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Read source code is a good way to learn anything!

Experience
To know how dose List.remove(Object) work, I do many test sample. But I still feel not very realizing. Finally, I?took a look at?souce code, and then I knew everything!

public?boolean?remove(Object?o)?{

????if?(o?==?null)?{

????????????for?(int?index?=?0;?index?<?size;?index++)

????????if?(elementData[index]?==?null)?{

????????????fastRemove(index);

????????????return?true;

????????}

????}?else?{

????????for?(int?index?=?0;?index?<?size;?index++)

????????if?(o.equals(elementData[index]))?{

????????????fastRemove(index);

????????????return?true;

????????}

????return?false;

????}

1. List store very object's reference but object's own.
2. remove(Object) will remove the first reference in List which refer to?the object
3. If you want to change an object to a new index: back up it--> remove it--> re-add it

Experience
I create a class to handle something annotated by Annotations. But it doesn't work. I found out it is returned false by Class.getMethod().isAnnotationPresent(Todo.class). Finally, I got the reason by reading source code.

public?enum?RetentionPolicy?{
????/**
?????*?Annotations?are?to?be?discarded?by?the?compiler.
?????*/
????SOURCE,

????/**
?????*?Annotations?are?to?be?recorded?in?the?class?file?by?the?compiler
?????*?but?need?not?be?retained?by?the?VM?at?run?time.??This?is?the?default
?????*?behavior.
?????*/
????CLASS,

????/**
?????*?Annotations?are?to?be?recorded?in?the?class?file?by?the?compiler?and
?????*?retained?by?the?VM?at?run?time,?so?they?may?be?read?reflectively.
?????*
?????*?@see?java.lang.reflect.AnnotatedElement
?????*/
????RUNTIME
}

posted on 2006-08-03 18:43 Jcat 閱讀(351) 評論(0) 編輯收藏所屬分類: Java

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