Exam 16: Collections,maps,and Iterators

The V parameter in a HashMap< K,V > may be any object,but the K parameter must be a String.

The number of entries that may be added to a HashMap< K,V > object is limited to what is specified as the initial capacity in the constructor for the HashMap< K,V > object.

Write a Java statement to resize the resulting vector in number 2 above to 100.

All of the following are members of Java's Collection class except:

Elements of a vector must be of a primitive type,such as int,double,or char.

A collection is a data structure for holding elements.

If you do not need efficient random access but need to efficiently move sequentially through the list,then use the _____________ class.

For-each loops can not be used with Collection classes.

If you want a class that implements the List interface and do not need any methods beyond those in the List interface,you can use the ____________ class.

To use Java's Vector class,you must import the ___________ package.

Compare and contrast vectors and arrays.

The interface SortedSet and the concrete class _________ is designed for implementations of the Set interface that provide for rapid retrieval of elements.

Classes that implement the Set interface allows duplicate elements to occur.

A ___________ is used to specify a wide range of parameters.

A ____________ is a data structure for holding elements.

The AbstractSequentialList class provides efficient implementation of sequentially moving through the list at the expense of having inefficient implementation of random access to elements.

All Collection classes are part of the java.util package.

< T > is a wildcard used to specify a wide range of parameters.

When an interface lists a method as "optional," you do not need to implement it when defining a class that implements the interface.

An Iterator is an object that allows your code to produce the elements in a vector or other container one after the other,exactly once.