Overview of Java Collections Framework API (UML diagram)

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Last Updated on 17 June 2019   |   Print  Email


The Java collections framework has a very complex API hierarchy.

The following class diagram shows a brief overview of the Java Collections Framework which is divided into four groups: List, Set, Map and Queue. Only the principal, commonly-used interfaces and classes are listed.

 

collections framework overview

 Class diagram of Java Collections framework

There are also more detailed class diagrams for each group:

 

Other Java Collections Tutorials: 


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Comments 

#4dfdkf2021-06-12 04:02
hello firends this is lund
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#3Gourav Choubey2016-08-31 07:34
we could have also defined method to compare objects of two subclasses as below

Boolean average(Statcomp arr) {
double sum = 0.0;
double sum1=0;
for(int i=0; i < nums.length; i++)
sum += nums.doubleValue();
for( int i=0; i < arr.nums.length; i++)
sum1 += arr.nums.doubleValue();
return (sum1==sum);
}
Then what is requirement of wildcard??
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#2Jacek Gzel2015-09-24 02:10
Hi,
TreeSet implements NavigableSet not extends.
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#1ade li2014-12-21 21:45
Hi,
I think AbstractSequentialList just extends AbstractList, and
LinkedList extends AbstractSequentialList and implements List
Quote