace and insert-on-duplicate-update
October 12, 2013 » Locate Bugs by Replaying
October 12, 2013 » JSON conversion
October 12, 2013 » How to use @link, @see and @code in JavaDoc
October 12, 2013 » 自定义 ServletContextListener 的写法举例
October 12, 2013 » 直接访问测试机 ip 地址是无法获取 cookie 的
October 12, 2013 » a weird problem caused by encoding
October 11, 2013 » @Transactional throws "no matching editors or conversion strategy found"
October 11, 2013 » @Autowired not working 的问题
October 10, 2013 » ibatis 小问题集合
October 9, 2013 » JavaScript: window 注意事项
October 9, 2013 » JavaScript: sleep
October 9, 2013 » JavaScript: onclick 注意事项
October 9, 2013 » JavaScript: enable & disable
October 9, 2013 » JavaScript: ajax 注意事项
October 9, 2013 » 常见 HTTP Status Code 及场景
October 9, 2013 » IE 下的奇葩注意事项

September

September 1, 2013 » Three-way Handshake
September 1, 2013 » Subnet Mask
September 1, 2013 » GET 与 POST 的区别
September 1, 2013 » Network Protocols
September 1, 2013 » 一个 http 请求的详细过程

July

July 29, 2013 » Digest of Short introduction to log4j
July 22, 2013 » SimpleDateFormat 不是线程安全的
July 22, 2013 » primitive type 可以为 null
July 22, 2013 » ScheduledExecutorService.scheduleAtFixedRate() 注意事项两则

May

May 25, 2013 » 有关设计的一些事后诸葛亮
May 25, 2013 » 关于表字段数量与对象字段数量的思考
May 25, 2013 » 设计 Service 的一些经验
May 25, 2013 » 设计 PO 的一些经验
May 25, 2013 » 设计 Controller 的一些经验
May 25, 2013 » Deploy carefully!
May 25, 2013 » 2 most important questions when an old project is assigned to you
May 8, 2013 » Digest of Test Driven Development

April

April 18, 2013 » Every servlet, controller, service, DAO, etc is Singleton in a SpringMVC application context
April 16, 2013 » slab, page and chunk in memcached
April 9, 2013 » visibility symbol in UML

March

March 21, 2013 » JSP: use ${fn:escapeXml()} to escape double quotes

2012

November

November 14, 2012 » MySQL 使用和优化基础

August

August 15, 2012 » Digest of Mocks Aren't Stubs

June

June 4, 2012 » Velocity Config in Spring

May

May 25, 2012 » never fake a <input type=file>

2011

November

November 21, 2011 » struts2 interceptor config
November 1, 2011 » shallow copy v.s. deep clone

October

October 18, 2011 » 阻止 form submit 的方法
October 18, 2011 » <form><input name=?>
October 12, 2011 » url-patttern

September

September 2, 2011 » static 属性的注入必须使用非 static 的 setter

August

August 17, 2011 » "Could not resolve placeholder" 解决方案

July

July 11, 2011 » MySQL 5.5 版本下 my.ini 内 [mysqld] 项中不能再写 default-character-set=utf8

2010

October

October 10, 2010 » 有关 Java 的 main 方法
October 5, 2010 » Java 多线程：synchronized
October 4, 2010 » Java 多线程：Runnable 接口 v.s. Thread 类
October 4, 2010 » Java 多线程：终止线程的方法

September

September 1, 2010 » 多线程示意和 thread.join() 用法示意

August

August 28, 2010 » hibernate 延迟加载的错误
August 11, 2010 » Spring TestContext 测试框架中 @BeforeClass 方法无法使用 @ContextConfiguration 初始化的 bean
August 8, 2010 » callback 释义
August 2, 2010 » Spring AOP 学习（四）：简单 XML 配置
August 2, 2010 » Spring AOP 学习（三）：例子与基本概念

