Code Tip

CleanCode.md

소프트웨어 개발 3대 원칙: KISS, YAGNI, DRY

1. KISS

   Keep It Simple Stupid!

2. YAGNI

   You Ain't Gonna Need It!

3. DRY

   Don't Repeat Yourself!

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Refactoring

[참고 서적] https://book.naver.com/bookdb/book_detail.nhn?bid=16311029

Details

Composiong Method

• Extract Method
• Inline Method
• Extract Variable (Introduce Variable)
• Inline Temp
• Replace Temp with Query (= Extract Method + Inline Temp)
• Split Temporary Variable
• Remove Assignments to Parameters
• Replace Method with Method Object
• Substitute Algorithm

Moving Features between Objects

• Move Method
• Move Field
• Extract Class
• Inline Class
• Hide Delegate
• Remove Middle Man
• Introduce Foreign Method
• Introduce Local Extension

Simplifying Conditional Expressions

• Consolidate Conditional Expression
• Consolidate Duplicate Conditional Fragments
• Decompose Conditional
• Replace Conditional with Polymorphism
• Remove Control Flag
• Replace Nested Conditional with Guard Clauses
• Introduce Null Object
• Introduce Assertion

Simpifying Method Calls

• Add Parameter
• Remove Parameter
• Rename Method
• Seperate Query from Modifier
• Parameterized Method
• Introduce Parameter Object
• Preserve Whole Object
• Remove Setting Method
• Replace Parameter with Explicit Methods
• Replace Parameter with Method Call
• Hide Method
• Replace Constructor with Factory Method
• Replace Error Code with Exception
• Replace Exception with Test

Dealing with Generalization

• Pull Up Field
• Pull Up Method
• Pull Up Constructor Body
• Push Down Field
• Push Down Method
• Extract SubClass
• Extract SuperClass
• Extract Interface
• Collapse Hierarchy
• Form Template Method
• Replace Inheritance with Delegation
• Replace Delegation with Inheritance

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ConcurrentModificationException

https://jy2694.tistory.com/16

Details

// ConcurrentModificationException Case
ArrayList<String> list = new ArrayList<String>();
for(String name : list){
    list.remove(name);
}

// Solution 1
ArrayList<String> list = new ArrayList<String>();
ArrayList<String> Remove = new ArrayList<String>();
for (String name : list) 
    Remove.add(name);
for (String name : Remove) 
    list.remove(name);

// Solution 2
ArrayList<String> list = new ArrayList<String>();
 
Iterator<String> iter = list.iterator();
while (iter.hasNext()) {
    String s = iter.next();
    iter.remove();
}