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public class Pair<T1,T2> implements PairInterface<T1,T2>
{
// TO DO: Instance Variables
T1 one;
T2 two;
public Pair(T1 aFirst, T2 aSecond)
{
one = aFirst;
two = aSecond;
}
/**
* Gets the first element of this pair.
* @return the first element of this pair.
*/
public T1 fst()
{
return one;
}
/**
* Gets the second element of this pair.
* @return the second element of this pair.
*/
public T2 snd()
{
return two;
}
/**
* Sets the first element to aFirst.
* @param aFirst the new first element
*/
public void setFst(T1 aFirst)
{
one = aFirst;
}
/**
* Sets the second element to aSecond.
* @param aSecond the new second element
*/
public void setSnd(T2 aSecond)
{
two = aSecond;
}
/**
* Checks whether two pairs are equal. Note that the pair
* (a,b) is equal to the pair (x,y) if and only if a is
* equal to x and b is equal to y.
* @return true if this pair is equal to aPair. Otherwise
* return false.
*/
public boolean equals(Object otherObject)
{
if(otherObject == null)
{
return false;
}
if(getClass() != otherObject.getClass())
{
return false;
}
Pair pairObject = (Pair) otherObject;
return one.equals(pairObject.fst()) && two.equals(pairObject.snd());
}
/**
* Generates a string representing this pair. Note that
* the String representing the pair (x,y) is "(x,y)". There
* is no whitespace unless x or y or both contain whitespace
* themselves.
* @return a string representing this pair.
*/
public String toString()
{
return "(" + one.toString() + "," + two.toString() + ")";
}
}
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