July

July 29, 2010 » jBPM-4.3 流程定义 zip 包中的所有文件都是资源
July 29, 2010 » jBPM-4.3 <process> 标签 name 属性中的短横线会变成下划线赋给 key 属性
July 29, 2010 » jBPM-4.3 中 deploymentId 和definitionId 应该是一对一的关系
July 28, 2010 » Spring AOP 学习（二）：动态代理
July 28, 2010 » Spring AOP 学习（一）：组合对比继承的优势
July 4, 2010 » Java 的值传递

May

May 27, 2010 » org.apache.cxf.interceptor.Fault: Could not send Message
May 5, 2010 » UML 类图之关联、聚合、组合、依赖

April

April 3, 2010 » Join

March

March 4, 2010 » Ant 中的 fork="true"
March 2, 2010 » Ant 路径之 **

February

February 23, 2010 » clover 测试 servlet，提示找不到类 com_cenqua_clover/CoverageRecorder 的解决方法

2009

December

December 26, 2009 » 简单 SQL 语句的逻辑顺序
December 25, 2009 » MySQL REGEXP
December 25, 2009 » Isolation
December 11, 2009 » Simple Form Handling Example
December 5, 2009 » Pointer Swizzling
December 4, 2009 » page（页面）
December 4, 2009 » Disk Drive（磁盘驱动器）

November

November 29, 2009 » Spring MVC example anatomy
November 17, 2009 » 依赖、依赖注入（DI）以及控制反转（IoC）
November 14, 2009 » jbpm 4.3 variable 的 name 和 mapped-name
November 1, 2009 » IR 经典模型之向量模型
November 1, 2009 » IR 经典模型之布尔模型

October

October 31, 2009 » 当接口方法有声明 throws Exception 时，实现方法可以选择不 throws
October 31, 2009 » a simple delegation example
October 25, 2009 » windows 下查看端口是否被占用的方法
October 25, 2009 » Ant 中 javac 假死的解决办法
October 25, 2009 » jBPM 4.3 自动保存 TaskInstance 至数据库的机制
October 3, 2009 » Tomcat 6.0 环境变量和 Tomcat Manager Account

September

September 4, 2009 » class loading: further discussion involving steps of instance creation

August

August 13, 2009 » the proxy parameter of the invoke() method
August 4, 2009 » throw 的屏蔽作用
August 4, 2009 » 涉及继承的异常声明及捕捉
August 3, 2009 » finally 总是会被执行

July

July 31, 2009 » first catch
July 30, 2009 » foreach 与 iterable
July 28, 2009 » Arrays.asList()

April

April 7, 2009 » proxy
April 7, 2009 » 关于继承的新认识：导出类调用基类方法其实是向上转型
April 7, 2009 » 对内部类的继承
April 5, 2009 » static inner class
April 5, 2009 » 局部内部类 (local inner class)
April 5, 2009 » 内部类：对外部类的访问及 .this 和 .new
April 5, 2009 » 匿名内部类 (anonymous inner class)：简化形式及自动向上转型
April 3, 2009 » entends interface
April 2, 2009 » interface
April 2, 2009 » 关于覆写方法的访问权限
April 2, 2009 » abstract

March

March 27, 2009 » warning: 在构造器中请谨慎使用被覆写方法
March 27, 2009 » 关于覆写方法的 return type
March 27, 2009 » 多态
March 27, 2009 » 有关向下转型的必要性和动态绑定的细节
March 25, 2009 » final
March 25, 2009 » class loading: an example
March 23, 2009 » private、package 权限字段不可继承 + 向上转型的新理解
March 23, 2009 » overload and override: 重载与覆写
March 19, 2009 » initializer
March 19, 2009 » 关于 class 和 class member 的访问权限
March 18, 2009 » static
March 18, 2009 » array reference and initialization

2008

September

September 1, 2008 » Java Identifier

June

June 18, 2008 » ARM7 学习笔记