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Effective Java - Override clone() method judiciously

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Ferdous Mahmud Shaon
Ferdous Mahmud Shaon
EducaciónTecnologíaMeditación
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Effective Java - Item 10 ,[object Object],[object Object],[object Object],[object Object],[object Object]
Item 10: Override clone judiciously ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],assume: default constructor reads data from file Problem: breaks encapsulation!
[object Object],[object Object],[object Object],[object Object],[object Object]
Swimmer String name swimTime eventDate 26.31 Kristen Date year 2005 etc. 1982 Immutable mutable cu1 d
Aliasing problem ,[object Object],[object Object],[object Object],[object Object],[object Object]
protected Object clone () throws CloneNotSupportedException ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Object.clone() ,[object Object],[object Object]
Cloneable interface ,[object Object],[object Object],[object Object],[object Object]
Example: Class Die ( not implementing Cloneable ) ,[object Object],[object Object],[object Object],[object Object],[object Object],note the cast (since clone returns Object)
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],calls Object.clone() can’t happen, since Die is Cloneable
Cloning swimmer: ,[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cloning swimmers: ,[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],makes a bit-by-bit copy copies the Date
It is up to the class designer to determine whether: ,[object Object],[object Object],[object Object],[object Object],[object Object]
Case 1: shallow cloning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Case 2: deep cloning ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],fix the accessor by returning a copy
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Case 3: don’t use cloning ,[object Object],[object Object],[object Object]
Advantages over cloning… ,[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object]
Thank You

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Effective Java - Override clone() method judiciously

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