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public interface PairInterface<T1,T2>
{
/**
* Gets the first element of this pair.
* @return the first element of this pair.
*/
public T1 fst();
/**
* Gets the second element of this pair.
* @return the second element of this pair.
*/
public T2 snd();
/**
* Sets the first element to aFirst.
* @param aFirst the new first element
*/
public void setFst(T1 aFirst);
/**
* Sets the second element to aSecond.
* @param aSecond the new second element
*/
public void setSnd(T2 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.
*
* Note that if you forget to implement this method, your
* compiler will not complain since your class inherits this
* method from the class Object.
*
* @return true if this pair is equal to aPair. Otherwise
* return false.
*/
public boolean equals(Object otherObject);
/**
* 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.
*
* Note that if you forget to implement this method, your
* compiler will not complain since your class inherits this
* method from the class Object.
*
* @return a string representing this pair.
*/
public String toString();
}
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