Tally

Class Tally

java.lang.Object
  Tally

This class represents a tally of integers, indexed from zero.

Field Summary
`static Tally`	`IMPOSSIBLE` Singleton constant representing an impossible tally.

Constructor Summary
`Tally(int n)` Constructs a tally of size n with all integers initialized to zero.
`Tally(int[] data)` Constructs a tally of size n from the given data, where n = data.length.

Method Summary
`Tally`	`add(Tally t)` Adds tally t to this tally, returning the "sum" as a new tally.
`boolean`	`equals(java.lang.Object t)` Returns true iff this tally is value-identical to t.
`int`	`getElement(int i)` Returns the int at position i.
`int`	`hashCode()` Returns the product of this tally’s elements as its hash code.
`boolean`	`isImpossible()` Returns whether the tally is impossible.
`int`	`length()` Returns the length (i.e., the number of elements) of this tally.
`void`	`setElement(int i, int j)` Sets the int at position i to value j.
`java.lang.String`	`toString()` Returns a string representation of this tally.
`int`	`total()` Returns the total of the elements in this tally.

Methods inherited from class java.lang.Object
`getClass, notify, notifyAll, wait, wait, wait`

Field Detail

public static final Tally IMPOSSIBLE

Singleton constant representing an impossible tally.

Constructor Detail

public Tally(int n)

Constructs a tally of size n with all integers initialized to zero.

public Tally(int[] data)

Constructs a tally of size n from the given data, where n = data.length.

Method Detail

public boolean isImpossible()

Returns whether the tally is impossible.

public void setElement(int i,
                       int j)

Sets the int at position i to value j.

Parameters:: i - the position of the int to set; j - the value to which the position should be set

public int getElement(int i)

Returns the int at position i.

public int length()

Returns the length (i.e., the number of elements) of this tally.

public int total()

Returns the total of the elements in this tally. For example, the 3-element tally (9, 3, 2) has a total of 14.

public Tally add(Tally t)

Adds tally t to this tally, returning the "sum" as a new tally.

public boolean equals(java.lang.Object t)

Returns true iff this tally is value-identical to t.

public int hashCode()

Returns the product of this tally’s elements as its hash code.

public java.lang.String toString()

Returns a string representation of this tally.