Write a generic class Pair which has 2 type parameters, F and S, representing th

Question

Write a generic class Pair which has 2 type parameters, F and S, representing the type of the first and second elements of a pair respectively. Add get and set methods for the first and second elements of the pair. Override the toString() method to display the first and second values of the pair in a format of your choosing. Use the Pair class in a program that creates an ArrayList of 10 Pair objects containing values of your choosing. The program will then print the string representation of each Pair to System.out (i.e., use the toString() method).

Explanation / Answer

Ans:

// pair class

public class Pair< F, S >

{

//F

private F first;

// S

private S second;

// pair

public Pair( F element1, S element2)

{

// first

first= element1;

// second

second= element2;

}

//getFirst

public F getFirst()

{

// return

return first;

}

//second

public S getSecond()

{

return

return second

}

// setFirst

public void setFirst( F element1 )

{

// elemnt 1

first = element1 ;

// set second

} public void setSecond( S element2 )

{

// elmnt 2

second = element2 ;

}

}

driver program:

public class Driver

{

// main

public static void main( String args[] )

{

// pair,--4, first

Pair< Integer, String > numberPair = new Pair< Integer, String >( 4, "First");

// print

System.out.printf( "First pair: < %d, %s > ", numberPair.getFirst(), numberPair.getSecond() );

// setFirst(5)

numberPair.setFirst( 5 );

// secoind()

numberPair.setSecond( "Second" );

// prints op

System.out.printf( "Second pair: < %d, %s > ", numberPair.getFirst(), numberPair.getSecon());

}

}

// thank you//

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