Collection learning notes and collection learning notes

Collection learning notes and collection learning notes

 

BinarySearch principle:

 

Public static index halfSearch (List <String> list, String key)

{

 
Int max, min, mid;
 
Max = list. size ()-1;
 
Min = 0;
 
While (min <= max)
 
{
 
Mid = (max + min)> 1;
 
String str = list. get (mid );
 
Int num = str. compareTo (key );
 
If (num> 0)
 
Max = mid-1;
 
Else if (num <0)
 
Min = min + 1;
 
Return min; // if it is Collections. binarySearch (), it is the location after min-(Access Point)-1
 
}

}

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Collections. fill (list, "pp ");

Replace all elements in the set with pp

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Collections. replaceAll (list, "oldValue", "newValue ");

Same:

List. set (index, "newValue ");

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Collections. reverse (list );

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Collections. swap (list, 1, 2); // badge 1, badge 2 swap

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Collections. shuffle (list); // random list

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What kind of software is good for taking study notes?

Both the Mind Map and Wiz are good. Wiz is suitable for web-based Mind Map, which requires a certain degree of knowledge. However, you will find it extremely useful.
 
Type of collection

Root Interface in Collection hierarchy
Collection represents a group of objects, also known as collection elements.
All common Collection implementation classes (usually indirectly implement Collection through a sub-interface) should provide two "standard" constructor Methods: one is void (No parameter) constructor, creates an empty collection. The other is a constructor with a Collection type single parameter. It is used to create a collection with the same elements as its parameters.