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		Jcat
    
		寵辱不驚，閑看庭前花開花落～～
	
    

    
    		
	

    

    


    
	
		
    
			


    
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				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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