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boutiqueHow Java handles NPE issues gracefully
1. Foreword For Java developers, null is a troublesome type, and NPE can occur if you are not careful...
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boutiqueJava Development Tips: Reduce the Use of Magic Points
1. Preface When refactoring old code, I encountered similar writing:
public void attend(String value)...
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boutiqueSummary of core knowledge of java annotation
1. preface
A few years ago, our project was still running on structs 2, and once I asked a colleague if he knew
Spring...
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boutiqueSeveral ways to remove elements from Java Collection
1. The preface operation set is something Java programmers repeat almost every day. Today let's study...
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boutiqueUnder what circumstances cannot Java generics be used
1. Introduction Java 1.5 introduces generics to ensure type safety, prevent type conversion exceptions at run time, and allow classes to...
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boutiqueJava random number traps
preface
We should be familiar with random numbers. We use them to generate Captcha in business, or we have low requirements for repeatability...
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boutiqueFull analysis of Collectors in java8
1. The preface mentioned Collectors in an article about Collection removal elements yesterday. Believe a lot...
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boutiqueMerge operations for Java Stream streams
1. Introduction Java Stream Api provides many useful Apis that make it convenient for us to combine collections or multiple similar types...
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boutiqueWhen calculating in Java development, please be sure to use BigDecimal to calculate. BigDecimal summarizes and summarizes
Preface Today, a junior developer in the group asked why the tester tested that the price calculation module he wrote had calculation deviations...
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boutiqueGet file path in java
1. Introduction In Java development, we often need to obtain the path of a file, such as reading configuration files, etc. Today we will...
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boutiqueJava 9 to Java 17
Java 17 is one of the most important LTS releases of Java, but the direct transition from Java 8 to Java 17 is too long.
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boutiqueJava Collection Collation Interface Comparator
1. The preface recently used set sorting (based on Java 8). Now I use Stream whenever I can,...
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boutiqueResponsibility Chain Model of Design Model
preface
Many frameworks such as mybatis plug-ins, servlets filter, dubbo, security frameworks such as Spring sec...
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boutiqueJava rapid development QR code generation service
1. Preface I don't know when it started, but our lives were suddenly filled with QR codes, even the chickens of the ladies on the street...
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