com.numericalmethod.suanshu.number

Class Counter

java.lang.Object

com.numericalmethod.suanshu.number.Counter

All Implemented Interfaces:

java.io.Serializable

public class Counter
extends java.lang.Object
implements java.io.Serializable

A counter keeps track of the number of occurrences of numbers. Two numbers are considered the same if they are close enough by a user specified number of decimal points.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
Counter() Construct a counter with no rounding.
Counter(int scale) Construct a counter.

Method Summary

Modifier and Type	Method and Description
void	add(double... numbers) Add numbers to the counter.
void	add(double number) Add a number to the counter.
int	count(double number) Get the count, i.e., the number of occurrences, of a particular number.
java.util.Set<java.lang.Double>	keySet() Get the set of numbers the counter has seen.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Counter

public Counter()

Construct a counter with no rounding. Two numbers are considered the same if they have the same binary representations.

Counter

public Counter(int scale)

Construct a counter. Two numbers are considered the same if they are close enough by a number of decimal points.

Parameters:

scale - a precision in terms of the number of decimal points

Method Detail

add

public void add(double number)

Add a number to the counter.

Parameters:

number - a double

add

public void add(double... numbers)

Add numbers to the counter.

Parameters:

numbers - doubles

count

public int count(double number)

Get the count, i.e., the number of occurrences, of a particular number. If the counter has not seen the number before, it returns 0.

Parameters:

number - a number

Returns:

the count

keySet

public java.util.Set<java.lang.Double> keySet()

Get the set of numbers the counter has seen.

Returns:

a set of seen numbers